Document:

Exhibit 10.3

                                    AGREEMENT

      This Agreement is made as of the 6th day of May, 2002, by and between
Republic Services of Georgia, Limited Partnership ("RSLP"), a Georgia limited
partnership ("RSLP"), and GreenMan Technologies, Inc., a Delaware corporation
("the "Company"). For good and valuable consideration, the receipt of which is
hereby acknowledged, and intending to be legally bound, the parties hereby agree
as follows:

      1. Partial Conversion of Note. RSLP hereby irrevocably agrees to convert
$750,000 of the principal balance of that certain Promissory Note, dated
February 15, 2002, issued by the Company (the "Original Note"), into 300,000
shares (the "Shares") of the common stock, par value $.01 per share, of the
Company (the "Common Stock").

      2. Closing. The conversion of the Original Note as described in Section 1
shall be effective immediately upon the execution of this Agreement by RSLP and
the Company. Simultaneously with the execution of this Agreement, (a) RSLP shall
surrender the Original Note to the Company, duly endorsed for cancellation, (b)
the Company shall execute and deliver to RSLP a new note, identical in all
respects to the Original Note, provided only that the principal balance of such
new note shall be $750,000, and (c) the Company shall pay to RSLP all interest
that has accrued but which has not been paid on the original principal balance
of the Original Note through the date hereof. As soon as practicable after the
date of this Agreement, the Company shall cause its transfer agent to deliver to
RSLP a certificate representing the Shares, registered in the name of RSLP.

      3. Representations and Warranties of RSLP. RSLP represents and warrants to
the Company that:

            (a) Investment Intent. RSLP is acquiring the Shares for investment
for the account of RSLP and not for the account of any other person, and not
with a view toward resale or other distribution thereof. RSLP has no contract,
undertaking, understanding, agreement or arrangement, formal or informal, with
any person to sell, transfer or pledge to any person the Shares, or any portion
thereof, or any interest therein or any rights thereto. RSLP has no present
plans to enter into any such contract, undertaking, agreement or arrangement.
RSLP understands that the Shares have not been and will not be (other than as
set forth in Section 5 below), registered under the Securities Act of 1933, as
amended (the "Securities Act"), and applicable state securities laws and,
therefore, cannot be resold unless they are subsequently registered under the
Securities Act and applicable state securities laws or unless an exemption from
such registration is available. RSLP understands and agrees that the Company
does not have any present intention and is under no obligation to register any
of the Shares (other than as set forth in Section 5 below), whether upon initial
issuance or upon any transfer thereof under the Securities Act and applicable
state securities laws, and that Rule 144 under the Securities Act may not be
available as a basis for exemption from registration.
<PAGE>

            (b) Restrictive Legend. RSLP understands and agrees that, until
registered under the Securities Act or transferred pursuant to the provisions of
Rule 144, all certificates evidencing any of the Shares, whether upon initial
issuance or upon any transfer thereof, shall bear a legend, prominently stamped
or printed thereon, reading substantially as follows:

      These securities have not been registered under the Securities Act of
      1933, as amended (the "Securities Act"), or applicable state securities
      laws. These securities have been acquired for investment and not with a
      view to their distribution or resale, and may not be sold, pledged, or
      otherwise transferred without an effective registration statement for such
      securities under the Securities Act and applicable state securities laws,
      or an opinion of counsel satisfactory to the Company to the effect that
      such registration is not required.

            (c) Access to Information. RSLP has read and reviewed, and is
familiar with, the reports and proxy statement filed by the Company with the
Securities and Exchange Commission (the "Commission") since September 30, 2001
(the "SEC Documents"). RSLP confirms and acknowledges that RSLP has not received
or reviewed any forecasts or financial projections from the Company, nor any
other representations as to the future financial performance of the Company, and
that RSLP has agreed to convert the Original Note into the Shares as provided
for herein without having received any such forecasts or financial projections.
RSLP has not relied on any representations, warranties or statements by or on
behalf of the Company other than as set forth in this Agreement.

            (d) Knowledge and Experience. RSLP is capable of evaluating the
merits and risks of the purchase of the Shares. RSLP has the capacity to protect
its own interests in connection with the acquisition of the Shares by reason of
RSLP's business or financial experience.

            (e) Suitability. The acquisition of the Shares by RSLP is consistent
with its general investment objectives. RSLP understands and has fully
considered the risks of this investment and understands that (i) this investment
is suitable only for an investor who is able to bear the economic consequences
of losing its entire investment, (ii) the acquisition of the Shares is a
speculative investment that involves a high degree of risk and (iii) the
transfer of the Shares by RSLP is restricted by federal and state securities
laws and, accordingly, it may not be possible for RSLP to liquidate its
investment in the event of an emergency. RSLP has no present need for liquidity
in connection with the acquisition of the Shares hereunder. RSLP can bear the
economic risks of this investment and can afford a complete loss of such
investment.

            (f) Accredited Investor Status. RSLP is an "accredited investor" as
such term is defined in Rule 501 of Regulation D promulgated under the
Securities Act.

      4. Representations and Warranties of Company. The Company represents and
warrants to RSLP that:

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<PAGE>

            (a) Organization. The Company is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware,
and has all requisite corporate power and authority to own, lease and operate
its properties and to carry on its business as it is now being conducted.

            (b) Authority. The execution and delivery of this Agreement, and the
consummation of the transactions contemplated hereby, have been duly and validly
authorized by all necessary corporate action on the part of the Company, and
this Agreement constitutes the valid and legally binding obligation of the
Company, enforceable in accordance with its terms.

            (c) SEC Documents. As of their respective dates, the SEC Documents
complied in all material respects with the requirements of the Securities
Exchange Act of 1934, as amended, and the rules and regulations of the
Commission thereunder applicable to such SEC Documents, and none of the SEC
Documents when filed contained any untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary to
make the statements therein, at the time in light of the circumstances under
which they were made, not misleading.

            (d) Absence of Material Adverse Changes. Since December 31, 2001,
there has not been any material adverse change in the Company's financial
condition, business or prospects, or any material damage, deterioration or
destruction to or of any of the Company's assets, which damage, deterioration or
destruction is not covered by insurance. (e) Authorized Shares. The Shares to be
delivered to RSLP pursuant to this Agreement are duly authorized and, upon such
delivery in accordance with the terms of this Agreement, will be validly issued,
outstanding, fully paid and nonassessable.

      5. Registration Rights.

            (a) General. For a period of two years from the date of this
Agreement, if at any time the Company shall determine to register in a public
offering for its own account (and not the account of selling stockholders) under
the Securities Act any of its Common Stock, the Company shall send to RSLP
written notice of such determination. If, within 15 days after receipt of such
notice, RSLP shall so request in writing, the Company shall use its best efforts
to include in such registration statement all or any part of the Shares RSLP
requests to be registered. This right shall not apply to any registration of
shares of Common Stock on Form S-4 or Form S-8 (or their then equivalents)
relating to shares of Common Stock to be issued by the Company in connection
with any acquisition of any entity or business, or shares of Common Stock
issuable in connection with any stock option or other employee benefits plan,
respectively.

            (b) Underwriting Limitations. In connection with any offering
involving an underwriting of Common Stock to be issued by the Company for the
account of the

                                       3
<PAGE>

Company, (i) the Company may condition participation by RSLP on participation in
the underwriting and (ii) if the managing underwriter shall impose a limitation
on the number of shares of such Common Stock which may be included in any such
registration statement because, in its judgment, such limitation is necessary to
effect any orderly public distribution of the Common Stock and to maintain a
stable market for the securities of the Company, then the Company shall be
obligated to include in such registration statement only such limited portion
(which may be none) of the Shares with respect to which RSLP and all other
selling stockholders have requested inclusion thereunder.

            (c) Market "Stand-off" Agreement. RSLP agrees, if requested by an
underwriter of Common Stock (or other securities) of the Company, not to sell or
otherwise transfer or dispose of any Common Stock (or other securities) of the
Company held by RSLP during the 180-day period following the effective date of a
registration statement of the Company filed under the Securities Act; provided,
however, that all officers and directors of the Company enter into similar
agreements requiring a 180-day market stand-off. If requested by the
underwriters, RSLP shall execute a separate agreement to the foregoing effect.
The Company may impose stop-transfer instructions with respect to the securities
subject to the foregoing restriction until the end of said 180-day period. The
provisions of this Section 5(c) shall be binding upon any transferee who
acquires Shares.

            (d) Expenses. The Company shall bear all costs and expenses of each
registration under this Agreement, including, but not limited to, printing and
accounting expenses and reasonable legal expenses for one special counsel
retained by shareholders (including RSLP) registering Shares or other
securities, Commission and National Association of Securities Dealers, Inc.
filing fees and expenses, and "blue sky" fees and expenses; provided, however,
that the Company shall have no obligation to pay or otherwise bear any portion
of the underwriters' commissions or discounts attributable to the Shares.

            (e) Expiration of Registration Rights. The obligations of the
Company under this Section 5 to register Shares shall expire and terminate (i)
with respect to any Shares sold pursuant to a registration statement under the
Securities Act or Rule 144 of the Securities Act, (ii) with respect to any
Shares, when such Shares are available for sale and can be sold (whether or not
so sold) in the volume and manner desired by RSLP pursuant to Rule 144 of the
Securities Act, and (iii) with respect to all Shares, when such Shares are
available for sale and can be sold (whether or not so sold) pursuant to Rule
144(k) of the Securities Act, or any similar rule promulgated by the Commission
permitting the resale of restricted securities without the necessity of a
registration statement under the Securities Act.

      6. Successors and Assigns. Except as otherwise expressly provided herein,
this Agreement shall bind and inure to the benefit of the Company and RSLP and
their respective successors and assigns. Notwithstanding the foregoing, the
registration rights provided in Section 5 are personal to RSLP and are not
transferable without the prior consent of the Company. Any transfer of such
rights without the consent of the Company shall be void.

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<PAGE>

      7. Entire Agreement. This Agreement and the other writings referred to
herein or delivered pursuant hereto which form a part hereof contain the entire
agreement between the parties with respect to the subject matter hereof and
supersede all prior and contemporaneous arrangements or understandings, whether
written or oral, with respect thereto.

      8. Notices. All notices provided for in this Agreement shall be given in
writing and shall be effective when either served by personal delivery, express
overnight courier service, electronic facsimile transmission, or by first class
mail, postage prepaid, addressed to the parties at the addresses set forth
beneath their signatures below, or to such other address or addresses as either
party may later specify by written notice to the other.

      9. Changes. This Agreement may be amended or modified only by a written
instrument executed by the Company and RSLP.

      10. Counterparts. This Agreement may be executed by the parties on
separate counterparts, each of which, when so executed and delivered, shall be
an original but all of which together shall constitute one and the same
instrument.

      11. Severability. Any provision of this Agreement that is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

      12. Governing Law; Waiver of Jury Trial. This Agreement shall be governed
by and construed in accordance with (a) the laws of The Commonwealth of
Massachusetts applicable to contracts made and to be performed wholly therein,
and (b) the General Corporation Law of the State of Delaware and (c) the federal
laws of the United States of America. The Company and RSLP hereby irrevocably
waive any right to a trial by jury in any action, proceeding or counterclaim
arising out of or relating to this Agreement.

      EXECUTED as of the date first set forth above.

REPUBLIC SERVICES OF GEORGIA,               GREENMAN TECHNOLOGIES,
LIMITED PARTNERSHIP                                  INC.

By: ____________________________            By: ____________________________

Name: _________________________             Name: Charles E. Coppa

Title:  _________________________           Title: Chief Financial Officer

Address: 110 S.E. 6th Street, Suite 2800    Address: 7 Kimball Lane, Building A
         Ft. Lauderdale, FL 33301                    Lynnfield, MA  01940

                                       5Exhibit 10.4

                                 PROMISSORY NOTE

$743,750.00                                                          May 6, 2002

      FOR VALUE RECEIVED, the undersigned, GreenMan Technologies Inc., a
Delaware corporation (the "Debtor"), hereby promises to pay to Republic Services
of Georgia, Limited Partnership ("RSLP"), a Georgia limited partnership (as
successor to United Waste Service, Inc.) (the "Holder"), and whose address is
c/o Republic Services, Inc., 110 S.E. 6th Street, Suite 2800, Ft. Lauderdale, FL
33301, the principal sum of Seven Hundred Forty Three Thousand Seven Hundred and
Fifty Dollars ($743,750.00) or such lesser principal amount then outstanding,
together with all accrued and unpaid interest thereon on May 31, 2007. Interest
on the principal amount of this Note will accrue from and including the date
hereof until and including the date such principal amount is paid, at a rate
equal to ten percent (10%) per annum. Debtor shall make fifty eight (58) monthly
principal payments of $3,125 plus interest commencing June 1, 2002 with a final
payment due May 31, 2002 of all remaining unpaid principal balance of this Note,
plus any and all accrued and unpaid interest. All payments shall be made at the
principal office of the Holder or at such other place as the legal holder may
designate from time to time in writing to the Debtor.

      The outstanding balance of this Note shall be rendered immediately due and
payable, without the necessity of a demand notice, in case of any of the
following acts (each, an "Event of Default"):

      (a)   entry of any judgment or order against the Debtor for the payment of
            money, if the same is not satisfied or enforcement proceedings are
            not stayed within sixty (60) days or if, within sixty (60) days
            after the expiration of any such stay, the judgment or order is not
            dismissed, discharged or satisfied;

      (b)   appointment of a receiver, trustee, custodian or similar official,
            for the Debtor or any property or assets of the Debtor;

      (c)   conveyance of any or all assets to a trustee, mortgagee or
            liquidating agent or assignment for the benefit of creditors by the
            Debtor;

      (d)   commencement by the Debtor of any voluntary proceeding under any law
            or any jurisdiction, now or hereafter in force, relating to
            bankruptcy, insolvency, renegotiation of outstanding indebtedness,
            arrangement or otherwise to the relief of debtors or the
            readjustment of indebtedness; or
<PAGE>

      (e)   commencement by any creditor of any involuntary proceeding against
            the Debtor under any law or any jurisdiction, now or hereafter in
            force, relating to bankruptcy, insolvency, renegotiation of
            outstanding indebtedness, arrangement or otherwise to the relief of
            debtors or the readjustment of indebtedness, which proceeding is not
            dismissed or discharged within 60 days after commencement.

Notwithstanding anything contained herein to the contrary, upon the occurrence
of any such Event of Default, the entire outstanding amount of principal and
interest of this Note shall become immediately due and payable, without
presentment, demand, protest or other notice of any kind, all of which are
hereby expressly waived.

      The Debtor may prepay this Note without penalty, in whole or in part, at
any time prior to maturity. The Holder agrees that:

      (a)   if the Debtor prepays the Note in its entirety prior to the first
            anniversary of this Note, the Debtor would receive a discount equal
            to fifteen percent (15%) of the then outstanding principal balance
            of the Note;

      (b)   if the Debtor prepays the Note in its entirety prior to the second
            anniversary of this Note, the Debtor would receive a discount equal
            to ten percent (10%) of the then outstanding principal balance of
            the Note; and

      (c)   if the Debtor prepays the Note in its entirety prior to the third
            anniversary of this Note, the Debtor would receive a discount equal
            to five percent (5%) of the then outstanding principal balance of
            the Note.

      Any permitted prepayment of principal by the Debtor will be accompanied by
payment of all accrued and unpaid interest on the principal sum being repaid.
This Note is being issued pursuant to a Stock Repurchase Agreement of even date
herewith by and between Debtor and Holder. In the event that Debtor shall have
any claims against Holder pursuant to such Stock Repurchase Agreement, then
Debtor shall have the right to offset such claims against amounts payable
pursuant to this Note.
<PAGE>

      The Debtor agrees to pay all costs, charges and expenses incurred by the
Holder and its assigns (including, without limitation, costs of collection,
court costs, and reasonable attorneys' fees and disbursements) in connection
with the successful enforcement of the Holder's rights under this Note (all such
costs, charges and expenses being herein referred to as "Costs"). Presentment
for payment, demand, protest, notice of protest and notice of nonpayment are
hereby waived. The Debtor agrees that any delay on the part of the Holder in
exercising any rights hereunder will not operate as a waiver of such rights, and
further agrees that any payments received hereunder will be applied first to
Costs, then to interest, and the balance to principal. The Holder shall not by
any act, delay, omission, or otherwise be deemed to waive any of its rights or
remedies, and no waiver of any kind to enforce this Note shall be valid unless
in writing and signed by the Holder.

      This Note applies to, inures to the benefit of, and binds the successors
and assigns of the parties hereto. This Note is not negotiable or transferable
to any other holder without the written consent of the Debtor. This Note is made
under and shall be governed by the internal laws of the Commonwealth of
Massachusetts, without giving effect to any choice of law or conflicts of law
provision or rule that would cause the application of internal laws of any other
jurisdiction.

      IN WITNESS WHEREOF, the Debtor has executed this Note as an instrument
under seal as of the date first written above.

WITNESS:                    DEBTOR:

----------------            --------------------------
Charles E. Coppa            GreenMan Technologies Inc.
                            Robert H. Davis, President/Chief Executive Officer

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