NEITHER  THIS  DEBENTURE  NOR  THE  SECURITIES  INTO  WHICH  THIS  DEBENTURE  IS
CONVERTIBLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE  COMMISSION OR
THE  SECURITIES  COMMISSION  OF ANY STATE.  THESE  SECURITIES  HAVE BEEN SOLD IN
RELIANCE UPON AN EXEMPTION FROM  REGISTRATION  UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "SECURITIES ACT"), AND, ACCORDINGLY,  MAY NOT BE OFFERED OR SOLD
EXCEPT PURSUANT TO AN EFFECTIVE  REGISTRATION STATEMENT UNDER THE SECURITIES ACT
OR PURSUANT TO AN AVAILABLE  EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO,
THE  REGISTRATION  REQUIREMENTS  OF THE  SECURITIES  ACT AND IN ACCORDANCE  WITH
APPLICABLE STATE SECURITIES LAWS.


                            GS CLEANTECH CORPORATION


               AMENDED AND RESTATED SECURED CONVERTIBLE DEBENTURE


Principal Amount: $2,084,986

Original Issuance Date:  February 8, 2006

Amended and Restated Debenture Issuance Date:              January 10, 2008

     FOR VALUE RECEIVED, GS CLEANTECH  CORPORATION,  a Delaware corporation (the
"Company"),  hereby promises to pay to the order of YA GLOBAL INVESTMENTS,  L.P.
or registered  assigns (the  "Holder") the amount set out above as the Principal
Amount  (as  reduced  pursuant  to the  terms  hereof  pursuant  to  redemption,
conversion or otherwise,  the  "Principal")  when due, whether upon the Maturity
Date (as defined below), on any Installment Date with respect to the Installment
Amount due on such  Installment  Date (each, as defined  herein),  acceleration,
redemption or otherwise  (in each case in accordance  with the terms hereof) and
to pay interest  ("Interest")  on any  outstanding  Principal at the  applicable
Interest Rate from the date set out above as the Amended and Restated  Debenture
Issuance  Date (the  "Issuance  Date")  until the same  becomes due and payable,
whether upon an Interest Date (as defined below),  any  Installment  Date or the
Maturity Date or acceleration, conversion, redemption or otherwise (in each case
in  accordance  with the  terms  hereof).  This  Amended  and  Restated  Secured
Convertible Debenture (including all debentures issued in exchange,  transfer or
replacement  hereof,  this  "Debenture") is issued pursuant to the Restructuring
Agreement  between  the  Holder  and the  Company  of even  date  herewith  (the
"Agreement")  amends,  supersedes,  modifies and completely restates the Secured
Convertible  Debenture,  dated  February  8,  2006  (the  "Existing  Debenture")
originally  issued by GreenShift to the Holder in the original  principal amount
of  $1,900,000  and assumed by the Company as of July 1, 2006 and  includes  the
original  principal  amount plus  accrued and unpaid  interest of $184,986 for a
total Principal amount of $2,084,986.  Certain capitalized terms used herein are
defined in Section 17.

(1) GENERAL TERMS

     (a)  Payment of Principal.  On each Installment Date, the Company shall pay
          to the Holder an amount  equal to the  Installment  Amount due on such
          Installment  Date in accordance  with Section 3. On the Maturity Date,
          the Company shall pay to the Holder an amount in cash representing all
          outstanding  Principal,  accrued and unpaid  Interest.  The  "Maturity
          Date" shall be December 31, 2011,  as may be extended at the option of
          the  Holder  (i) in the  event  that,  and for so long as, an Event of
          Default (as defined  below) shall have  occurred and be  continuing on
          the Maturity  Date (as may be extended  pursuant to this Section 1) or
          any event shall have  occurred and be  continuing on the Maturity Date
          (as may be extended  pursuant to this Section 1) that with the passage
          of time and the  failure to cure would  result in an Event of Default.
          Other than as specifically  permitted by this  Debenture,  the Company
          may not prepay or redeem  any  portion  of the  outstanding  Principal
          without the prior written consent of the Holder.

     (b)  Interest.  Interest shall accrue on the outstanding  principal balance
          hereof at an annual rate equal to ten percent (10%) ("Interest Rate").
          Interest  shall be  calculated  on the basis of a 365-day year and the
          actual number of days elapsed,  to the extent  permitted by applicable
          law. Interest  hereunder shall be paid on monthly in arrears beginning
          and on the first  Installment  Date and continuing  until the Maturity
          Date (or sooner as provided  herein) to the Holder or its  assignee in
          whose name this  Debenture is registered on the records of the Company
          regarding  registration  and  transfers of Debentures at the option of
          the Company in cash, or, provided that the Equity  Conditions are then
          satisfied  converted into Common Stock at the  Installment  Conversion
          Price on the Trading Day immediately prior to the date paid.

     (c)  Security.  The  Debenture  is  secured  by  a  pledge  of  assets  and
          guaranties  as set forth in the Security  Documents (as defined in the
          Agreement).

(2) EVENTS OF DEFAULT.

     (a)  An "Event of  Default",  wherever  used  herein,  means any one of the
          following  events  (whatever  the  reason  and  whether  it  shall  be
          voluntary or  involuntary  or effected by operation of law or pursuant
          to any judgment,  decree or order of any court, or any order,  rule or
          regulation of any administrative or governmental body):

          (i)  the  Company's  failure  to pay  to  the  Holder  any  amount  of
               Principal,  Interest, or other amounts when and as due under this
               Debenture (including,  without limitation,  the Company's failure
               to pay any redemption payments or amounts hereunder) or any other
               Transaction Document;

          (ii) The Company or any subsidiary of the Company shall  commence,  or
               there shall be commenced against the Company or any subsidiary of
               the Company under any applicable bankruptcy or insolvency laws as
               now or  hereafter  in effect  or any  successor  thereto,  or the
               Company or any  subsidiary  of the  Company  commences  any other
               proceeding under any reorganization,  arrangement,  adjustment of
               debt, relief of debtors,  dissolution,  insolvency or liquidation
               or similar law of any  jurisdiction  whether now or  hereafter in
               effect  relating to the Company or any  subsidiary of the Company
               or there is commenced  against the Company or any  subsidiary  of
               the Company any such  bankruptcy,  insolvency or other proceeding
               which remains undismissed for a period of 61 days; or the Company
               or any  subsidiary  of the Company is  adjudicated  insolvent  or
               bankrupt;  or any order of relief or other  order  approving  any
               such  case  or  proceeding  is  entered;  or the  Company  or any
               subsidiary  of  the  Company   suffers  any  appointment  of  any
               custodian, private or court appointed receiver or the like for it
               or  any   substantial   part  of  its  property  which  continues
               undischarged  or unstayed for a period of sixty one (61) days; or
               the  Company or any  subsidiary  of the  Company  makes a general
               assignment  for the benefit of  creditors;  or the Company or any
               subsidiary  of the Company shall fail to pay, or shall state that
               it is  unable  to pay,  or  shall be  unable  to pay,  its  debts
               generally as they become due; or the Company or any subsidiary of
               the Company shall call a meeting of its creditors  with a view to
               arranging  a  composition,  adjustment  or  restructuring  of its
               debts;  or the Company or any  subsidiary of the Company shall by
               any act or failure to act  expressly  indicate  its  consent  to,
               approval  of or  acquiescence  in any of  the  foregoing;  or any
               corporate  or  other  action  is  taken  by  the  Company  or any
               subsidiary of the Company for the purpose of effecting any of the
               foregoing;

          (iii) The Company or any  subsidiary  of the Company  shall default in
               any of its obligations under any other debenture or any mortgage,
               credit   agreement  or  other  facility,   indenture   agreement,
               factoring  agreement or other instrument under which there may be
               issued,  or by  which  there  may be  secured  or  evidenced  any
               indebtedness  for borrowed money or money due under any long term
               leasing or factoring arrangement of the Company or any subsidiary
               of the  Company in an amount  exceeding  $100,000,  whether  such
               indebtedness  now exists or shall  hereafter  be created and such
               default  shall  result  in such  indebtedness  becoming  or being
               declared due and payable;

          (iv) If the Common Stock is quoted or listed for trading on any of the
               following and it ceases to be so quoted or listed for trading and
               shall not again be quoted or listed for  trading  on any  Primary
               Market  within five (5) Trading Days of such  delisting:  (a) the
               American Stock  Exchange,  (b) New York Stock  Exchange,  (c) the
               Nasdaq Global Market,  (d) the Nasdaq Capital Market,  or (e) the
               Nasdaq OTC Bulletin Board ("OTCBB") (each, a "Primary Market");

          (v)  The Company or any  subsidiary of the Company shall be a party to
               any  Change of  Control  Transaction  (as  defined  in Section 6)
               unless in connection with such Change of Control Transaction this
               Debenture is retired;

          (vi) the  Company's  (A)  failure  to  cure a  Conversion  Failure  by
               delivery of the required  number of shares of Common Stock within
               five (5) Business Days after the applicable Conversion Failure or
               (B)  notice,  written or oral,  to any holder of the  Debentures,
               including  by way of public  announcement,  at any  time,  of its
               intention  not to comply  with a request  for  conversion  of any
               Debentures  into  shares  of Common  Stock  that is  tendered  in
               accordance  with the  provisions  of the  Debentures,  other than
               pursuant to Section 4(c);

          (vii) The Company  shall fail for any reason to deliver the payment in
               cash  pursuant to a Buy-In (as defined  herein)  within three (3)
               Business Days after such payment is due;

          (viii) The  Company  shall  fail  to  observe  or  perform  any  other
               covenant, agreement or warranty contained in, or otherwise commit
               any breach or default of any provision of this Debenture  (except
               as may be covered by Section 2(a)(i) through 2(a)(vii) hereof) or
               any Transaction  Document (as defined in Section 17) which is not
               cured within the time prescribed.

          (ix) any Event of Default (as defined in the Other Debentures)  occurs
               with respect to any Other Debentures.

     (b)  During the time that any portion of this Debenture is outstanding,  if
          any Event of Default has occurred, the full unpaid Principal amount of
          this  Debenture,  together  with  interest and other  amounts owing in
          respect  thereof,  to the date of  acceleration  shall  become  at the
          Holder's  election,  immediately  due and  payable  in cash;  provided
          however,  the Holder may  request  (but  shall have no  obligation  to
          request)  payment  of such  amounts  in Common  Stock of the  Company.
          Furthermore,  in addition to any other remedies, the Holder shall have
          the right (but not the  obligation)  to convert this  Debenture at any
          time  after (x) an Event of Default  or (y) the  Maturity  Date at the
          Installment  Conversion  Price.  The Holder  need not  provide and the
          Company hereby waives any presentment, demand, protest or other notice
          of any kind, (other than required notice of conversion) and the Holder
          may immediately and without expiration of any grace period enforce any
          and all of its rights and remedies  hereunder  and all other  remedies
          available  to  it  under  applicable  law.  Such  declaration  may  be
          rescinded  and  annulled  by  Holder  at any  time  prior  to  payment
          hereunder. No such rescission or annulment shall affect any subsequent
          Event of Default or impair any right consequent thereon.

(3) COMPANY INSTALLMENT REDEMPTION.

     (a)  General. On each applicable Installment Date, the Company shall pay to
          the Holder of this Debenture a minimum of the  Installment  Amount due
          on  such  date  by  redeeming  such  Installment  Amount  (a  "Company
          Redemption")  on  the  applicable  Installment  Date,  subject  to the
          provisions of this Section 3.

     (b)  Mechanics of Company  Redemption.  The Company shall pay to the Holder
          on each  Installment  Date, by wire transfer of immediately  available
          funds,  in an amount in cash  equal to such  Installment  Amount  plus
          accrued and unpaid Interest (the "Company Redemption Amount").  If the
          Company  fails  to  redeem  the  Company   Redemption  Amount  on  the
          applicable  Installment  Date,  then at the option of the Holder,  the
          Holder may convert all or any part of such Company  Redemption  Amount
          into shares of Common  Stock of the Company by dividing  such  Company
          Redemption   Amount  by  the  Installment   Conversion   Price.   Such
          Conversions  pursuant to this Section 3(b) shall be made in accordance
          with the provisions of Section 4(b). In the event the Holder elects to
          convert  all or any  portion of the  Company  Redemption  Amount,  the
          Company  Redemption  Amount so  converted  shall be deducted  from the
          Installment  Amounts relating to the applicable  Installment  Dates as
          set forth in the applicable Conversion Notice.  Without limitation and
          in  addition  to any other  rights of the  Holder,  any portion of the
          Installment  Amount that is not paid by the Company or converted  into
          Common  Stock  shall  accrue to,  and be paid on the next  Installment
          Date.

     (c)  Deferred  Installment  Amount.  Notwithstanding  any provision of this
          Section 3 to the  contrary,  the Holder  may, at its option and in its
          sole discretion,  deliver a written notice to the Company at least two
          (2) days prior to any Installment Date electing to have the payment of
          all or any  portion  of such  Installment  Amount  payable on the next
          Installment Date deferred to the Maturity Date. Any amount deferred to
          the Maturity  Date  pursuant to this  Section  3(d) shall  continue to
          accrue Interest through the Maturity Date.

     (d)  Company's Additional Cash Redemption.  The Company at its option shall
          have the  right to redeem  ("Optional  Redemption")  a portion  or all
          amounts   outstanding   under  this   Debenture  in  addition  to  any
          Installment  Amount prior to the Maturity Date provided that as of the
          date of the  Holder's  receipt  of a  Redemption  Notice  (as  defined
          herein) (i) the Closing Bid Price is less than the  Conversion  Price,
          and (ii) no Event of Default has  occurred.  The Company  shall pay an
          amount equal to the principal  amount being redeemed plus a redemption
          premium  ("Redemption  Premium") equal to fifteen percent (15%) of the
          Principal amount being redeemed,  and accrued Interest,  (collectively
          referred to as the "Company Additional  Redemption Amount").  In order
          to make a redemption pursuant to this Section, the Company shall first
          provide  written  notice  to the  Holder  of its  intention  to make a
          redemption  (the  "Redemption  Notice")  setting  forth the  amount of
          Principal it desires to redeem. After receipt of the Redemption Notice
          the Holder shall have three (3) Business  Days to elect to convert all
          or any portion of this Debenture, subject to the limitations set forth
          in Section 4(b). On the fourth (4th) Business Day after the Redemption
          Notice, the Company shall deliver to the Holder the Company Additional
          Redemption  Amount with respect to the Principal amount redeemed after
          giving effect to  conversions  effected  during the three (3) Business
          Day period.

(4) CONVERSION OF DEBENTURE. This Debenture shall be convertible into shares of
    the Company's Common Stock, on the terms and conditions set forth in this
    Section 4.

     (a)  Conversion  Right.  Subject to the  provisions of Section 4(c), at any
          time or times on or after  the  Issuance  Date,  the  Holder  shall be
          entitled  to  convert  any  portion  of  the  outstanding  and  unpaid
          Conversion Amount (as defined below) into fully paid and nonassessable
          shares  of  Common  Stock in  accordance  with  Section  4(b),  at the
          Conversion  Rate (as  defined  below).  The number of shares of Common
          Stock issuable upon  conversion of any Conversion  Amount  pursuant to
          this Section 4(a) shall be determined by dividing (x) such  Conversion
          Amount  by (y) the  Conversion  Price  (the  "Conversion  Rate").  The
          Company  shall not issue any  fraction of a share of Common Stock upon
          any  conversion.  If the  issuance  would  result in the issuance of a
          fraction  of a share of Common  Stock,  the  Company  shall round such
          fraction of a share of Common Stock up to the nearest whole share. The
          Company shall pay any and all  transfer,  stamp and similar taxes that
          may be payable  with  respect to the  issuance  and delivery of Common
          Stock upon conversion of any Conversion Amount.

          (i)  "Conversion  Amount"  means  the  portion  of the  Principal  and
               accrued  Interest to be  converted,  redeemed or  otherwise  with
               respect to which this determination is being made.

          (ii) "Conversion  Price" means,  as of any Conversion Date (as defined
               below) or other date of  determination,  $1.25, on a post Reverse
               Stock Split basis, subject to adjustment as provided herein.

     (b)  Mechanics of Conversion.

          (i)  Optional Conversion. To convert any Conversion Amount into shares
               of Common  Stock on any date (a  "Conversion  Date"),  the Holder
               shall (A)  transmit by  facsimile  (or  otherwise  deliver),  for
               receipt on or prior to 11:59 p.m., New York Time, on such date, a
               copy of an executed  notice of  conversion  in the form  attached
               hereto as Exhibit I (the "Conversion  Notice") to the Company and
               (B) if required by Section 4(b)(iv),  surrender this Debenture to
               a nationally  recognized  overnight delivery service for delivery
               to the  Company  (or an  indemnification  undertaking  reasonably
               satisfactory to the Company with respect to this Debenture in the
               case of its loss, theft or  destruction).  On or before the third
               Business Day following the date of receipt of a Conversion Notice
               (the "Share Delivery Date"), the Company shall (X) if legends are
               not  required  to be  placed  on  certificates  of  Common  Stock
               pursuant to the Securities  Purchase  Agreement and provided that
               the  Transfer  Agent is  participating  in the  Depository  Trust
               Company's  ("DTC") Fast Automated  Securities  Transfer  Program,
               credit such  aggregate  number of shares of Common Stock to which
               the Holder  shall be entitled to the  Holder's or its  designee's
               balance  account  with DTC through its Deposit  Withdrawal  Agent
               Commission   system  or  (Y)  if  the   Transfer   Agent  is  not
               participating  in the  DTC  Fast  Automated  Securities  Transfer
               Program,  issue and  deliver to the address as  specified  in the
               Conversion  Notice, a certificate,  registered in the name of the
               Holder or its designee,  for the number of shares of Common Stock
               to which the Holder shall be entitled  which  certificates  shall
               not bear any  restrictive  legends  unless  required  pursuant to
               Section  2(g)  of the  Securities  Purchase  Agreement.  If  this
               Debenture  is  physically  surrendered  for  conversion  and  the
               outstanding  Principal  of this  Debenture  is  greater  than the
               Principal portion of the Conversion Amount being converted,  then
               the Company  shall as soon as  practicable  and in no event later
               than three (3) Business Days after receipt of this  Debenture and
               at its  own  expense,  issue  and  deliver  to the  holder  a new
               Debenture  representing the outstanding  Principal not converted.
               The Person or Persons  entitled  to receive  the shares of Common
               Stock  issuable  upon a  conversion  of this  Debenture  shall be
               treated for all purposes as the record  holder or holders of such
               shares of Common  Stock  upon the  transmission  of a  Conversion
               Notice.

          (ii) Company's Failure to Timely Convert.  If within three (3) Trading
               Days  after the  Company's  receipt  of the  facsimile  copy of a
               Conversion  Notice the Company  shall fail to issue and deliver a
               certificate to the Holder or credit the Holder's  balance account
               with DTC for the  number of  shares of Common  Stock to which the
               Holder  is  entitled  upon  such   holder's   conversion  of  any
               Conversion  Amount (a "Conversion  Failure"),  and if on or after
               such  Trading  Day  the  Holder  purchases  (in  an  open  market
               transaction or otherwise) Common Stock to deliver in satisfaction
               of a sale by the  Holder  of  Common  Stock  issuable  upon  such
               conversion that the Holder anticipated receiving from the Company
               (a "Buy-In"),  then the Company shall,  within three (3) Business
               Days after the Holder's  request and in the Holder's  discretion,
               either  (i) pay  cash to the  Holder  in an  amount  equal to the
               Holder's total purchase price  (including  brokerage  commissions
               and  other  out of  pocket  expenses,  if any) for the  shares of
               Common Stock so purchased  (the "Buy-In  Price"),  at which point
               the  Company's  obligation  to deliver such  certificate  (and to
               issue such Common Stock) shall terminate,  or (ii) promptly honor
               its  obligation  to  deliver  to  the  Holder  a  certificate  or
               certificates  representing  such Common Stock and pay cash to the
               Holder in an amount  equal to the  excess  (if any) of the Buy-In
               Price  over the  product  of (A) such  number of shares of Common
               Stock, times (B) the Closing Bid Price on the Conversion Date.

          (iii) Book-Entry.  Notwithstanding  anything to the contrary set forth
               herein,  upon  conversion  of any  portion of this  Debenture  in
               accordance  with  the  terms  hereof,  the  Holder  shall  not be
               required to physically  surrender  this  Debenture to the Company
               unless  (A)  the  full  Conversion  Amount  represented  by  this
               Debenture  is being  converted or (B) the Holder has provided the
               Company with prior  written  notice (which notice may be included
               in a Conversion Notice)  requesting  reissuance of this Debenture
               upon  physical  surrender of this  Debenture.  The Holder and the
               Company shall maintain records showing the Principal and Interest
               converted  and the  dates of such  conversions  or shall use such
               other  method,  reasonably  satisfactory  to the  Holder  and the
               Company,  so  as  not  to  require  physical  surrender  of  this
               Debenture upon conversion.

     (c)  Limitations on Conversions.

          (i)  Beneficial   Ownership.   The   Company   shall  not  effect  any
               conversions  of this  Debenture and the Holder shall not have the
               right to convert any portion of this  Debenture or receive shares
               of Common  Stock as payment of interest  hereunder  to the extent
               that after giving  effect to such  conversion  or receipt of such
               interest  payment,  the  Holder,   together  with  any  affiliate
               thereof, would beneficially own (as determined in accordance with
               Section  13(d)  of the  Exchange  Act and the  rules  promulgated
               thereunder)  in excess of 4.99% of the number of shares of Common
               Stock  outstanding   immediately  after  giving  effect  to  such
               conversion or receipt of shares as payment of interest. Since the
               Holder will not be  obligated to report to the Company the number
               of shares of Common Stock it may hold at the time of a conversion
               hereunder,  unless the  conversion  at issue would  result in the
               issuance of shares of Common Stock in excess of 4.99% of the then
               outstanding  shares of Common Stock  without  regard to any other
               shares  which  may be  beneficially  owned  by the  Holder  or an
               affiliate  thereof,  the  Holder  shall  have the  authority  and
               obligation to determine whether the restriction contained in this
               Section will limit any particular conversion hereunder and to the
               extent that the Holder  determines that the limitation  contained
               in this Section  applies,  the  determination of which portion of
               the principal  amount of this Debenture is  convertible  shall be
               the  responsibility  and obligation of the Holder.  If the Holder
               has delivered a Conversion  Notice for a principal amount of this
               Debenture  that,  without  regard  to any other  shares  that the
               Holder or its  affiliates may  beneficially  own, would result in
               the issuance in excess of the  permitted  amount  hereunder,  the
               Company  shall notify the Holder of this fact and shall honor the
               conversion  for the  maximum  principal  amount  permitted  to be
               converted on such Conversion Date in accordance with Section 4(a)
               and, any principal  amount  tendered for  conversion in excess of
               the permitted  amount  hereunder shall remain  outstanding  under
               this Debenture. The provisions of this Section may be waived by a
               Holder (but only as to itself and not to any other  Holder)  upon
               not less than 65 days prior notice to the Company.  Other Holders
               shall be unaffected by any such waiver.

     (d)  Other Provisions.

          (i)  The Company shall at all times reserve and keep  available out of
               its  authorized  Common Stock the full number of shares of Common
               Stock issuable upon conversion of all  outstanding  amounts under
               this Debenture;  and within three (3) Business Days following the
               receipt by the  Company of a Holder's  notice  that such  minimum
               number of Underlying Shares is not so reserved, the Company shall
               promptly reserve a sufficient number of shares of Common Stock to
               comply with such requirement.

          (ii) All  calculations  under  this  Section 4 shall be rounded to the
               nearest $0.0001 or whole share.

          (iii) The Company covenants that it will at all times reserve and keep
               available  out of its  authorized  and unissued  shares of Common
               Stock solely for the purpose of issuance upon  conversion of this
               Debenture  and  payment of interest  on this  Debenture,  each as
               herein provided,  free from preemptive rights or any other actual
               contingent  purchase rights of persons other than the Holder, not
               less than such  number  of  shares of the  Common  Stock as shall
               (subject  to any  additional  requirements  of the  Company as to
               reservation  of such shares set forth in this Debenture or in the
               Transaction  Documents)  be  issuable  (taking  into  account the
               adjustments   and   restrictions   set  forth  herein)  upon  the
               conversion of the outstanding  principal amount of this Debenture
               and payment of interest hereunder. The Company covenants that all
               shares of Common  Stock that  shall be so  issuable  shall,  upon
               issue,  be duly and  validly  authorized,  issued and fully paid,
               nonassessable   and,  if  the  Underlying   Shares   Registration
               Statement has been declared  effective  under the Securities Act,
               registered  for public sale in  accordance  with such  Underlying
               Shares Registration Statement.

          (iv) Nothing  herein  shall  limit a Holder's  right to pursue  actual
               damages  or declare  an Event of  Default  pursuant  to Section 2
               herein  for  the  Company  's  failure  to  deliver  certificates
               representing  shares of Common Stock upon  conversion  within the
               period  specified  herein and such Holder shall have the right to
               pursue  all  remedies  available  to  it  at  law  or  in  equity
               including,  without limitation,  a decree of specific performance
               and/or injunctive relief, in each case without the need to post a
               bond or provide other  security.  The exercise of any such rights
               shall not  prohibit  the Holder from  seeking to enforce  damages
               pursuant to any other Section hereof or under applicable law.

(5) Adjustments to Conversion Price

     (a)  Adjustment of Conversion  Price upon Issuance of Common Stock.  If the
          Company,  at any time while this Debenture is  outstanding,  issues or
          sells,  or in  accordance  with  this  Section  5(a) is deemed to have
          issued or sold, any shares of Common Stock, excluding shares of Common
          Stock deemed to have been issued or sold by the Company in  connection
          with any Excluded Securities,  for a consideration per share (the "New
          Issuance  Price") less than a price equal to the  Conversion  Price in
          effect  immediately  prior  to such  issue  or sale  (such  price  the
          "Applicable  Price")  (the  foregoing  a  "Dilutive  Issuance"),  then
          immediately  after such Dilutive Issuance the Conversion Price then in
          effect shall be reduced to an amount equal to the New Issuance  Price.
          For purposes of determining the adjusted  Conversion  Price under this
          Section 5(a), the following shall be applicable:

          (i)  Issuance of Options. If the Company in any manner grants or sells
               any Options and the lowest price per share for which one share of
               Common Stock is issuable  upon the exercise of any such Option or
               upon  conversion  or  exchange  or  exercise  of any  Convertible
               Securities issuable upon exercise of such Option is less than the
               Applicable Price, then such share of Common Stock shall be deemed
               to be outstanding and to have been issued and sold by the Company
               at the time of the granting or sale of such Option for such price
               per share.  For purposes of this  Section,  the "lowest price per
               share for which one share of Common  Stock is  issuable  upon the
               exercise  of any such  Option or upon  conversion  or exchange or
               exercise of any Convertible  Securities issuable upon exercise of
               such Option"  shall be equal to the sum of the lowest  amounts of
               consideration (if any) received or receivable by the Company with
               respect to any one share of Common Stock upon granting or sale of
               the Option,  upon  exercise of the Option and upon  conversion or
               exchange or exercise of any  Convertible  Security  issuable upon
               exercise of such Option. No further  adjustment of the Conversion
               Price  shall be made upon the  actual  issuance  of such share of
               Common Stock or of such Convertible  Securities upon the exercise
               of such Options or upon the actual  issuance of such Common Stock
               upon  conversion  or exchange  or  exercise  of such  Convertible
               Securities.

          (ii) Issuance of Convertible Securities.  If the Company in any manner
               issues or sells any  Convertible  Securities and the lowest price
               per share for which one share of Common  Stock is  issuable  upon
               such conversion or exchange or exercise  thereof is less than the
               Applicable Price, then such share of Common Stock shall be deemed
               to be outstanding and to have been issued and sold by the Company
               at  the  time  of  the  issuance  or  sale  of  such  Convertible
               Securities  for such price per share.  For the  purposes  of this
               Section,  the  "lowest  price  per  share  for which one share of
               Common  Stock is  issuable  upon such  conversion  or exchange or
               exercise"  shall  be equal to the sum of the  lowest  amounts  of
               consideration (if any) received or receivable by the Company with
               respect  to any one share of Common  Stock upon the  issuance  or
               sale of the  Convertible  Security  and  upon the  conversion  or
               exchange  or exercise of such  Convertible  Security.  No further
               adjustment of the Conversion  Price shall be made upon the actual
               issuance  of such  share  of  Common  Stock  upon  conversion  or
               exchange or exercise of such Convertible  Securities,  and if any
               such issue or sale of such  Convertible  Securities  is made upon
               exercise of any Options for which  adjustment  of the  Conversion
               Price had been or are to be made pursuant to other  provisions of
               this Section, no further adjustment of the Conversion Price shall
               be made by reason of such issue or sale.

          (iii) Change in Option  Price or Rate of  Conversion.  If the purchase
               price provided for in any Options, the additional  consideration,
               if any, payable upon the issue, conversion,  exchange or exercise
               of  any  Convertible  Securities,   or  the  rate  at  which  any
               Convertible  Securities are  convertible  into or exchangeable or
               exercisable  for Common Stock changes at any time, the Conversion
               Price in effect at the time of such  change  shall be adjusted to
               the Conversion Price which would have been in effect at such time
               had such  Options or  Convertible  Securities  provided  for such
               changed  purchase  price,  additional  consideration  or  changed
               conversion  rate,  as the  case  may be,  at the  time  initially
               granted,  issued or sold.  For purposes of this  Section,  if the
               terms of any Option or Convertible  Security that was outstanding
               as of the  Issuance  Date are changed in the manner  described in
               the  immediately   preceding   sentence,   then  such  Option  or
               Convertible  Security and the Common Stock deemed  issuable  upon
               exercise,  conversion or exchange thereof shall be deemed to have
               been issued as of the date of such change. No adjustment shall be
               made  if such  adjustment  would  result  in an  increase  of the
               Conversion Price then in effect.

          (iv) Calculation  of  Consideration  Received.  In case any  Option is
               issued in connection  with the issue or sale of other  securities
               of the Company, together comprising one integrated transaction in
               which no specific  consideration  is allocated to such Options by
               the  parties  thereto,  the  Options  will be deemed to have been
               issued for the  difference of (x) the aggregate fair market value
               of such  Options  and  other  securities  issued  or sold in such
               integrated  transaction,  less (y) the fair  market  value of the
               securities  other  than  such  Option,  issued  or  sold  in such
               transaction  and  the  other  securities  issued  or sold in such
               integrated transaction will be deemed to have been issued or sold
               for the balance of the consideration  received by the Company. If
               any Common Stock, Options or Convertible Securities are issued or
               sold or  deemed  to  have  been  issued  or sold  for  cash,  the
               consideration  received  therefor  will be deemed to be the gross
               amount raised by the Company; provided,  however, that such gross
               amount is not greater than 110% of the net amount received by the
               Company  therefor.  If any Common Stock,  Options or  Convertible
               Securities  are  issued or sold for a  consideration  other  than
               cash, the amount of the consideration other than cash received by
               the Company will be the fair value of such consideration,  except
               where such  consideration  consists of securities,  in which case
               the amount of  consideration  received by the Company will be the
               Closing Bid Price of such  securities on the date of receipt.  If
               any Common Stock, Options or Convertible Securities are issued to
               the owners of the  non-surviving  entity in  connection  with any
               merger in which the Company is the surviving  entity,  the amount
               of consideration  therefor will be deemed to be the fair value of
               such portion of the net assets and business of the  non-surviving
               entity  as is  attributable  to such  Common  Stock,  Options  or
               Convertible Securities, as the case may be. The fair value of any
               consideration  other than cash or  securities  will be determined
               jointly by the Company and the Holder. If such parties are unable
               to reach  agreement  within ten (10) days after the occurrence of
               an event requiring  valuation (the "Valuation  Event"),  the fair
               value of such  consideration  will be determined  within five (5)
               Business  Days after the tenth (10th) day following the Valuation
               Event by an independent,  reputable appraiser jointly selected by
               the Company and the Holder.  The  determination of such appraiser
               shall be deemed  binding upon all parties  absent  manifest error
               and the fees and expenses of such appraiser shall be borne by the
               Company.

          (v)  Record  Date.  If the  Company  takes a record of the  holders of
               Common Stock for the purpose of  entitling  them (A) to receive a
               dividend or other distribution  payable in Common Stock,  Options
               or in Convertible  Securities or (B) to subscribe for or purchase
               Common Stock, Options or Convertible Securities, then such record
               date  will be  deemed  to be the date of the issue or sale of the
               Common  Stock  deemed  to  have  been  issued  or sold  upon  the
               declaration  of  such  dividend  or  the  making  of  such  other
               distribution  or the  date  of the  granting  of  such  right  of
               subscription or purchase, as the case may be.

     (b)  Adjustment of Conversion  Price upon  Subdivision  or  Combination  of
          Common  Stock.  If the  Company,  at any time while this  Debenture is
          outstanding,  shall  (a)  pay a stock  dividend  or  otherwise  make a
          distribution  or  distributions  on shares of its Common  Stock or any
          other  equity or equity  equivalent  securities  payable  in shares of
          Common Stock, (b) subdivide  outstanding shares of Common Stock into a
          larger  number of shares,  (c)  combine  (including  by way of reverse
          stock split)  outstanding shares of Common Stock into a smaller number
          of shares,  or (d) issue by  reclassification  of shares of the Common
          Stock any shares of capital stock of the Company,  then the Conversion
          Price shall be multiplied  by a fraction of which the numerator  shall
          be the number of shares of Common Stock (excluding treasury shares, if
          any) outstanding  before such event and of which the denominator shall
          be the number of shares of Common Stock  outstanding after such event.
          Any  adjustment  made pursuant to this Section shall become  effective
          immediately   after  the  record   date  for  the   determination   of
          stockholders  entitled to receive such  dividend or  distribution  and
          shall become  effective  immediately  after the effective  date in the
          case of a subdivision, combination or re-classification.

     (c)  Purchase  Rights.  If at any time the Company grants,  issues or sells
          any  Options,  Convertible  Securities  or rights to  purchase  stock,
          warrants,  securities or other property pro rata to the record holders
          of any class of Common Stock (the "Purchase Rights"),  then the Holder
          will be  entitled  to  acquire,  upon  the  terms  applicable  to such
          Purchase Rights,  the aggregate Purchase Rights which the Holder could
          have  acquired  if the  Holder had held the number of shares of Common
          Stock acquirable upon complete  conversion of this Debenture  (without
          taking  into  account  any   limitations   or   restrictions   on  the
          convertibility of this Debenture) immediately before the date on which
          a record is taken for the  grant,  issuance  or sale of such  Purchase
          Rights,  or,  if no such  record  is  taken,  the date as of which the
          record  holders of Common  Stock are to be  determined  for the grant,
          issue or sale of such Purchase Rights.

     (d)  Other  Events.  If any event  occurs of the type  contemplated  by the
          provisions  of this Section 4 but not  expressly  provided for by such
          provisions  (including,  without  limitation,  the  granting  of stock
          appreciation rights,  phantom stock rights or other rights with equity
          features),  then  the  Company's  Board  of  Directors  will  make  an
          appropriate  adjustment in the  Conversion  Price so as to protect the
          rights of the  Holder  under  this  Debenture;  provided  that no such
          adjustment will increase the Conversion Price as otherwise  determined
          pursuant to this Section 5.

     (e)  Other Corporate Events. In addition to and not in substitution for any
          other rights  hereunder,  prior to the consummation of any Fundamental
          Transaction  pursuant to which  holders of shares of Common  Stock are
          entitled to receive  securities  or other assets with respect to or in
          exchange for shares of Common Stock (a "Corporate Event"), the Company
          shall  make  appropriate  provision  to insure  that the  Holder  will
          thereafter  have  the  right  to  receive  upon a  conversion  of this
          Debenture,  at the Holder's  option,  (i) in addition to the shares of
          Common Stock receivable upon such conversion, such securities or other
          assets to which the Holder  would have been  entitled  with respect to
          such shares of Common  Stock had such shares of Common Stock been held
          by the Holder upon the  consummation  of such Corporate Event (without
          taking  into  account  any   limitations   or   restrictions   on  the
          convertibility  of this  Debenture)  or (ii) in lieu of the  shares of
          Common  Stock  otherwise   receivable  upon  such   conversion,   such
          securities or other assets received by the holders of shares of Common
          Stock in connection  with the  consummation of such Corporate Event in
          such  amounts as the Holder  would have been  entitled  to receive had
          this Debenture  initially been issued with  conversion  rights for the
          form of such consideration (as opposed to shares of Common Stock) at a
          conversion  rate  for  such   consideration   commensurate   with  the
          Conversion  Rate.  Provision  made pursuant to the preceding  sentence
          shall be in a form and substance satisfactory to the Required Holders.
          The  provisions of this Section  shall apply  similarly and equally to
          successive Corporate Events and shall be applied without regard to any
          limitations on the conversion or redemption of this Debenture.

     (f)  Whenever  the  Conversion  Price is  adjusted  pursuant  to  Section 5
          hereof, the Company shall promptly mail to the Holder a notice setting
          forth the Conversion  Price after such  adjustment and setting forth a
          brief statement of the facts requiring such adjustment.

     (g)  In case of any (1)  merger  or  consolidation  of the  Company  or any
          subsidiary of the Company with or into another Person,  or (2) sale by
          the Company or any  subsidiary of the Company of more than one-half of
          the assets of the Company in one or a series of related  transactions,
          a Holder shall have the right to (A) exercise any rights under Section
          2(b),  (B)  convert  the  aggregate  amount  of  this  Debenture  then
          outstanding  into the shares of stock and other  securities,  cash and
          property  receivable  upon or deemed to be held by  holders  of Common
          Stock  following such merger,  consolidation  or sale, and such Holder
          shall be  entitled  upon such  event or series  of  related  events to
          receive such amount of securities,  cash and property as the shares of
          Common  Stock  into  which  such  aggregate  principal  amount of this
          Debenture could have been converted  immediately prior to such merger,
          consolidation or sales would have been entitled, or (C) in the case of
          a merger or  consolidation,  require the surviving  entity to issue to
          the Holder a convertible  Debenture  with a principal  amount equal to
          the aggregate  principal  amount of this  Debenture  then held by such
          Holder,  plus all accrued and unpaid  interest and other amounts owing
          thereon,  which such newly  issued  convertible  Debenture  shall have
          terms identical (including with respect to conversion) to the terms of
          this  Debenture,  and  shall  be  entitled  to all of the  rights  and
          privileges  of the Holder of this  Debenture  set forth herein and the
          agreements  pursuant to which this Debentures were issued. In the case
          of clause (C), the  conversion  price  applicable for the newly issued
          shares of convertible preferred stock or convertible  Debentures shall
          be based upon the amount of  securities,  cash and property  that each
          share of  Common  Stock  would  receive  in such  transaction  and the
          Conversion Price in effect  immediately  prior to the effectiveness or
          closing date for such transaction.  The terms of any such merger, sale
          or  consolidation  shall  include such terms so as to continue to give
          the Holder the right to receive the securities,  cash and property set
          forth in this Section upon any conversion or redemption following such
          event. This provision shall similarly apply to successive such events.

(6) REISSUANCE OF THIS DEBENTURE.

     (a)  Transfer.  If this  Debenture is to be  transferred,  the Holder shall
          surrender this  Debenture to the Company,  whereupon the Company will,
          subject  to  the  satisfaction  of  the  transfer  provisions  of  the
          Securities  Purchase  Agreement,  forthwith issue and deliver upon the
          order of the Holder a new Debenture (in accordance with Section 6(d)),
          registered  in the  name of the  registered  transferee  or  assignee,
          representing the outstanding Principal being transferred by the Holder
          and,  if  less  then  the  entire   outstanding   Principal  is  being
          transferred,  a new Debenture (in accordance with Section 6(d)) to the
          Holder  representing the outstanding  Principal not being transferred.
          The  Holder  and  any  assignee,  by  acceptance  of  this  Debenture,
          acknowledge  and agree that,  by reason of the  provisions  of Section
          4(b)(iii)  following  conversion  or redemption of any portion of this
          Debenture, the outstanding Principal represented by this Debenture may
          be less than the Principal stated on the face of this Debenture.

     (b)  Lost,  Stolen or Mutilated  Debenture.  Upon receipt by the Company of
          evidence  reasonably  satisfactory to the Company of the loss,  theft,
          destruction or mutilation of this Debenture, and, in the case of loss,
          theft or destruction, of any indemnification undertaking by the Holder
          to the Company in customary form and, in the case of mutilation,  upon
          surrender  and  cancellation  of this  Debenture,  the  Company  shall
          execute and deliver to the Holder a new Debenture (in accordance  with
          Section 6(d)) representing the outstanding Principal.

     (c)  Debenture Exchangeable for Different Denominations.  This Debenture is
          exchangeable, upon the surrender hereof by the Holder at the principal
          office  of  the  Company,  for  a  new  Debenture  or  Debentures  (in
          accordance  with  Section  6(d))  representing  in the  aggregate  the
          outstanding  Principal of this Debenture,  and each such new Debenture
          will  represent  such  portion  of such  outstanding  Principal  as is
          designated by the Holder at the time of such surrender.

     (d)  Issuance of New Debentures.  Whenever the Company is required to issue
          a new  Debenture  pursuant  to the terms of this  Debenture,  such new
          Debenture (i) shall be of like tenor with this  Debenture,  (ii) shall
          represent,  as  indicated  on the  face of  such  new  Debenture,  the
          Principal  remaining  outstanding  (or in the case of a new  Debenture
          being issued  pursuant to Section 6(a) or Section 6(c),  the Principal
          designated  by  the  Holder   which,   when  added  to  the  principal
          represented by the other new Debentures issued in connection with such
          issuance,  does not exceed the Principal  remaining  outstanding under
          this Debenture  immediately prior to such issuance of new Debentures),
          (iii) shall have an issuance  date,  as  indicated on the face of such
          new  Debenture,  which  is the  same  as the  Issuance  Date  of  this
          Debenture,  (iv) shall have the same  rights  and  conditions  as this
          Debenture,  and (v) shall  represent  accrued and unpaid Interest from
          the Issuance Date.

(7)  NOTICES. Any notices, consents, waivers or other communications required or
     permitted to be given under the terms hereof must be in writing and will be
     deemed to have been delivered: (i) upon receipt, when delivered personally;
     (ii)  upon  receipt,  when  sent by  facsimile  (provided  confirmation  of
     transmission is mechanically or  electronically  generated and kept on file
     by the sending  party);  or (iii) one (1) Trading Day after  deposit with a
     nationally  recognized  overnight  delivery service,  in each case properly
     addressed to the party to receive the same.  The  addresses  and  facsimile
     numbers for such communications shall be:


If to the Company, to:             GS CleanTech Corporation
                                   One Penn Plaza, Suite 1612
                                   New York, New York 10119
                                   Attn: Kevin Kreisler. Chief Executive Officer
                                   Telephone:  (212) 994-5374
                                   Facsimile:  (646) 572-6336

If to the Holder:                  YA Global Investments, LP
                                   101 Hudson Street, Suite 3700
                                   Jersey City, NJ  07303
                                   Attention: Mark Angelo
                                   Telephone: (201) 985-8300

With a copy to:                    Troy Rillo, Esq.
                                   101 Hudson Street - Suite 3700
                                   Jersey City, NJ 07302
                                   Telephone: (201) 985-8300
                                   Facsimile: (201) 985-8266


          or at  such  other  address  and/or  facsimile  number  and/or  to the
     attention  of such other  person as the  recipient  party has  specified by
     written  notice given to each other party three (3) Business  Days prior to
     the effectiveness of such change. Written confirmation of receipt (i) given
     by the recipient of such notice,  consent,  waiver or other  communication,
     (ii)  mechanically or  electronically  generated by the sender's  facsimile
     machine containing the time, date,  recipient facsimile number and an image
     of the first page of such  transmission  or (iii)  provided by a nationally
     recognized  overnight  delivery  service,  shall be rebuttable  evidence of
     personal  service,  receipt  by  facsimile  or  receipt  from a  nationally
     recognized  overnight  delivery service in accordance with clause (i), (ii)
     or (iii) above, respectively.

(8)  Except as expressly  provided herein,  no provision of this Debenture shall
     alter or impair the  obligations  of the  Company,  which are  absolute and
     unconditional, to pay the principal of, interest and other charges (if any)
     on,  this  Debenture  at the  time,  place,  and  rate,  and in the coin or
     currency,  herein prescribed.  This Debenture is a direct obligation of the
     Company.  As long as this Debenture is  outstanding,  the Company shall not
     and shall  cause  their  subsidiaries  not to,  without  the consent of the
     Holder, (i) amend its certificate of incorporation, bylaws or other charter
     documents so as to adversely  affect any rights of the Holder;  (ii) repay,
     repurchase or offer to repay, repurchase or otherwise acquire shares of its
     Common Stock or other  equity  securities  other than as to the  Underlying
     Shares to the extent permitted or required under the Transaction Documents;
     or (iii) enter into any agreement with respect to any of the foregoing.

(9)  This  Debenture  shall not  entitle  the  Holder to any of the  rights of a
     stockholder  of the Company,  including  without  limitation,  the right to
     vote,  to receive  dividends  and other  distributions,  or to receive  any
     notice of, or to attend,  meetings of stockholders or any other proceedings
     of the Company,  unless and to the extent  converted  into shares of Common
     Stock in accordance with the terms hereof.

(10) No  indebtedness  of the  Company is senior to this  Debenture  in right of
     payment,  whether with respect to interest,  damages or upon liquidation or
     dissolution or otherwise.  Without the Holder's  consent,  the Company will
     not  and  will  not  permit  any of  their  subsidiaries  to,  directly  or
     indirectly,  enter  into,  create,  incur,  assume  or  suffer to exist any
     indebtedness  of any kind,  on or with  respect to any of its  property  or
     assets  now owned or  hereafter  acquired  or any  interest  therein or any
     income  or  profits  there  from  that  is  senior  in any  respect  to the
     obligations of the Company under this Debenture.

(11) This  Debenture  shall be governed by and construed in accordance  with the
     laws of the State of New Jersey, without giving effect to conflicts of laws
     thereof.  Each of the parties  consents to the jurisdiction of the Superior
     Courts of the State of New Jersey sitting in Hudson County,  New Jersey and
     the U.S.  District  Court for the District of New Jersey sitting in Newark,
     New Jersey in connection  with any dispute arising under this Debenture and
     hereby  waives,  to the maximum  extent  permitted by law,  any  objection,
     including  any objection  based on forum non  conveniens to the bringing of
     any such proceeding in such jurisdictions.

(12) If the Company fails to strictly  comply with the terms of this  Debenture,
     then the Company shall  reimburse the Holder  promptly for all fees,  costs
     and expenses,  including, without limitation,  attorneys' fees and expenses
     incurred  by the Holder in any action in  connection  with this  Debenture,
     including,  without  limitation,  those  incurred:  (i) during any workout,
     attempted workout,  and/or in connection with the rendering of legal advice
     as to the Holder's rights,  remedies and  obligations,  (ii) collecting any
     sums which become due to the Holder,  (iii)  defending or  prosecuting  any
     proceeding or any  counterclaim  to any  proceeding or appeal;  or (iv) the
     protection,  preservation  or  enforcement of any rights or remedies of the
     Holder.

(13) Any waiver by the  Holder of a breach of any  provision  of this  Debenture
     shall not operate as or be  construed to be a waiver of any other breach of
     such provision or of any breach of any other  provision of this  Debenture.
     The failure of the Holder to insist upon  strict  adherence  to any term of
     this Debenture on one or more occasions shall not be considered a waiver or
     deprive that party of the right  thereafter to insist upon strict adherence
     to that term or any other term of this  Debenture.  Any  waiver  must be in
     writing.

(14) If any provision of this  Debenture is invalid,  illegal or  unenforceable,
     the balance of this Debenture shall remain in effect,  and if any provision
     is inapplicable to any person or circumstance, it shall nevertheless remain
     applicable  to all other  persons and  circumstances.  If it shall be found
     that any  interest or other amount  deemed  interest  due  hereunder  shall
     violate  applicable laws governing  usury,  the applicable rate of interest
     due hereunder shall automatically be lowered to equal the maximum permitted
     rate of interest. The Company covenants (to the extent that it may lawfully
     do so) that it shall not at any time insist upon,  plead,  or in any manner
     whatsoever  claim or take the benefit or advantage of, any stay,  extension
     or usury law or other law which would  prohibit or forgive the Company from
     paying all or any portion of the principal of or interest on this Debenture
     as contemplated  herein,  wherever enacted, now or at any time hereafter in
     force,  or which  may  affect  the  covenants  or the  performance  of this
     indenture,  and the  Company  (to the extent it may  lawfully do so) hereby
     expressly  waives all benefits or advantage of any such law, and  covenants
     that it will not, by resort to any such law,  hinder,  delay or impeded the
     execution  of any power herein  granted to the Holder,  but will suffer and
     permit the execution of every such as though no such law has been enacted.

(15) Whenever any payment or other  obligation  hereunder  shall be due on a day
     other  than a  Business  Day,  such  payment  shall  be  made  on the  next
     succeeding Business Day.

(16) THE PARTIES HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE THE RIGHT
     ANY OF THEM MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION  BASED
     HEREON OR ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS AGREEMENT OR ANY
     TRANSACTION  DOCUMENT  OR  ANY  COURSE  OF  CONDUCT,   COURSE  OF  DEALING,
     STATEMENTS  (WHETHER  VERBAL OR  WRITTEN)  OR ACTIONS  OF ANY  PARTY.  THIS
     PROVISION  IS A MATERIAL  INDUCEMENT  FOR THE PARTIES'  ACCEPTANCE  OF THIS
     AGREEMENT.

(17) CERTAIN  DEFINITIONS  For purposes of this  Debenture,  the following terms
     shall have the following meanings:

     (a)  "Approved Stock Plan" means a stock option plan that has been approved
          by the  Board of  Directors  of the  Company,  pursuant  to which  the
          Company's  securities may be issued only to any employee,  officer, or
          director for services provided to the Company.

     (b)  "Bloomberg" means Bloomberg Financial Markets.

     (c)  "Business Day" means any day except Saturday, Sunday and any day which
          shall be a federal  legal  holiday  in the  United  States or a day on
          which banking  institutions are authorized or required by law or other
          government action to close.

     (d)  "Change  of  Control  Transaction"  means  the  occurrence  of  (a) an
          acquisition  after the date hereof by an individual or legal entity or
          "group"  (as  described  in Rule  13d-5(b)(1)  promulgated  under  the
          Exchange  Act)  of  effective   control   (whether  through  legal  or
          beneficial  ownership of capital stock of the Company,  by contract or
          otherwise)  of  in  excess  of  fifty  percent  (50%)  of  the  voting
          securities  of the  Company  (except  that the  acquisition  of voting
          securities  by the Holder or any other current  holder of  convertible
          securities  of the Company  shall not  constitute  a Change of Control
          Transaction  for purposes  hereof),  (b) a replacement  at one time or
          over  time of more  than  one-half  of the  members  of the  board  of
          directors of the Company  which is not approved by a majority of those
          individuals  who are  members  of the board of  directors  on the date
          hereof  (or by those  individuals  who are  serving  as members of the
          board  of  directors  on any date  whose  nomination  to the  board of
          directors  was  approved  by a majority of the members of the board of
          directors  who are  members  on the  date  hereof),  (c)  the  merger,
          consolidation  or sale of fifty percent (50%) or more of the assets of
          the  Company or any  subsidiary  of the  Company in one or a series of
          related transactions with or into another entity, or (d) the execution
          by the Company of an  agreement  to which the Company is a party or by
          which it is bound,  providing for any of the events set forth above in
          (a), (b) or (c).

     (e)  "Closing  Bid  Price"  means the price per share in the last  reported
          trade of the Common Stock on a Primary Market or on the exchange which
          the Common Stock is then listed as quoted by Bloomberg.

     (f)  "Convertible  Securities"  means any stock or  securities  (other than
          Options)  directly or indirectly  convertible  into or  exercisable or
          exchangeable for Common Stock.

     (g)  "Commission" means the Securities and Exchange Commission.

     (h)  "Common  Stock"  means the  common  stock,  par value  $0.001,  of the
          Company  and stock of any other  class  into  which  such  shares  may
          hereafter be changed or reclassified.

     (i)  "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     (j)  "Excluded  Securities" means, (a) shares issued or deemed to have been
          issued by the Company pursuant to an Approved Stock Plan (b) shares of
          Common  Stock  issued or deemed to be issued by the  Company  upon the
          conversion,  exchange or exercise of any right, option,  obligation or
          security  outstanding  on the  date  prior  to date of the  Securities
          Purchase  Agreement,  provided  that the terms of such right,  option,
          obligation  or security  are not amended or  otherwise  modified on or
          after the date of the Securities Purchase Agreement, and provided that
          the conversion price, exchange price, exercise price or other purchase
          price is not reduced, adjusted or otherwise modified and the number of
          shares of Common Stock issued or issuable is not increased (whether by
          operation of, or in accordance with, the relevant governing  documents
          or  otherwise)  on or  after  the  date  of  the  Securities  Purchase
          Agreement, (c) shares issued in connection with any acquisition by the
          Company,  whether  through an  acquisition of stock or a merger of any
          business,  assets or  technologies,  leasing  arrangement or any other
          transaction  the  primary  purpose  of which  is not to  raise  equity
          capital,  and (d) the  shares of Common  Stock  issued or deemed to be
          issued by the Company upon conversion of this Debenture.

     (k)  "Installment  Amount" means an aggregate of $250,000  combined between
          this  Debenture  and the Other  Debentures.  The Holder shall have the
          right to allocate  the total  Installment  Amount due to it among this
          Debenture and the Other  Debentures as it sees fit and shall  promptly
          notify the Company of such allocation.

     (l)  Installment  Conversion  Price" means, the lower of (i) the applicable
          Conversion Price and (ii) that price which shall be computed as ninety
          percent (90%) of the lowest daily Volume Weighted Average Price of the
          Common  Stock  during  the  twenty  (20)   consecutive   Trading  Days
          immediately  preceding  the  applicable  Installment  Date.  All  such
          determinations to be appropriately adjusted for any stock split, stock
          dividend, stock combination or other similar transaction

     (m)  "Installment Date" means February 1, 2008, and continuing on the first
          Business Day of each successive calendar month thereafter.

     (n)  "Other  Debentures"  means  the other  amended  and  restated  secured
          convertible debentures issued pursuant to the Agreement.

     (o)  "Options"  means any rights,  warrants or options to subscribe  for or
          purchase shares of Common Stock or Convertible Securities.

     (p)  "Original  Issue  Date"  means the date of the first  issuance of this
          Debenture  regardless of the number of transfers and regardless of the
          number of instruments, which may be issued to evidence such Debenture.

     (q)  "Person"  means  a  corporation,   an   association,   a  partnership,
          organization,  a business,  an  individual,  a government or political
          subdivision thereof or a governmental agency.

     (r)  "Reverse  Stock Split" means a 50 for 1 stock split to be completed by
          the Company.

     (s)  "Securities Act" means the Securities Act of 1933, as amended, and the
          rules and regulations promulgated thereunder.

     (t)  "Trading  Day"  means a day on which the  shares  of Common  Stock are
          quoted on the OTCBB or  quoted  or  traded on such  Primary  Market on
          which the shares of Common Stock are then quoted or listed;  provided,
          that in the event  that the  shares of Common  Stock are not listed or
          quoted, then Trading Day shall mean a Business Day.

     (u)  "Transaction  Documents"  shall have the meaning ascribed to it in the
          Agreement. .

     (v)  "Underlying  Shares"  means the shares of Common Stock  issuable  upon
          conversion  of this  Debenture or as payment of interest in accordance
          with the terms hereof.

     (w)  "Volume  Weighted  Average  Price"  means,  for any security as of any
          date, the daily dollar volume-weighted average price for such security
          on the Primary Market as reported by Bloomberg through its "Historical
          Prices - Px Table with  Average  Daily  Volume"  functions,  or, if no
          dollar volume-weighted  average price is reported for such security by
          Bloomberg, the average of the highest closing bid price and the lowest
          closing  ask price of any of the market  makers for such  security  as
          reported in the "pink sheets" by Pink Sheets LLC.

                            [Signature Page Follows]














     IN WITNESS  WHEREOF,  the  Company  has  caused  this  Secured  Convertible
Debenture to be duly  executed by a duly  authorized  officer as of the date set
forth above.

                                       COMPANY:
                                       GS CLEANTECH CORPORATION

                                       By:
                                       Name:    Kevin Kreisler

                                       Title:   Chairman




















                                    EXHIBIT I
                                CONVERSION NOTICE


        (To be executed by the Holder in order to Convert the Debenture)



TO:

     The  undersigned  hereby  irrevocably  elects to convert $________________
of the principal amount of  Debenture  No.GSCR  ___ into Shares of Common  Stock
of GS  CLEANTECH CORPORATION,  according to the conditions  stated therein,  as
of the Conversion Date written below.

Conversion Date:                           ____________________________
Conversion Amount to be converted:        $____________________________
Conversion Price:                         $____________________________
Number of shares of Common Stock to be
issued:                                    ____________________________
Amount of Debenture Unconverted:          $____________________________


Please issue the shares of Common Stock in the following name and to the
following address: Issue to:





Authorized Signature:                     ______________________________
Name:                                     ______________________________
Title:                                    ______________________________
Broker DTC Participant Code:
Account Number: