Document:

EXHIBIT 10.72
                                                                   -------------

                          KLASS PARTNERS LTD. AGREEMENT
                                FOR AMENDEMENT OF
                            CXI BRIDGE LOAN DOCUMENTS

         1. Transaction: (i) Securities Purchase Agreement by and among
Commodore Environmental Services, Inc., a Delaware corporation ("COES")
Commodore Applied Technologies, Inc., a Delaware corporation ("CXI"), and
Mathers Associates, Klass Partners, Ltd., Jon Paul Hannesson and Stephen A.
Weiss, Esq. (individually an "Investor" and collectively, the "Investors"), (ii)
corresponding 12% Senior Secured Promissory Notes due February 12, 2001 (the
"Notes") in the aggregate principal amount of up to $500,000 issued to the
Investors in the proportion shown on Schedule A annexed hereto, (iii) the
Security Agreement (iv) the Registration Rights Agreement, (v) the "DRM
Undertaking", and all other documents executed and delivered incident thereto,
all dated as of November 13, 2000 (collectively the "Bridge Loan Documents").

         2. Amendments: Notwithstanding anything to the contrary in the Bridge
Loan Documents, Klass Partners Ltd. ("Klass") hereby agrees to amend its portion
of the Bridge Loan Documents as follows:

                  (a). The Maturity Date (as defined in the Notes) for the Klass
                  Note will be extended to shall be due and payable on or before
                  May 1, 2001.

         3. Holders Representations. Klass will, and hereby does, represent
that: (i) they are and since November 13, 2000, have been, the holders of the
Notes, (ii) they have full power and authority to agree to the terms herein, and
to make execute and deliver this Memorandum of Understanding and (iii) if
subsequent definitive agreements are necessary to implement this Memorandum of
Understanding, at the time thereof, they will have full power and authority to
agree to the terms herein, and to make execute and deliver such definitive
agreements.

         4. No default. Klass hereby acknowledges and agrees that when each
party to this Agreement has executed and delivered this Agreement to each other
party and when each of the conditions precedent set forth below have been met,
the Notes and all other Bridge Loan Documents shall be deemed to be in
compliance as of the Effective Date hereof. As of May 1, 2001, if (i) CXI has
not paid the Klass Notes and/or (ii) the S-3 registration statement that CXI is
about to file has not been made effective, the Klass shall have all rights and
remedies that it has or had as though this Agreement had never been entered
into.

         5. Incorporation by reference. All of the representations and
warranties made by Klass to the Security Purchase Agreement are incorporated
herein by reference and are hereby deemed to be made to each other party as

<PAGE>

fully as if set forth at length herein. Except as otherwise set forth herein or
as agreed to by the other Investors, the Bridge Loan Documents shall remain in
full force and effect as of their original effective date according to the terms
contained therein and binding upon the parties thereto and hereto.

         6. Counterpart, Delivery and Fax Signatures. This Agreement may be
executed in any number of counterparts, each of which shall be deemed an
original, but all of which taken together shall constitute one and the same
instrument. The direct or indirect delivery by hand delivery, mail, courier,
facsimile or otherwise, by any party hereto to any other party hereto bearing
the facsimile signature of such party shall be deemed to be execution and
delivery of an original counterpart version of this Memorandum of Understanding
and shall be deemed to be effective and binding upon such person.

IN WITNESS WHEREOF, and intending to be legally bound, Klass has executed and
delivered this Memorandum of Understanding this 16th day of April 2001 and made
effective as of the 5th day of April 2001 (the "Effective Date").

                                            KLASS PARTNERS, LTD.

                                            /s/ MISHA KRAKOWSY
                                            ------------------------------------
                                            Misha Krakowsky, President

                                            COMMODORE APPLIED TECHNOLOGIES, INC.

                                            /s/ SHELBY T. BREWER
                                            ------------------------------------

                                            Shelby T. Brewer, Chairman & C.E.O.

                     [Remainder of page intentionally blank]

<PAGE>

                                   Schedule A

                                   INVESTORS
                                   ---------

<TABLE>
<CAPTION>

    -------------------------------------------- -------------------------------- -----------------------------------
                                                                                    Number of New Warrants for CXI
                 Name and Address:                 Principal Amount Invested:               Common Stock:

    -------------------------------------------- -------------------------------- -----------------------------------
    <S>                                                    <C>                                 <C>
    Mathers Associates
    230 Mathers Road                                       $150,000                            300,000
    Ambler, PA 19002
    -------------------------------------------- -------------------------------- -----------------------------------
    Klass Partners, Ltd.
    391 Brooke Avenue                                       250,000                            500,000
    Toronto, Ontario M5M 2L5
    Canada
    -------------------------------------------- -------------------------------- -----------------------------------
    Jon Paul Hannesson
    150 East 58th Street                                     75,000                            150,000
    Suite 3410
    New York, New York 10155
    -------------------------------------------- -------------------------------- -----------------------------------
    Stephen A. Weiss
    200 Park Avenue, 14th Floor                              25,000                             50,000
    New York, NY 10166
    -------------------------------------------- -------------------------------- -----------------------------------

    -------------------------------------------- -------------------------------- -----------------------------------
    Total . . . .                                          $500,000                          1,000,000
    -------------------------------------------- -------------------------------- -----------------------------------
</TABLE>EXHIBIT 10.73
                                                                   -------------

                                       AB

                      Commodore Applied Technologies, Inc.
                         212 Jamieson Avenue, Suite 1406
                              Alexandria, VA 22314
                Telephone (703)-567-1284 Facsimile (703)-566-7526
--------------------------------------------------------------------------------

                          WARRANT TO PURCHASE SHARES OF
              COMMON STOCK OF COMMODORE APPLIED TECHNOLOGIES, INC.

                                                                         4/18/01
                                                                  Alexandria, VA

THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE OF THIS
WARRANT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(THE "SECURITIES ACT") AND SUCH SECURITIES MAY NOT BE SOLD, OFFERED FOR SALE,
PLEDGED OR HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE
CORPORATION THAT SUCH REGISTRATION IS NOT REQUIRED

                       VOID AFTER 5:00 P.M., NEW YORK TIME
                                   ON 4/16/03

         THIS CERTIFIES THAT for value received, Mathers Associates, or its
registered permitted assigns (hereinafter collectively referred to as the
"Holder"), may subscribe for and purchase, subject to the terms and conditions
hereof, from Commodore Applied Technologies, Inc., a Delaware corporation (the
"Company"), 300,000 shares of Common Stock of the Company, par value $0.001 per
share (the "Common Stock"), at any time during the period (the "Exercise
Period") commencing at 9:00 a.m. EST on 4/16/01 (the "Commencement Date") and
ending at 5:00 p.m. EST, on 4/16/03, a date which is two (2) years from the
Commencement Date (the "Expiration Date"), at an exercise price per share (the
"Exercise Price") which shall be equal to ($0.22) per share. The number of
shares of Common Stock issuable upon exercise of its Warrant (the "Warrant
Shares"), the Exercise Price, and the kind of securities issuable upon exercise
of this Warrant, shall be subject to adjustment from time to time upon the
occurrence of certain events as set forth below.

         Certain Definitions.       As used herein:
         --------------------

         (a) the term `Warrant Shares" shall mean the shares of Common Stock
         issuable upon exercise of this Warrant, as adjusted from time to time,

<PAGE>

         1.       Exercise Price and Expiration.
                  -----------------------------

                  (a) This Warrant may be exercised in whole or in part on any
Business Day (as such term is hereinafter defined) at any time during the
Exercise Period upon surrender to the Company, at its address for notices set
forth in Section 7 of this Warrant (or at such other office of the Company, if
any, or such other office of the Company's duly authorized agent for such
purpose, as may be maintained by the Company for such purpose and so designated
by the Company by written notice to the Holder prior to such exercise), together
with the following: (i) a duly completed and executed Notice of Warrant Exercise
in the form annexed hereto, and (ii) payment of the full Exercise Price for this
Warrant or the portion thereof then being exercised. This Warrant and all rights
and options hereunder shall expire on, and shall be immediately wholly null and
void to the extent the Warrant is not properly exercised prior to the Expiration
Date. As used in this Warrant the term "Business Day" shall mean the time period
between 9:00 a.m. EST and 5:00 p.m. EST on any day other than any Saturday,
Sunday, or other day on which commercial banks in New York, New York are
required or are authorized by law to close.

                  (b) Such Exercise Price shall be paid in lawful money of the
United States of America by bank cashier's check or by wire transfer of
immediately available funds to such account as shall have been designated in
writing by the Company to the Holder from time to time.

                  (c) Upon the Holder's surrender of the Warrant and payment of
the Exercise Price as set forth above, the Company shall promptly issue and
cause to be delivered to the Holder a certificate or certificates for the total
number of whole shares of Common Stock for which this Warrant is then so
exercised, as the case may be (adjusted to reflect the effect of the
anti-dilution provisions contained in Section 2 of this Warrant, if any) in such
denominations as are requested for delivery to the Holder, and the Company shall
thereupon deliver such certificates to the Holder. The Holder shall be deemed to
be the Holder of record of the shares of Common Stock issuable upon such
exercise, notwithstanding that the stock transfer books of the Company shall
then be closed or that certificates representing such shares of Common Stock
shall not then be actually delivered to the Holder. If, at the time this Warrant
is exercised, a registration statement under the Securities Act is not then in
effect to register under said Securities Act the Warrant Shares issuable upon
exercise of this Warrant (together with any applicable state securities law
registrations), the Company may require the Holder to make such representations,
and may place such legends on certificates representing the Warrant Shares, as
may be reasonably required in the opinion of counsel to the Company to permit
the Warrant Shares to be issued without such registration, unless the Company
receives an opinion of counsel reasonably satisfactory to counsel to the Company
to the effect that said securities may be freely traded without registration
under the Securities Act.

                  (d) If the Holder shall exercise this Warrant with respect to
less than all of the Warrant Shares that may then be purchased under this
Warrant, having taken into account any prior exercise of the Warrant, the
Company shall promptly execute and deliver to the Holder a new warrant in the
form of this Warrant for the balance of such Warrant Shares.

         2.       Certain Anti-dilution Adjustments.
                  ---------------------------------

                  (a) If the Company shall (i) pay a dividend or make a
distribution to Holders of shares of Company Common Stock in the form of
additional shares of Common Stock, (ii) subdivide or split or reverse split or
consolidate the outstanding shares of Common Stock into a larger or smaller
number of shares, (iii) effect an increase or decrease in the number of shares
of Common Stock without consideration, or (iv) effect a re-capitalization which
shall reclassify the outstanding shares of Common Stock into one or more classes
of Common Stock, the number of shares of Common Stock issuable upon exercise of
this Warrant and the Exercise Price shall be equitably and proportionately
adjusted immediately following the occurrence of any such event, and the Holder
of record of this Warrant shall be given notice of the same at such Holder's
address in the Company's books and records. An adjustment made pursuant to this
Section shall become effective immediately after the record date in the case of
a dividend or distribution and immediately after the effective date in the case
of a subdivision, split, combination or reclassification; provided, if such
record date shall have been fixed and such dividend is not fully paid or if such

                                       2

<PAGE>

distribution is not fully made on the date fixed therefor, the exercise price
shall be recomputed accordingly as of the close of business on such record date
and thereafter such exercise price in effect shall be as adjusted pursuant to
this Section as of the time of actual payment of such dividend or distribution.

                  (b) Whenever there shall be an adjustment as provided in this
Section 2, the Company shall promptly cause written notice thereof to be sent by
registered mail, postage prepaid, to the Holder, at its address as it shall
appear in the Warrant Register, which notice shall be accompanied by an
officer's certificate setting forth the number of Warrant Shares purchasable
upon the exercise of this Warrant and the Exercise Price after such adjustment
and setting forth a brief statement of the facts requiring such adjustment and
the computation thereof, which officer's certificate shall be conclusive
evidence of the correctness of any such adjustment absent manifest error.

         3.       Mergers; Consolidations and Reclassifications.
                  ---------------------------------------------

                  (a) In case of any consolidation with or merger of the Company
with or into another corporation (other than a merger or consolidation in which
the Company is the surviving or continuing corporation), or in case of any sale,
lease, or conveyance to another corporation of the property and assets of any
nature of the Company as an entirety or substantially as an entirety, such
successor, leasing, or purchasing corporation, as the case may be, shall (i)
execute with the Holder an agreement providing that the Holder shall have the
right thereafter to receive upon exercise of this Warrant solely the kind and
amount of shares of stock and other securities, property, cash, or any
combination thereof receivable upon such consolidation, merger, sale, lease, or
conveyance by a holder of the number of shares of Common Stock for which this
Warrant might have been exercised immediately prior to such consolidation,
merger, sale, lease, or conveyance and (ii) make effective provision in its
certificate of incorporation or otherwise, if necessary, to effect such
agreement. Such agreement shall provide for adjustments, which shall be as
nearly equivalent as practicable to the adjustments in Section 2.

                  (b) In case of any reclassification or change of the shares of
Common Stock issuable upon exercise of this Warrant (other than a change in par
value or from no par value to a specified par value, or as a result of a
subdivision or combination, but including any change in the shares into two or
more classes or series of shares), or in case of any consolidation or merger of
another corporation into the Company in which the Company is the continuing
corporation and in which there is a reclassification or change (including a
change to the right to receive cash or other property) of the shares of Common
Stock (other than a change in par value, or from no par value to a specified par
value, or as a result of a subdivision or combination, but including any change
in the shares into two or more classes or series of shares), the Holder shall
have the right thereafter to receive upon exercise of this Warrant solely the
kind and amount of shares of stock and other securities, property, cash, or any
combination thereof receivable upon such reclassification, change,
consolidation, or merger by a holder of the number of shares of Common Stock for
which this Warrant might have been exercised immediately prior to such
reclassification, change, consolidation, or merger. Thereafter, appropriate
provision shall be made for adjustments which shall be as nearly equivalent as
practicable to the adjustments in Section 2.

                  (c) The above provisions of this Section 3 shall similarly
apply to successive reclassifications and changes of shares of Common Stock and
to successive consolidations, mergers, sales, leases, or conveyances.

         4.       Certain Representations of the Company.
                  --------------------------------------

         Throughout the Exercise Period, the Company has and will continue to
have (i) all requisite power and authority to issue this Warrant and the Warrant
Shares, and (ii) sufficient authorized and unissued securities of Common Stock
to permit exercise of this Warrant.

                                       3

<PAGE>

         5.       Certain Covenants of the Company.
                  --------------------------------

                  (a) The Company shall take such steps as are necessary to
cause the Company to continue to have sufficient authorized and unissued shares
of Common Stock reserved in order to permit the exercise of the unexercised and
un-expired portion of this Warrant, if any.

                  (b) The Company covenants and agrees that all Warrant Shares
issued upon the due exercise of this Warrant will, upon issuance in accordance
with the terms hereof, be duly authorized, validly issued, fully paid and
non-assessable and free and clear of all taxes, liens, charges, and security
interests created by the Company with respect to the issuance thereof.

                  (c) The Company will pay all documentary stamp taxes, if any,
attributable to the initial issuance of Warrant Shares upon the exercise of this
Warrant; provided, that the Company shall not be required to pay any tax which
may be payable in respect of any transfer involved in the issue of this Warrant
or of any certificates for Warrant Shares in a name other than that of the
Holder upon the exercise of this Warrant, and the Company shall not be required
to issue or deliver such certificates unless or until the person or persons
requesting the issuance thereof shall have paid to the Company the amount of
such tax, or shall have established to the satisfaction of the Company that such
tax has been paid.

                  (d) This Warrant and, when so issued, the shares of Common
Stock which may be issued upon exercise of the Warrants, will have been issued
pursuant to an available exemption from registration under the Securities Act.

                  (e) The Company covenants and agrees that if it fails (i) to
register the Warrant Shares as provided in a Registration Rights Agreement
between the Holder and the Company, dated of even date herewith, or (ii) to
issue the shares of Common Stock upon the proper exercise of the Warrant, then
the Holder may immediately commence an action for specific performance.

         6. No Shareholder Rights. No Holder of this Warrant shall, as such, be
entitled to vote or be deemed the holder of Common Stock or any other kind of
securities of the Company, nor shall anything contained herein be construed to
confer upon the Holder the rights of a shareholder of the Company or the right
to vote for the election of directors or upon any matter submitted to
shareholders at any meeting thereof, or give or withhold consent to any
corporate action or to receive notice of meetings or other actions affecting
shareholders (except as otherwise expressly provided herein), or to receive
dividends or subscription rights or otherwise, until the date of Holder's proper
exercise of this Warrant as described herein.

         7. Notices. Any notice, demand, request, waiver or other communication
under this Agreement must be in writing and will be deemed to have been duly
given (i) on the date of delivery if delivered by hand to the address of the
party specified below (including delivery by courier), or (ii) on the fifth day
after deposit in the U.S. Mail if mailed to the party to whom notice is to be
given to the address specified below, by first class mail, certified or
registered, return receipt requested, First Class postage prepaid:

to the Company:

                              Commodore Applied Technologies, Inc.
                              212 Jamieson Avenue
                              Suite 1406
                              Alexandria, VA 22314
                              Attn:  Shelby T. Brewer, Chief Executive Officer

the Holder:                   Mathers Associates
                              c/o Norbert J. Zeelander
                              230 Mathers Road
                              Amber, PA 19002

                                       4

<PAGE>

Any party may from time to time change its address for the purpose of notices to
that party by a similar notice specifying a new address, but no such change will
be deemed to have been given until it is actually received by the party sought
to be charged with its contents.

         8.       General.
                  -------

                  (a) This Warrant shall be governed by and construed in
accordance with the laws of the State of Delaware without regard to its conflict
of laws provisions.

                  (b) Section and subsection headings used herein are included
herein for convenience of reference only and shall not affect the construction
of this Warrant or constitute a part of this Warrant for any other purpose.

                  (c) This Warrant may be executed simultaneously in any number
of counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument when instruments
originally executed by each party shall have been received by the Company.

                  (d) This Warrant shall be binding upon and inure to the
benefit of the parties hereto and their respective successors, heirs and
assigns.

         IN WITNESS WHEREOF, the Company has duly executed this Warrant on and
as of the date first set forth above.

                                  COMMODORE APPLIED TECHNOLOGIES,
                                  INC.

                                  By:   /s/ SHELBY T. BREWER
                                        --------------------
                                       Shelby T. Brewer, Chief Executive Officer

                                       5

<PAGE>

                                     NOTICE
                                       OF
                                WARRANT EXERCISE

TO:  Commodore Applied Technologies, Inc.:

         The undersigned hereby irrevocably elects to exercise the Warrant and
to purchase thereunder ______ full shares of Common Stock issuable upon the
exercise of such Warrant.

         Please check the applicable method by which the undersigned elects to
exercise the Warrant:

         The Exercise Price for this warrant shall be paid by delivery of
         $___________ in cash as provided for in the Warrant.

         The undersigned requests that certificates for such Warrant Shares be
         issued in the name of:

               Name: Mathers Associates
                     ------------------

               Address: 230 Mathers Road,  Amber, PA,  19002
                        ------------------------------------

               Employer Identification Number. or S.S. No:  23-262-9222
                                                            -----------

         If such number of Warrants shall not be all the Warrants evidenced by
the Warrant document, the undersigned requests that a new document evidencing
the Warrants not so exercised issued and registered in the name of and delivered
to:

               Mathers Associates
               ------------------
               Name

               230 Mathers Road, Amber, PA,  19002
               -----------------------------------
               Address

               Employer Identification Number or Social Security No. 23-262-9222
                                                                     -----------

Date: ________________              ________________________________________
                                            Signature

                                       6

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