WASTE RECOVERY, INC.

                     18% CONVERTIBLE SUBORDINATED DEBENTURE
                              DUE JANUARY 31, 1997


                                 DEBENTURE NO. 1


Dollar Amount  $________                                         March 15, I996

         Waste Recovery,  Inc., a corporation  duly organized and existing under
the laws of the State of Texas (herein referred to as the "Company"),  for value
received,  hereby  promises to pay to  ________________________,  or  registered
assigns, the principal sum of __________________________________  ($__________),
in any coin or  currency  of the United  States of America  which at the time of
payment is legal tender for the payment of public and private debts,  and to pay
interest  thereon as  hereinafter  provided  from the date hereof at the rate of
18o/o per annum, in like coin or currency,  said payments to be made as follows:
principal and accrued interest shall be due and payable on January 31,1997.  The
payments  will be paid to the person in whose name this  Debenture is registered
on the books and records of the Company.  Both principal of and interest on this
Debenture  are  payable at the office of the  Company as  provided in Section 12
below.

1.       Restrictions on Transfer; Registration

         Additional  provisions of this Debenture are contained on the following
pages hereof.  However,  this Debenture is specifically subject to the following
legend:

         THE SECURITIES  REPRESENTED BY THIS CERTIFICATE HAVE BEEN ISSUED TO THE
         REGISTERED OWNER IN RELIANCE UPON REPRESENTATIONS THAT THESE SECURITIES
         HAVE  BEEN  TAKEN  FOR  INVESTMENT.  THESE  SECURITIES  HAVE  NOT  BEEN
         REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE
         SOLD, TRANSFERRED OR ASSIGNED UNLESS AN OPINION OF COUNSEL SATISFACTORY
         TO THE  COMPANY  SHALL HAVE BEEN  RECEIVED BY THE COMPANY TO THE EFFECT
         THAT SUCH SALE,  TRANSFER OR ASSIGNMENT WILL NOT BE IN VIOLATION OF THE
         SECURITIES  ACT OF 1933,  AS  AMENDED,  AND THE RULES  AND  REGULATIONS
         THEREUNDER, OR APPLICABLE STATE SECURITIES LAWS.





2.       Issue

         This Debenture is one of a duly  authorized  issue of Debentures of the
Company known as its 18% Convertible Subordinated Debentures due January 31,1997
(herein  called  the  "Debentures"),  limited to a minimum  principal  amount of
$200,000.00 and a maximum principal amount of $495,000.00.

3.       Redemption

         This Debenture will be redeemable by the Company,  in whole or in part,
upon the earlier of (a) August 31, 1996 or (b) five business days  following the
record date of a rights  offering,  or other public  offering,  of the Company's
common  stock,  no par  value  ("Common  Stock")  that is  registered  with  the
Securities and Exchange  Commission.  The redemption price will be the principal
amount of this Debenture plus interest accrued to the date fixed for redemption.
This  Debenture  will become due and payable and will cease to bear  interest on
the date fixed for the redemption.

4.       Notice of Redemption

         Before redeeming, the Company will give notice to any registered holder
of this Debenture of its intention to redeem and of the redemption date at least
thirty (30), and not more than sixty (60), days prior to such  redemption  date.
Notice  shall be sent by certified  mail to the last  address of the  registered
holder as it appears on the registration books of the Company.

5.       Conversion

         This  Debenture  will be  convertible  at the option of the  registered
holder, in a minimum amount of $10,000.00, at any time prior to its maturity. If
this Debenture is called for  redemption,  it will be  convertible,  and must be
received by the Company, at any time prior to the close of business on the fifth
day preceding the date fixed for redemption.  This Debenture will be convertible
into  fully  paid and  nonassessable  shares of  shares  of Common  Stock of the
Company  at the  rate of one  share  for  each  $0.875  principal  amount  to be
converted.  At the option of the  holder,  accrued  and unpaid  interest  may be
converted at the time a holder converts all of his principal at a rate of $0.875
per share. After conversion,  the holder will not be entitled to any interest on
this Debenture, or the amount thereof converted, not due and payable at or prior
to the date of conversion.  Fractional shares will not be issued and no payments
will be made in lieu of fractional  shares.  Executive officers and directors of
the Company who subscribe  cannot convert  principal or interest until September
15, 1996.





6.       Notice of Conversion

         In order to  exercise  the  conversion  privilege,  the  holder of this
Debenture will surrender it to the Company with the form of notice duly executed
in substantially  the form attached hereto as Exhibit A. If the stock into which
the Debenture is  convertible is to be issued in a name or names other than that
of the registered owner of this Debenture,  the Debenture must be accompanied by
proper  assignment in  substantially  the form attached hereto as Exhibit B. The
Company will  promptly  issue to the holder or assignee the shares of stock into
which this  Debenture  is to be  convertible.  Such notice must be  delivered in
person or sent by certified mail.

7.       Subordination

         The indebtedness  evidenced by the Debentures,  including the principal
thereof and interest thereon, is expressly  subordinated and subject in right of
payment to the prior payment in full of all senior  indebtedness of the Company,
and each holder of this Debenture, by accepting the same, agrees to and shall be
bound by such  provisions.  Senior  indebtedness is defined as the principal of,
and premium and interest on, indebtedness of the Company for money borrowed from
persons,  firms or corporations that regularly engage in the business of lending
money. In the event of any insolvency, bankruptcy, receivership, liquidation, or
any other marshalling of the assets and liabilities of the Company,  the holders
of senior  indebtedness  will be  entitled  to  receive  payment  in full of all
principal  and  interest  on all senior  indebtedness  before the holder of this
Debenture  is  entitled  to receive  any  payment on  account  of  principal  or
interest.

8.       Modification

         Modifications  or  alterations  of the  rights and  obligations  of the
Company and of the holders of the Debentures may be made with the consent of the
Company  and with the  consent of the  holders  of not less than a  majority  in
principal amount of the Debentures then  outstanding;  provided,  however,  that
without the consent of the holder  hereof,  no such  modification  or alteration
shall be made which will  affect  the terms of  payment of the  principal  of or
interest on this Debenture,  or reduce the percentage of principal amount of the
Debentures the holders of which are required to consent to such  modification or
alteration.

9.       Default

         a.  Payment.  In case of a default in the punctual  payment  under this
Debenture shall occur, and continue for a period of ten (10) business days after
receipt of notice sent to the Company by certified  mail, then the principal and
all accrued interest on all the Debentures then outstanding shall become due and
payable.  Such declaration of default and acceleration of principal and interest
may be rescinded or annulled by the holders of a majority in principal amount of
the Debentures outstanding.





         b.  Bankruptcy  or  Insolvency.  In the event of either (1) a decree or
order by a court  shall have been  entered  adjudging  the Company a bankrupt or
insolvent,  or appointing a receiver or trustee for the affairs or assets of the
Company and such decree or order shall have  remained in force  undischarged  or
unstayed for a period of ninety (90) days,  or (2) the Company  shall  institute
proceedings  to be  adjudicated  a voluntary  bankrupt,  or shall consent to the
filing of any such petition or to the  appointment of a receiver or trustee,  or
shall make an  assignment  for the benefit of  creditors,  then, so long as such
event of default  shall not have been  remedied,  unless the  principal  of this
Debenture  shall have already  become due and  payable,  the holder by notice in
writing  to the  Company  may  declare  the  principal  of this  Debenture  then
outstanding and the interest accrued thereon, if not already due and payable, to
be due and payable immediately.  Upon receipt of any such declaration,  the same
shall be immediately due and payable.

10.      Transfer

         This  Debenture is  transferable  by the  registered  owner hereof,  in
person or by duly authorized attorney, at the office of the Company, on books of
the Company to be kept for that purpose, upon surrender and cancellation of this
Debenture and on presentation of a duly executed written  instrument of transfer
substantially  in the  form of  Exhibit  B, and  thereupon  a new  Debenture  or
Debentures,  of the same  aggregate  principal  amount,  will be  issued  to the
transferee or transferees,  in exchange  herefor;  and this  Debenture,  with or
without  other  Debentures,  may in like manner be exchanged for one or more new
Debentures of other authorized denominations but of the same aggregate principal
amount.  Any such transfer or exchange shall be without charge,  except that the
Company  may require the payment of a sum  sufficient  to  reimburse  it for any
stamp tax or other  governmental  charge or  expense  in  connection  therewith.
Notwithstanding,  new Debentures will not be reissued in denominations less than
$5,000.00

11.      Registered Owner for Payment

         Any paying agent, registrar,  the Company, or any agent of the Company,
may deem and treat the person in whose name this  Debenture is registered as the
absolute  owner  hereof for the purpose of receiving  payment of  principal  and
interest due herein, and for all other purposes, and neither the Company nor any
paying agent, nor any registrar,  nor any agent of the Company shall be affected
by,  nor  shall  any  liability  accrue  to,  such  parties  as a result of such
treatment.

12.      Address of Company

         Unless changed by written notice to the holder of this  Debenture,  for
the purposes of payment of principal and interest, redemption of this Debenture,
or  delivery  of notices to the  Company,  the  address of the  Company  for the
purposes of this Debenture is 309 South Pearl Expressway, Dallas, Texas 75201.





13.      Registration Rights.

         a.  Registration  Proposed by the Company.  As used in this Section 13,
the term  "Registrable  Stock" shall mean and include all shares of Common Stock
received or receivable upon a conversion of the Debentures.  If at any time, and
from time to time,  the Company  proposes to  register  any of its Common  Stock
under  the  Securities  Act of  1933,  as  amended  (the  "Securities  Act")  in
connection with a public offering (other than a registration  effected solely to
implement an employee  benefit plan or a transaction to which Rule 145 under the
Securities Act is applicable), it will each such time give written notice to all
holders of the Debentures of its intention to do so and, upon written request of
any such holder  delivered to the Company  within 30 days after  receipt of such
notice  (which  request  shall state the number of shares of Common  Stock to be
registered  and the intended  method of  disposition),  the Company will use its
best efforts, at its own expense to the extent provided below, to register under
the Securities Act all shares of Registrable Stock requested to be so registered
by such holder,  all to the extent  requisite to permit the disposition  thereof
(in  accordance  with the intended  method  thereof,  as  aforesaid);  provided,
however,  that if the sole or managing  underwriter of such offering  determines
that the  aggregate  number of  shares  of  Registrable  Stock  which  have been
requested  by the holder  thereof to be included in the  registration  should be
limited to a lesser  number due to market  conditions  and/or the  necessity  of
including in such underwriting or registration shares to be sold for the account
of the  Company,  then the  holder  may sell only his pro rata  portion  of such
lesser number of shares available for registration (such portion available to be
the total amount of shares which can be registered  less those to be sold by the
Company),  such right to sell to be proportioned  among all  shareholders of the
Company  asserting  and having  registration  rights.  All persons who  acquired
registration rights prior in time to the holders of Registrable Stock shall have
priority  to  register  all of  their  shares  with  such  rights  ahead  of any
Registrable  Stock. In the event that not all Registrable  Shares can be sold in
such  registration,  the Company will promptly file a registration  statement to
register the  remainder of such  Registrable  Shares for sale in the open market
and to use its best efforts to cause such registration  statement to be declared
effective so that the related registration  statement and prospectus will remain
effective  for  nine  months   following  any  lock-up  period  required  by  an
underwriter.

         Should the Company  terminate the registration  first referred to above
in this Section prior to its effectiveness, the Company shall have no obligation
to the holders with respect to registering any  Registrable  Stock in connection
with either  registration.  The rights under this Section 13(a) shall  terminate
when the holders are  eligible to sell  Registrable  Stock under Rule 144 of the
Securities Act.





         b. Registration Requested by the Holders. Upon written request, made at
any  time by any  holder,  to  register  under  the  Securities  Act  shares  of
Registrable Stock held by or issuable to him, the Company will (i) promptly give
written  notice  of  such  proposed  registration  to  all  of  the  holders  of
Registerable Stock and (ii) as expeditiously as possible and in any event within
120 days, file a registration statement under the Securities Act, and thereafter
use all  reasonable  efforts,  at the  expense  of such  holders  to the  extent
provided below,  to obtain  acceleration of the effective date thereof under the
Securities Act of:

         (i)      the Registrable  Stock which the Company has been requested to
                  register  pursuant to the written  request  referred to above,
                  for  disposition by the respective  holders in accordance with
                  the intended method of disposition  described in such request;
                  and

         (ii)     all other shares of  Registrable  Stock held by or issuable to
                  holders   who  shall  have  made   written   request  for  the
                  registration   thereof   (stating  the   intended   method  of
                  disposition)  to  the  Company,  such  written  request  to be
                  delivered  to the  Company  within  thirty (30) days after the
                  giving of the above written notice by the Company

all to the extent  requisite to permit the  disposition  (in accordance with the
intended  methods  thereof,  as aforesaid)  by the holders of the  securities so
registered,  and the Company  agrees that in connection  with effecting any such
registration it will execute any undertakings to file post-effective  amendments
as may be required and, in addition to its obligations hereunder, it will effect
appropriate  compliance with exemptive  regulations  issued under the Securities
Act and  any  other  governmental  requirements  or  regulations  to the  extent
requisite to permit such disposition. The Company shall be obligated to register
Common Stock pursuant to this Section 13(b) on only one occasion.

         c. Certain  other Rights.  If by February 1, 1995,  the Company has not
initiated a  registration  of its Common Stock under the  Securities  Act (other
than a registration  effected solely to implement an employee  benefit plan or a
transaction  under Rule 145 of the Securities  Act),  then the Company will give
notice to holders of the  Debentures  of its  intention  to file a  registration
statement for  Registrable  Stock under the Securities Act, and that holders who
have  converted  to Common  Stock  effective  within  thirty (30) days after the
giving of such notice are  eligible to  participate  in such  registration.  The
Company will promptly file such a  registration  statement to register  eligible
Registrable Shares for sale in the open market and use its best efforts to cause
such  registration  statement to be declared  effective so that the registration
statement and prospectus will remain effective for a nine-month period.






         d. Costs and Expenses.  All costs and expenses in  connection  with the
registration  of securities  under  Sections  13(a) and 13(c) hereof,  including
federal and state registration and filing fees incurred in connection therewith,
printing   expenses   (including  such  number  of  any  preliminary  and  final
prospectuses,  to  include  post-effective  amendments  and  supplements  to the
registration  statement,   as  may  reasonably  be  requested),   the  fees  and
disbursements of its counsel and of independent accountants and other experts of
the Company, shall be borne by the Company (except that regarding Section l3(c),
all such  costs in excess of  $100,000  shall be borne  pro rata by  holders  of
Registrable  Shares) and all such  expenses in  connection  with a  registration
pursuant  to Section  13(b)  hereof  shall be borne by the  holders pro rata who
demand any such registration;  provided,  however, that the Company shall not be
obligated to pay underwriter's  discounts and commissions and fees in connection
with a  registration  of the  Registrable  Stock  pursuant to Sections 13(a) and
13(c) hereof.  The Company will keep  effective any such  registration  for such
period as may  reasonably be necessary to effect the  disposition  in accordance
with the intended methods described in the requests for registration, but if the
Company is requested or required to maintain  such  registration  effective  for
more than nine months,  all  out-of-pocket  expenses of the Company  incurred in
maintaining such  effectiveness  after such nine-month  period shall be borne by
the holders who have requested the maintaining of such effectiveness in order to
continue with the distribution,  in such proportions as they may agree upon. The
Company's obligation to effect the registration or to maintain the effectiveness
of such  registration  will be  conditioned in each case on the receipt by it of
satisfactory  undertakings by such holders to bear such expenses,  if any, as by
the terms  hereof are to be borne by them,  and the receipt from each of them as
to such  information  regarding  the  securities  held by them and the  intended
method of  disposition  thereof as the Company shall  reasonably  request and as
shall be required in connection with the action to be taken by the Company.  The
holder of Registrable Shares will agree to abide by notice provisions reasonably
requested by the Company to avoid sales in the open market  during any period of
registration.

         IN WITNESS WHEREOF, Waste Recovery,  Inc. has caused this instrument to
be signed by its duly authorized officer, and its corporate seal to be imprinted
hereon and attested by the  signature of its  Secretary or one of its  Assistant
Secretaries.

Dated as of March 15, 1996                           WASTE RECOVERY, INC.
                                                     By: /s/THOMAS L. EARNSHAW
                                                         THOMAS L. EARNSHAW
                                                         President and Chief
                                                         Executive Officer
[SEAL]

Attest:
         /s/JOHN E. COCKRUM
         Secretary





                                    EXHIBIT A


                     FORM FOR EXERCISING ELECTION TO CONVERT

The undersigned  holder of the attached 18% Convertible  Subordinated  Debenture
due January 31, 1997 surrenders $ _______________  aggregate principal amount of
the  Debenture  for  conversion  on the  terms and  conditions  set forth in the
Debenture.  Accrued but unpaid  interest shall _____ shall not _____ (check one)
be converted. It is requested that the shares issuable upon conversion be issued
to the following person or persons:

             Name                                     Address

________________________________         _________________________________

________________________________         _________________________________


________________________________
SSN or Tax I.D. #

Date:___________________________         _________________________________
                                            Signature of Registeres Owner

                                         _________________________________
                                          Printed Name of Registered Owner


          [Instructions: If the shares are to be issued to any person other than
          the  Registered  Owner,   complete  the  information  above  for  such
          assignee,  and  complete  an  assignment  as pr Exhibit B.  Otherwise,
          complete  the  above  information  as it  pertains  to the  Registered
          Owner.]






                                    EXHIBIT B


                               FORM OF ASSIGNMENT


For value received, I sell, assign, and transfer to  ___________________________
whose  address  is  __________________  ,  ______________________________  , the
attached  Debenture  standing  in my  name  on the  books  of the  Company,  and
irrevocably appoint the Secretary of the Company as my attorney to transfer such
Debenture on the books of the Company, with full power of substitution.

         The Tax I.D. # of such assignee is _______________________________. 



Date:_______________________              ___________________________________
                                             Signature of Registered Owner
                                                       (Assignor)

                                          ___________________________________
                                            Printed Name of Registered Owner
                                                       (Assignor)
                                    (Principal Financial and Accounting Officer)