AGREEMENT

THIS AGREEMENT is effective the 10th day of January, 2008

AMONG:

          GS CLEANTECH CORPORATION, a company formed pursuant to the laws of the
          State of  Delaware  and having an office for  business  located at One
          Penn Plaza, Suite 1612, New York, New York 10119 ("GS CleanTech");

AND:

          GS AGRIFUELS CORPORATION, a company formed pursuant to the laws of the
          State of  Delaware  and having an office for  business  located at One
          Penn Plaza, Suite 1612, New York, New York 10119 ("GS AgriFuels");

AND:

          YA GLOBAL INVESTMENTS,  L.P., having an office for business located at
          the 101 Hudson  Street,  Suite 3700,  Jersey  City,  New Jersey  07302
          ("Lender").

WHEREAS:

A.   GS  CleanTech  beneficially  owns  26,398,992  shares of common stock in GS
     AgriFuels,  which shares  correspond to 90.1% of GS  AgriFuels'  29,024,572
     issued and outstanding shares of common stock (the "Common Shares").

B.   In June 2007, and subject to the satisfaction of GS AgriFuels'  outstanding
     obligations  to  Lender,   GS  AgriFuels  agreed  to  issue  to  GreenShift
     Corporation  1,000,000  shares of Series C Preferred  Stock in GS AgriFuels
     (the "Preferred  Shares"),  from which GreenShift  agreed to assign 378,653
     shares Series C Preferred  Stock in GS AgriFuels to a former  officer of GS
     AgriFuels  subject to Lender's first priority  security  interest in all of
     the stock and assets of GS AgriFuels.

C.   As of the date  hereof (i) GS  AgriFuels  is  indebted  to the Lender in an
     amount in excess of  $20,359,631  in  principal  plus  accrued  and  unpaid
     interest,  as evidenced by those secured  convertible  debentures listed on
     Schedule A attached hereto (the "Debentures"), (ii) the Lender is the owner
     of those certain warrants to purchase  additional shares of common stock of
     GS  AgriFuels  as set forth on  Schedule  A, and (iii)  the  Lender  and GS
     AgriFuels are party to those certain credit and related security and pledge
     agreements (the "Transaction Documents") as set forth on Exhibit A.

D.   While none of the  Preferred  Shares  were issued  because  issuance of the
     Preferred  Shares would have constituted a material breach of GS AgriFuels'
     Debentures  and  Transaction  Documents  with  Lender  (collectively,   the
     "Transaction Documents"), GS AgriFuels' agreement to issue and GreenShift's
     agreement to assign the Preferred Shares were made in contravention of both
     GS AgriFuels'  Transaction  Documents and GreenShift's  various  agreements
     with Lender.

E.   GS CleanTech  desires to transfer  its interest in the capital  stock of GS
     AgriFuels to a wholly-owned  subsidiary of GS CleanTech (the "Subsidiary").
     The Subsidiary  will then merge GS AgriFuels into itself in accordance with
     the short-form  merger  procedures  provided in Section 253 of the Delaware
     General  Corporation  Law. All  shareholders of GS AgriFuels other than the
     Subsidiary will receive a cash payment of $0.50 per share (the "Shareholder
     Cash Payment") as a result of the merger, and will cease to be shareholders
     of GS AgriFuels. GS CleanTech expects to distribute the cash payments to GS
     AgriFuels'  shareholders on January 30, 2008. The aforementioned merger and
     acquisition  of GS AgriFuels  shares shall be referred to herein as the "Go
     Private Transaction."

F.   GS  CleanTech  desires  to  obtain  Lender's  consent  to  the  Go  Private
     Transaction  and Lender  desires to herein confirm the terms and conditions
     under which Lender is willing to grant such consent.

NOW THEREFORE THIS AGREEMENT  WITNESSETH THAT in  consideration  of the premises
and the mutual covenants,  agreements,  representations and warranties contained
herein, and other good and valuable  consideration,  the receipt and sufficiency
of which is hereby acknowledged, the parties hereto hereby agree as follows:

Section 1          Consent to Go Private Transaction

Lender hereby grants its consent to the completion by GS CleanTech, GS AgriFuels
and Subsidiary of the Go Private Transaction.

Section 2         Subsidiary Capitalization After Go Private Transaction

     (a)  Subsidiary  shall have no more than  36,650,630  shares (the  "Maximum
          Shares") of issued and  outstanding  common  stock on a fully  diluted
          basis which shall including any shares of common stock  underlying any
          stock, warrant,  option, or other security or debt instrument directly
          or indirectly  convertible  into or  exercisable or  exchangeable  for
          common stock ("Common Stock  Equivalents")  and no shares of preferred
          stock  issued  and  outstanding  after  completion  of the Go  Private
          Transaction. Likewise, except for the shares of common stock or Common
          Stock  Equivalents   issued  to  Lender,   neither  GS  CleanTech  nor
          Subsidiary  shall cause to be issued any shares of Subsidiary  capital
          stock  until such time as Lender's  Debentures  have been paid in full
          and  Lender's  security  interest  has been  released  (unless  Lender
          otherwise consents to any such issuance in writing).

     (b)  Subsidiary  shall issue to the Lender 3,329,630 shares of common stock
          which shall be issued to Lender as soon as feasible  after  completion
          of the Go Private  Transaction  but in any event prior to February 15,
          2008. The Maximum Shares shall include the issuance of these 3,329,630
          shares.  Furthermore,  the  Subsidiary  shall  issue  to the  Lender a
          warrant in the form  attached  hereto as Exhibit B (the  "Warrant") to
          purchase  an  additional  1,665,000  shares  of  common  stock  of the
          Subsidiary at an exercise price of $0.001 per share.

Section 3         Independent Valuation

GS CleanTech  hereby agrees that it shall use its best efforts in a diligent and
aggressive  manner to obtain an  independent  valuation  report (the  "Valuation
Report") from an independent  valuation firm acceptable to the Lender, the scope
of which report shall be to assess the enterprise value (the "Enterprise Value")
and equity value (the "Equity  Value") of GS AgriFuels and its  operations as of
the date of the Go  Private  Transaction  (which  operations  solely  include GS
AgriFuels'  wholly-owned NextGen Fuel, Inc. ("NextGen") and Sustainable Systems,
Inc. ("Sustainable") subsidiaries).

Section 4         Debenture Conversion

The Conversion Price of all of the Debentures  payable by GS AgriFuels to Lender
shall be  adjusted  to be equal to a per share  rate  equal to 80% of the equity
value derived in the Valuation Report (the "Conversion Price"), but no more than
$0.255, in either case as may be adjusted pursuant to the anti-dilution terms of
the Debentures; the formula for the calculation of the Conversion Price shall be
as follows:

              Conversion Price = (80%) x (Equity Value/36,650,630)

     (a)  Restriction on Conversion

          The 4.99%  ownership  limitations  set forth in  Sections  4(b)(i)  or
          3(a)(ii) of the Debentures  (as applicable  shall not apply so long as
          the common stock of GS AgriFuels is not registered pursuant to Section
          12 of the Exchange  Act. In the event that that the Common Stock of GS
          AgriFuels  becomes  registered  pursuant to Section 12 of the Exchange
          Act, the Lender shall not have the right to convert any portion of the
          Debentures  or  receive  shares  of GS  AgriFuels  common  stock  upon
          conversion of the Debentures to the extent that after giving effect to
          such conversion or receipt of such interest payment,  Lender, 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
          GS AgriFuels common stock outstanding  immediately after giving effect
          to such  conversion  or receipt of shares as payment of interest.  The
          provisions  of this  Section  may be waived by Lender at will upon not
          less than 65 days prior notice to GS AgriFuels.

     (b)  Conversion Price after Go Public Transaction.

          If conversions  are made after GS Agrifuels  becomes  publicly  traded
          then the  conversion  price at that time will be equal to the lower of
          the (i)  Conversion  Price set  forth in  Section 4 hereof or (ii) the
          price equal to eighty  percent  (80%) of the lowest  daily VWAP of the
          Common Stock during the 20 trading days (or such shorter  period if 20
          trading  days  have not  elapsed  from the date GS  Agrifuels  becomes
          publicly traded) immediately prior to the conversion date.

     (c)  Security.

          GS  AgriFuels  acknowledges  and  agrees  that the  obligations  of GS
          AgriFuels  under  the  Debentures  are  secured  by  certain  existing
          security  agreements,   pledge  agreements,  and  guaranty  agreements
          (collectively,  the "Prior Security Documents"),  and shall be further
          secured  by the  Global  Security  Agreement  among the  Company,  the
          Lender,  and  other  parties  dated on or about the date  hereof  (the
          "Security Agreement"),  the Global Pledge Agreement among the Company,
          the Lender,  and other  parties dated on or about the date hereof (the
          "Pledge  Agreement"),  the  Global  IP  Security  Agreement  among the
          Company,  the  Lender,  and other  parties  dated on or about the date
          hereof (the "IP Security  Agreement")  the Global  Guaranty  Agreement
          among the Company, the Lender, and other parties dated on or about the
          date  hereof (the  "Guaranty  Agreement"  and along with the  Security
          Agreement, the Pledge Agreement, and the Prior Security Documents, the
          IP Security  Agreement,  any mortgages granted to the Lender,  and all
          other documents,  instruments, and agreements granted to the Lender to
          secure the  obligations  of the Company to the Lender,  the  "Security
          Documents").  GS AgriFuels further  acknowledges,  confirms and agrees
          that  Lender has and shall  continue to have  valid,  enforceable  and
          perfected  liens  upon  and  security  interests   heretofore  granted
          pursuant to any and all of the Prior  Security  Documents and that the
          security  interests and  guaranties  granted  pursuant to the Security
          Agreement,  the Guaranty  Agreement,  the IP Security  Agreement,  any
          mortgages  granted  to the  Lender,  and  the  Pledge  Agreement,  are
          intended to be supplemental to, and not in limitation of, the existing
          security  interests or guaranties  granted to the Lender to secure the
          Obligations, whether under the Prior Security Documents or otherwise.

Section 5         Cash Payments

GS AgriFuels shall make cash payments against the principal and accrued interest
payable to Lender pursuant to the Debentures on the basis of the following terms
and conditions:

     (a)  Monthly Payments; NextGen Cash Receipts

          GS AgriFuels  shall cause  NextGen to pay to Lender cash payments at a
          rate equal to 10% of NextGen's  cash  receipts on a monthly basis (the
          "Monthly Payment").

     (b)  Quarterly Payments; Free Cash Flows

          In the event and to the extent  that GS  AgriFuels  produces  positive
          cash flows after  meeting  all of its  operational,  debt  service and
          other routine  requirements,  including  the Monthly  Payments made to
          Lender hereunder,  GS AgriFuels shall pay to Lender cash payments at a
          rate equal to 50% of GS AgriFuels' net cash flows on a quarterly basis
          (the "Quarterly Payment").

     (c)  Application of Payments

          The Lender shall have the right to allocate  all payments  received by
          it in  respect  of the  Debentures  as it sees fit and shall  promptly
          notify the GS AgriFuels of such allocations.

Section 6         Payment Milestone

In the event that GS AgriFuels  and/or any of its affiliates fails to pay Lender
a minimum of $7,500,000  on or before July 1, 2008, or a minimum of  $15,000,000
on or before  September  30,  2008,  or a minimum  of  $25,000,000  on or before
December 31, 2008, then,  within no more than 60 days of GS CleanTech's  receipt
of written notice from Lender, GS CleanTech shall take GS AgriFuels public again
as provided herein (the "Go Public Transaction")

     (a)  Go Public Transaction

          As used herein, the term "Go Public Transaction" shall refer to either
          a distribution of GS AgriFuels shares to GS CleanTech's  shareholders,
          or  a  reverse-merger  with  an  affiliate  of  GS  CleanTech,   or  a
          reverse-merger with a separate public shell; or, if GS CleanTech fails
          to  timely  complete  any  of  the  foregoing  transactions,  then  GS
          CleanTech  shall be obligated to  facilitate  a  reverse-merger  of GS
          AgriFuels with a public shell of Lender's choosing, which public shell
          may owe Lender up to  $2,000,000  in  convertible  or other debt to be
          assumed by GS AgriFuels.

Section 7         Additional Conditions

     (a)  Cost of Go Private Transaction

          The aggregate  Shareholder  Cash Payment  shall not exceed  $1,000,000
          unless waived by the Lender.

     (b)  Appraisal Rights

          The per share Equity Value as determined by the Valuation Report shall
          be equal to or less  than 1.2 times  the per  share  Shareholder  Cash
          Payment,  unless waived by the Lender.  In the event and to the extent
          that the per share Equity Value exceeds the per share Shareholder Cash
          Payment,  then  GS  CleanTech  shall  pay or  cause  to be  paid to GS
          AgriFuels' unaffiliated minority shareholders of record as of the date
          of the Go Private  Transaction  an additional per share cash sum equal
          to the per share difference between the per share Equity Value and the
          per share Shareholder Cash Payment.

     (c)  Failure to Meet Additional Conditions

          In the event that the  conditions  provided  in Section  7(a) and 7(b)
          hereof  are  not  met,  then,  within  no  more  than  60  days  of GS
          CleanTech's  receipt of written notice from Lender, GS CleanTech shall
          take GS AgriFuels public again via a qualified Go Public Transaction.

Section 8         Restrictive Covenants

GS AgriFuels further agrees as follows:

     (a)  No Payment of Management Fees.

          GS AgriFuels  shall not make any payments of (i) salaries,  management
          fees,  commissions or any other  remuneration to officers or directors
          of the Company or any person or entity that is an  "affiliate"  of any
          such  person or entity  (the  "Management  Group")  other  than in the
          ordinary course of business or (ii) on any notes,  accounts payable or
          other  obligations  or  liabilities  owed to any member of  Management
          Group other than in the ordinary course of business.

     (b)  No Merger or Sale of Business.

          For so long as the Debentures  are  outstanding,  GS AgriFuels  hereby
          agrees  that it will not  merge or  consolidate  with  any  person  or
          entity,  or sell, lease or otherwise  dispose of its assets other than
          in  the   ordinary   course  of  business   involving   an   aggregate
          consideration  of more than ten percent (10%) of the book value of its
          assets on a consolidated  basis in any 12 month period,  or liquidate,
          dissolve, recapitalize or reorganize.

     (c)  No Indebtedness.

          For so long as the Convertible Debenture is outstanding,  GS AgriFuels
          shall  not  incur  any  indebtedness  for  borrowed  money or become a
          guarantor or otherwise  contingently  liable for any such indebtedness
          except for trade  payables or purchase money  obligations  incurred in
          the ordinary course of business, other than to the Lender.

     (d)  Capital Structure of the Company.

          Except as set forth  herein,  GS AgriFuels  shall not change or modify
          its capital structure without the written consent of the Lender.

Section 6         Miscellaneous

     (a)  Expenses

          Each  of the  Parties  hereto  shall  pay its own  fees  and  expenses
          (including the fees of any attorneys,  accountants,  or others engaged
          by such Party) in connection with this Agreement and the  transactions
          contemplated  hereby  whether  or not  the  transactions  contemplated
          hereby are consummated.

     (b)  Paragraph Headings and Language Interpretations

          The paragraph  headings  contained  herein are for reference  only and
          shall not be considered substantive provisions of this Agreement.  The
          use of a singular or plural form shall include the other form, and the
          use of a masculine,  feminine or neuter gender shall include the other
          genders, as applicable.

     (c)  Notices

          All notices, claims, demands, and other communications hereunder shall
          be in  writing  and shall be deemed  given  upon (a)  confirmation  of
          receipt of a  facsimile  transmission,  (b)  confirmed  delivery  by a
          standard  overnight  carrier  or when  delivered  by hand,  or (c) the
          expiration  of five (5)  business  days  after the day when  mailed by
          registered  or  certified  mail  (postage   prepaid,   return  receipt
          requested),  addressed  to the  respective  parties  at the  following
          addresses  (or such other address for a party as shall be specified by
          like notice) noted in the preamble hereto.

     (d)  Assignments

          This Agreement and all of the provisions  hereof shall be binding upon
          and inure to the  benefit of the Parties  hereto and their  respective
          successors and permitted assigns; provided, however, that neither this
          Agreement nor any of the rights,  interests,  or obligations hereunder
          may be assigned by any of the Parties hereto without the prior written
          consent  of the  other  Party,  except  that this  Agreement  and such
          rights,  interests and obligations may be assigned by Purchaser to one
          (1) or more  Affiliates.  Purchaser  agrees  that any such  assignment
          shall not relieve Purchaser of its obligations hereunder.

     (e)  Entire Agreement

          This  Agreement  (including  the  Schedules  and any Exhibits  hereto)
          embodies the entire  agreement and  understanding  of the Parties with
          respect to the  transactions  contemplated  hereby and  supersedes all
          prior written or oral commitments,  arrangements,  understandings  and
          agreements   with  respect   thereto.   There  are  no   restrictions,
          agreements,  promises,  warranties,  covenants  or  undertakings  with
          respect  to the  transactions  contemplated  hereby  other  than those
          expressly sat forth herein.

     (f)  Modifications, Amendments and Waivers

          At any time prior to the Closing,  to the extent permitted by law, (i)
          Purchaser  and Seller  may,  by written  agreement,  modify,  amend or
          supplement  any term or provision of this  Agreement and (ii) any term
          or provision of this  Agreement  may be waived in writing by the Party
          which is entitled to the benefits thereof.

     (g)  Counterparts

          This Agreement may be executed in two (2) or more counterparts, all of
          which shall be considered  one (1) and the same  agreement and each of
          which shall be deemed an  original.  Each Party shall  receive a fully
          signed copy of this Agreement.

     (h)  Governing Law

          This  Agreement  shall be  governed  by the  laws of the  State of New
          Jersey and the United States of America  (regardless  of the laws that
          might  be  applicable   under   principles  of  conflicts  of  law  or
          international  law) as to all matters  including,  but not limited to,
          matters of validity, construction, effect and performance.

     (i)  Accounting Terms

          All  accounting  terms used herein which are not expressly  defined in
          this  Agreement  shall have the  respective  meanings given to them in
          accordance with generally accepted  accounting  principles on the date
          hereof.

     (j)  Severability

          If any one (1) or more of provisions of this  Agreement  shall be held
          to be invalid,  illegal or  unenforceable,  the validity,  legality or
          enforceability of the remaining provisions of this Agreement shall not
          be affected  thereby.  To the extent permitted by applicable law, each
          party waives any  provision of law which renders any provision of this
          Agreement invalid, illegal or unenforceable in any respect.

     (k)  Specific Performance

          Purchaser  and  Seller  recognize  that any  breach of the terms  this
          Agreement  may give rise to  irreparable  harm for which money damages
          would  not be an  adequate  remedy,  and  accordingly  agree  that any
          non-breaching  party  shall be  entitled  to enforce the terms of this
          Agreement by a decree of specific performance without the necessity of
          proving  the  inadequacy  as a remedy of money  damages.  If  specific
          performance is elected as a remedy hereunder, the electing Party shall
          be deemed to have waive any claim for other damages, except reasonable
          attorneys fees,  costs of suit and expenses related to the enforcement
          of specific performance.

     (l)  Consent to Jurisdiction

          Seller and Purchaser  hereby submit and consent to the exclusive venue
          and  jurisdiction  of the  Supreme  Court of the  State of New York in
          respect of the  interpretation  and  enforcement  of the provisions of
          this Agreement,  and hereby waive and agree not to assert as a defense
          in  any  action,   suit  or  proceeding  for  the   interpretation  or
          enforcement of this Agreement,  that it is not subject thereto or that
          such  action,  suit  or  proceeding  may  not  be  brought  or is  not
          maintainable in said courts or that this Agreement may not be enforced
          in or by said  courts or that its  property  is exempt or immune  from
          execution,  that the  suit,  action or  proceeding  is  brought  in an
          inconvenient  forum,  or  that  the  venue  of  the  suit,  action  or
          proceeding  is improper.  Seller and  Purchaser  agree that service of
          process may be made in any manner  permitted  by the laws of the State
          of New  York or the  federal  laws of the  United  States  in any such
          action, suit or proceeding against Seller or Purchaser with respect to
          this Agreement. Service of process upon such authorized agent shall be
          deemed, in every respect,  effective service of process upon Seller or
          Purchaser and shall remain  effective  until Seller or Purchaser shall
          appoint  another agent for service or process  acceptable to the other
          Party.  Seller and Purchaser agree that final judgment (with all right
          of  appeal  having  expired  or been  waived)  against  it in any such
          action,  suit or  proceeding  shall be  conclusive  and that the other
          Party is entitled to enforce such  judgment in any other  jurisdiction
          by suit on the judgment, a certified copy of which shall be conclusive
          evidence  of the fact and  amount of  indebtedness  arising  from such
          judgment.

     (m)  Binding Effect

          This  Agreement  shall be binding upon and inure to the benefit of the
          parties  hereto  and  their  respective   heirs,   successors,   legal
          representatives and assigns.

     (n)  Force Majeure

          Neither  Party  hereto  shall be liable for  failure  to  perform  any
          obligation  under this  Agreement if such failure to perform is caused
          by the occurrence of any contingency  beyond the reasonable control of
          such Party,  including,  without  limitation,  fire, flood,  strike or
          other industrial  disturbance,  failure of transport,  accident,  war,
          riot, insurrection,  act of God or order of governmental agency or act
          of  terrorism.  Performance  shall be resumed  as soon as is  possible
          after cessation of such cause.  However,  if such inability to perform
          continues  for more  than  Ninety  (90)  days,  the  other  Party  may
          terminate this Agreement without penalty and without further notice.

     (n)  Obligations

          All amounts owed, together with interest accrued and accruing thereon,
          and  fees,  costs,  expenses  and  other  charges  (collectively,  the
          "Obligations")  now or hereafter payable by GS AgriFuels to the Lender
          under the Debentures and all other agreements,  contracts, instruments
          or other items delivered in connection  therewith are  unconditionally
          owing by GS AgriFuels to Lender,  without offset,  setoff,  defense or
          counterclaim of any kind, nature or description whatsoever.

IN WITNESS WHEREOF the parties have executed this Agreement  effective as of the
day and year first above written.



GS CLEANTECH CORPORATION



By:      /s/ Kevin Kreisler
         ----------------------------------
             Kevin Kreisler
             Chairman


GS AGRIFUELS CORPORATION



By:      /s/ Kevin Kreisler
         ----------------------------------
             Kevin Kreisler
             Chairman


GS ENERGY CORPORATION



By:      /s/ Kevin Kreisler
         ----------------------------------
             Kevin Kreisler
             Chairman



                                         YA GLOBAL INVESTMENTS, L.P.

                                         By:  Yorkville Advisors, LLC
                                         Its: Investment Manager

                                         By:  /s/ Troy Rillo
                                              -------------------------------
                                         Name:    Troy Rillo
                                         Title:   Senior Managing Director