Document:

Exhibit 10.6

                             MUTUAL GENERAL RELEASE

      KNOW ALL MEN BY THESE PRESENTS: that, for good and valuable consideration,
the receipt and sufficiency of which is hereby acknowledged, Republic Services,
Inc., a Delaware corporation, for itself and on behalf of each of its
subsidiaries and their respective employees, officers, directors, partners,
shareholders, attorneys, agents, employees, subsidiaries, affiliates, insurers,
representatives and assigns (collectively referred to herein as the "Republic
Releasing Parties"), does hereby fully and unconditionally remise, release,
acquit, satisfy and forever discharge GreenMan Technologies, Inc., a Delaware
corporation (the "Company"), and each of the employees, officers, directors,
partners, shareholders, attorneys, agents, employees, subsidiaries, affiliates,
insurers and representatives of the Company (collectively referred to herein as
the "GreenMan Released Parties"), of and from all, and all manner of, action and
actions, cause and causes of actions, suits, debts, dues, sums of money,
accounts, reckonings, bonds, bills, specialties, covenants, contracts,
controversies, agreements, promises, variances, trespasses, damages, judgments,
executions, injuries, claims and demands whatsoever, in law or in equity
(collectively, "Claims"), which the Republic Releasing Parties ever had, and now
have, or may have against the GreenMan Released Parties, whether known or
unknown, for any Claims arising from the beginning of the world to the date
hereof; provided, however, that the Republic Releasing Parties expressly reserve
and do not release any rights of the Republic Releasing Parties against the
Company, which are specifically provided under that certain Promissory Note,
dated of even date herewith bewteen Republic Services of Georgia Limited
Partnership and the Company and having a principal balance of $150,000.00.

      FURTHER KNOW ALL MEN BY THESE PRESENTS: that, for good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the
Company, for itself and on behalf of each of its subsidiaries and their
respective employees, officers, directors, partners, shareholders, attorneys,
agents, employees, subsidiaries, affiliates, insurers, representatives and
assigns (collectively referred to herein as the "GreenMan Releasing Parties"),
does hereby fully and unconditionally remise, release, acquit, satisfy and
forever discharge Republic Services, Inc, a Delaware corporation ("Republic
Services"), and each of the employees, officers, directors, partners,
shareholders, attorneys, agents, employees, subsidiaries, affiliates, insurers
and representatives of Republic Services (collectively referred to herein as the
"Republic Released Parties"), of and from all, and all manner of, Claims, which
the GreenMan Releasing Parties ever had, and now have, or may have against the
Republic Released Parties, whether known or unknown, for any Claims arising from
the beginning of the world to the date hereof.

      Each party hereto hereby acknowledges that they read this General Release
carefully and understands its contents, and is aware that this is an agreement
not to sue the other party hereto and constitutes a complete release of
liability by it in favor of the other party as and to the extent provided
herein, and further acknowledge that the undersigned is signing this document of
his/her own free will, with full knowledge of its contents.

                       [Signatures continued on next page]

<PAGE>

      IN WITNESS WHEREOF, this Mutual General Release has been executed by or on
behalf of the parties hereto this 30th day of June, 2006.

GREENMAN TECHNOLOGIES, INC.

By:   /s/ Charles E. Coppa
      ---------------------------------
Its:  Chief Financial Officer
      ---------------------------------

Signed, sealed & delivered in the presence of:

/s/ Heidi J. Maust
----------------------------
Witness

STATE OF    Minnesota
            -----------------
COUNTY OF   Scott
            -----------------

      I HEREBY CERTIFY that on this day, before me, a notary or officer duly
authorized in the State of Minnesota to take acknowledgments, the foregoing
instrument was executed and acknowledged before me by Charles Coppa who is (i)
personally known to me or ["(i)" is circled] (ii) has produced _____N/A____ as
identification.

      Witness my hand and seal in the county and state last aforesaid this 28th
day of June, 2006.

                                 /s/ Rahni F. Bahr
                                 ----------------------------

                                 Notary Public State of Minnesota

                                 Rahni F. Bahr
                                 ----------------------------
                                 Typed, printed or stamped name of notary public

                           [Signatures continued on next page]

                                 [NOTARY SEAL]

<PAGE>

      IN WITNESS WHEREOF, this Mutual General Release has been executed by or on
behalf of the parties hereto this 30th day of June, 2006.

REPUBLIC SERVICES, INC.

By:   /s/ David A. Barclay
      ------------------------------------
Its:  Sr. Vice President & General Counsel
      ------------------------------------

Signed, sealed & delivered in the presence of:

/s/ [Signature illegible]
----------------------------
Witness

STATE OF    Florida
            -----------------
COUNTY OF   Broward
            -----------------

      I HEREBY CERTIFY that on this day, before me, a notary or officer duly
authorized in the State of Florida to take acknowledgments, the foregoing
instrument was executed and acknowledged before me by David A. Barclay who is
(i) personally known to me or (ii) ["(i) personally known to me" is circled] has
produced _____---____ as identification.

      Witness my hand and seal in the county and state last aforesaid this 30th
day of June, 2006.

                                 /s/ Christine M. Doyle
                                 ----------------------------

                                 Notary Public State of Florida

                                 Christine M. Doyle
                                 ----------------------------
                                 Typed, printed or stamped name of notary public

                                 [NOTARY SEAL]Exhibit 10.7

                             PROMISSORY NOTE

$150,000.00                                                June 30,2006

      FOR VALUE RECEIVED, GREENMAN TECHNOLOGIES INC., a Delaware corporation
(the "Debtor"), promises to pay to the order of REPUBLIC SERVICES OF GEORGIA,
LIMITED PARTNERSHIP, a Georgia limited partnership (the "Holder"), without
offset or deduction at its office located at c/o Republic Services, Inc., 110
S.E. 6th Street, Ft. Lauderdale, FL 33301 Attn: General Counsel or at such other
address as the Holder shall specify in writing, in lawful money of the United
States of America, the principal sum of One Hundred Fifty Thousand and 00/100
Dollars ($150,000.00) or such lesser amount then outstanding, together with
interest on the unpaid principal balance hereof until paid at the rate and on
the terms hereafter provided in this note (this "Note").

      Interest shall accrue on the outstanding principal balance hereof at the
rate of ten percent (10%) per annum. Debtor shall make eleven (11) monthly
payments of $5,000.00 commencing on July 31, 2006 with a final payment on June
30, 2007 of the then-remaining unpaid principal balance of this Note, plus any
and all accrued and unpaid interest thereon, all without necessity of a demand
notice.

      The Holder has made no commitment to extend the payment of this Note
beyond the maturity date stated herein. This Note may be prepaid in whole or in
part at any time prior to the maturity date stated herein and from time to time
without premium or penalty.

      Interest payable hereunder shall in no event exceed the maximum rate of
interest permitted under the appropriate laws applicable to this Note. If the
Debtor makes payments of interest, fees or other charges however denominated,
which payments result in an interest rate hereon exceeding the maximum rate of
interest payable under applicable laws, then any such excess is hereby waived by
the Holder and shall automatically and from the date of payment be applied in
reduction of the principal balance hereof, or, if such excess is greater than
the unpaid principal amount hereof, the difference shall be paid by the Holder
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;

<PAGE>

      (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

      (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 sixty (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 hereby expressly agrees that, upon default in the payments as
set forth herein or after acceleration upon the occurrence of an Event of
Default, all as herein provided, the outstanding principal balance shall bear
interest at the rate equal to 18 percent (18%) per annum.

      Payments or prepayments on this Note shall be applied to amounts due
hereunder in such order as the Holder may determine.

      The Debtor agrees to pay all expenses, including reasonable attorney's
fees, incurred in connection with the enforcement of or in collecting this Note,
in preserving or disposing of any collateral granted as security for the payment
of this Note or in defending any action arising out of or in connection with
this Note or the execution hereof.

      The Debtor (i) waives presentment, demand, protest and notice of dishonor
and any and all lack of diligence or delays in collection or enforcement hereof,
(ii) waives all exemptions, whether homestead or otherwise, as to the obligation
evidenced by this Note, (iii) waives any right that it may have to require the
Holder to proceed against any other party or foreclose on any collateral given
to secure the payment of this Note and (iv) agrees that, without notice to any
party to this Note and without affecting any such party's liability, the Holder,
at any time or times, may grant extensions of the time for any payment due on
this Note, release any party from its obligation to make payments on this Note,
permit the renewal of this Note or permit the substitution, exchange or release
of any security for this Note.

      This Note shall be governed by the laws of the Commonwealth of
Massachusetts and shall be binding upon the Debtor and its heirs, personal
representatives, successors and assigns and shall inure to the benefit of the
Holder, its successors and assigns and any future holder hereof.

                                        2
<PAGE>

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

Witness:                               GREENMAN TECHNOLOGIES, INC., a
                                       Delaware corporation

By: /s/ Heidi J. Maust                By: /s/ Charles E. Coppa        (SEAL)
    --------------------------            -------------------------
Name: Heidi J. Maust                  Name: Charles E. Coppa
      ------------------------              -----------------------
                                      Title:          CFO
                                             -----------------------

                                        3

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