Document:

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                                                                     Exhibit 4.2
                               SECURITY AGREEMENT

1.   Date.      January 28, 2003

2.   Parties.   The parties to this Agreement are:

                Debtors:       EARTHFIRST TECHNOLOGIES, INCORPORATED
                                and
                               EARTHFIRST SOLID SOLUTIONS, INC.
                                and
                               EARTHFIRST NEXTGAS, INC.
                                and
                               EARTHFIRST RESOURCES, INC.
                                and
                               GIBSONTON PROPERTY, INC.

                Secured Party: FLORIDA ENGINEERED CONSTRUCTION
                                    PRODUCTS CORPORATION

3.   Grant of Security Interest. The Debtors hereby grant to the Secured Party a
security interest in the following Collateral to secure the payment and
performance of the obligations set out in this Agreement.

4.   Collateral. The property serving as Collateral and subject to the above
security interest are all furniture, fixtures, machinery, equipment, accounts
receivable, causes of action, all stock, including stock in subsidiaries, all
interests in limited liability companies and partnerships, and all other
personal property and intangible assets of the Debtors.

5.   Obligations of Debtors. The obligations of the Debtors that are subject to
this Security Agreement are the repayment of that certain Revolving Line of
Credit Promissory Note ("Promissory Note") of even date herewith, in the
principal amount of Three Million and 00/100 Dollars ($3,000,000.00) from the
Debtors in favor of Secured Party, the terms and conditions of such Promissory
Note being expressly incorporated herein.

6.   Warranties and Commitments. Debtors hereby warrant and agree to the
following:

     (a)        Title. The Debtors are the owners with the full right and
                interest in the Collateral that is subject to this Agreement,
                which is free and clear of any and all liens, claims,
                encumbrances, and the like, with the exception of any liens or
                encumbrances which have been disclosed to Secured Party. The
                Debtors have full authority to use the same as Collateral and
                agree to defend the Collateral against all other persons who, at
                any time, may claim an interest in it.

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     (b)        Negative Pledge. The Debtors agree that during the course of
                this Agreement and as long as any obligation that is subject to
                this Agreement remains outstanding the Debtors will not grant a
                security interest in the Collateral subject to this Agreement to
                any person or entity without the prior written consent of the
                Secured Party.

     (c)        Liens and Encumbrances. The Debtors agree that during the course
                of this 1 Agreement and as long as any indebtedness or other
                obligation that is subject to this Agreement remains outstanding
                the Debtors will keep the Collateral free from any and all
                liens, encumbrances, and the like.

     (d)        Assignment of Collateral. The Debtors will not assign, transfer,
                discount, sell, offer for sale, or otherwise dispose of the
                Collateral or any interest in the Collateral save as provided in
                this Security Agreement without prior written consent of the
                Secured Party.

     (e)        Taxes. The Debtors agree to pay all taxes and assessments on the
                Collateral as required and when due. Should the Debtors fail to
                do so, the Secured Party, although not required to do so, may,
                at its sole option, pay or discharge the same. Any such payment
                shall become an obligation of the Debtors which is secured by
                the collateral to this Agreement.

     (f)        Corporate Authority. The Corporate Debtors, warrant that:

                (i)    They are duly authorized and existing under the laws of
                       the State of Florida.

                (ii)   They are qualified and in good standing in all states in
                       which they are doing business.

                (iii)  The execution and performance of this Agreement:

                       (1) Are within the Debtors' corporate powers;

                       (2) Have been duly authorized; and

                       (3) Are not in contravention of any law or the Debtors'
                           charter, or any agreement or undertaking of which the
                           Debtors are a party or by which it is bound.

7.   Financing Statements and Other Documents. The Debtors agree to execute one
or more Financing Statements as determined by Secured Party and in a form
satisfactory to the Secured Party, and Secured Party is authorized to file
Financing Statements in any location deemed necessary or advisable to perfect
the Secured Party's security interest in the Collateral or proceeds. The Debtors
expressly agree to sign such Financing Statements on request of the

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Secured Party.

     The Debtors also agree to cooperate fully with the Secured Party in
executing additional instruments, documents, financing statements, amendments to
financing statements, and the like as may be deemed necessary or advisable by
the Secured Party in order to maintain and continue the security interest
created by this Security Agreement.

     The Debtors agree that a carbon, photographic or other reproduction of a
Financing Statement is sufficient as a financing statement under this Agreement.

8.   Reports, Inspections and the Like.

     (a)       The Debtors agree to the examination, auditing, and inspection of
               their books and records from time to time by the Secured Party,
               its assigns, or its agents as may be deemed necessary or
               advisable by the Secured Party in the protection of its interests
               under this Agreement. The Debtors agree to cooperate fully in
               this matter and further agree to the making of extracts and
               copies as well as to the verification of all accounts by the
               Secured Party or its agents, which includes but is not limited to
               the contracting of account debtors.

     (b)       The Debtors will furnish on request and from time to time to the
               Secured Party or its assigns trial balances on aged accounts;
               statements of accounts or commissions with customers or insurance
               carriers; and certified financial statements, including but not
               limited to, balance sheet and profit and loss statements,
               together with accountant's comments.

     (c)       The Debtors will promptly inform the Secured Party or its assigns
               of any change in directors, officers or key employees.

     (d)       The Debtors will cooperate fully with the Secured Party or its
               assigns in the furnishing of such assignments, schedules,
               documents and the like as they may deem necessary or advisable to
               the creation, perfection, maintenance or protection of their
               interest in the Collateral subject to this Agreement.

9.   Collections.

     (a)       The Debtors shall collect the accounts and other obligations
               serving as Collateral or proceeds under this Agreement and shall
               do so at the Debtors' own expense until such right of collection
               is expressly revoked by the Secured Party. Such revocation may be
               either prior or subsequent to default.

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     (b)       The Secured Party may at any time and from time to time, whether
               prior or subsequent to default:

               (i)  Notify any account Debtors or obligor of the existence of
                    this Agreement; and

               (ii) Direct such party to henceforth make payment directly to the
                    Secured Party of any and all sums then due to become due to
                    Debtors.

     Upon such notice and demand, the Secured Party's receipt of any payment
shall operate as payment from the Debtors and release of any amount so paid.

     (c)       The Secured Party is authorized to endorse in the name of the
               Debtors any item of Collateral or proceeds subject to this
               Agreement, however received.

     (d)       The Secured party may, at the Debtors' expense, enforce
               collection by suit or otherwise and may do so either in its own
               name or in the names of the Debtors, of any item of Collateral or
               proceeds subject to this Agreement. This shall include, but not
               be limited to, the right to compromise, extend or renew any
               indebtedness or to surrender, release, exchange, sell or discount
               all or any part thereof.

10.  Default. It is agreed that the following events shall constitute a default
under this Agreement:

     (a)       Non-Payment. Any failure of the Debtors to pay when due any
               obligation secured by this Agreement shall constitute a default.
               This includes, but is not limited to, any failure to pay
               principal or interest when due, failure to pay taxes and failure
               to timely pay any note or other document evidencing obligations
               contained in this Agreement.

     (b)       Nonperformance. Any failure of the Debtors, or any one of them,
               to perform or observe fully and in a satisfactory manner the
               terms of this Agreement shall constitute a default.

     (c)       Warranties and Representations that Prove False. Any warranty or
               representation made to the Secured Party in order to induce the
               extension of credit to the Debtors, whether made by the Debtors,
               or any one of them, or by others on behalf of the Debtors,
               including agents, employees, sureties, guarantor, consignors and
               the like and whether such representations are contained in this
               Agreement or in related materials, such as financial guaranties,
               or in any financial instrument, including, without limitation,
               the Promissory Note executed in conjunction with this Agreement,
               if incorrect in any material respect shall operate as a default
               under this Agreement.

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     (d)       Levy and Attachments. Seizure, attachment or levy on any property
               of the Debtors, or any of them, whether or not such property is
               covered by this Agreement, shall operate as a default under this
               Agreement.

     (e)       Insolvency and the Like. It shall operate as a default under this
               Agreement if for any reason:

               (i)   The Debtors become insolvent;

               (ii)  The Debtors become subject to any proceeding under the
                     bankruptcy or insolvency laws, including an assignment for
                     the benefit of creditors; or

               (iii) The Debtors have their property placed under the custody of
                     a receiver or trustee.

     (f)       Alteration of Debtors' Operating Conditions. Dissolution or any
               other termination of the existence of the Debtors or any
               forfeiture of their right to do business, as well as merger,
               consolidation, or the like with another, shall operate as a
               default under this Agreement.

     (g)       Unauthorized Use of Collateral or Proceeds. The assignment, sale,
               discount, transfer or use of the Collateral or its proceeds,
               except as authorized in this Agreement shall operate as a default
               under this Agreement.

11.  Accelerate on Default. In the event of any default under this Agreement,
the entire indebtedness secured by the Agreement shall become immediately due
and payable.

12.  Accelerate on Insecurity. In the event the Secured Party shall deem itself
insecure, the Secured Party may, at its option, declare the entire indebtedness
secured by this Agreement immediately due and payable. Insecurity is defined to
mean a good faith belief that the prospect of payment or performance as called
for by this Agreement has become impaired.

13.  Secured Party's Remedies. On default or acceleration, the Secured Party
shall have the following rights and remedies, which are cumulative in nature and
are immediately available to the Secured party:

     (a)       All rights and remedies provided by law, including but not
               limited to, those provided by the Uniform Commercial Code,
               especially those provided in Part 5 of Article 9;

     (b)       All rights and remedies provided in this Agreement;

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     (c)       All rights and remedies provided in the Promissory Note secured
               by this Agreement; and

     (d)       All rights and remedies provided in any other applicable security
               agreement.

     Among those rights that are specifically included:

               (i)   Right of Direct Collection. The Secured Party may, at its
                     option, notify any account Debtors of the Debtors or any
                     obligor on any obligation payable to the Debtors and
                     serving as Collateral for this Agreement to make payment
                     directly to the Secured Party, and the Debtors agree to
                     cooperate fully in executing any instruments or
                     documentation deemed necessary by Secured Party in the
                     exercise of such right.

               (ii)  Right to Control Proceeds. The Secured Party may, at its
                     option, take control of any and all proceeds from such
                     Direct Collection and apply all "Net Proceeds" to any
                     outstanding obligations of Debtors hereunder or under the
                     Promissory Note. "Net Proceeds" shall mean all proceeds
                     collected and received from any account debtor of the
                     Debtors or any obligors on any obligations payable to the
                     Debtors, after deduction of all reasonable expenses
                     incurred in collection of such accounts including, without
                     limitation, all attorneys' fees and costs incurred by
                     Secured Party or on its behalf.

               (iii) Deficiency. The exercise of the Secured Party of its right
                     of Direct Collection hereunder and in application of any
                     Net Proceeds to any obligation of Debtors hereunder shall
                     in no way operate to prejudice or affect in any way Secured
                     Party's right hereunder to at any time proceed directly
                     against Debtors.

14.  Waiver of Rights.

     (a)       All rights and remedies of the Secured Party as provided in this
               Agreement, or as found in the Promissory Note executed in
               connection with this Agreement, or arising by operation of law
               shall continue in full force and effect during the full course of
               this Agreement unless specifically waived by the Secured Party in
               a signed writing to that effect.

     (b)       Forbearance, failure, or delay on the part of the Secured Party
               in the exercise of any such right or remedy shall not constitute
               a waiver thereof and may only be effected by a specific written
               agreement to that effect which is signed by the Secured Party.

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     (c)       The exercise or partial exercise of any right or remedy shall not
               preclude the further exercise of such right or remedy.

15.  Choice of Law. This Agreement shall be governed and interpreted in
accordance with the laws of the State of Florida.

16.  Separate Agreement. This Agreement and the Promissory Note secured hereby
shall be construed together as an agreement separate and independent of any
agreements, obligations or undertakings between the Secured Party and the
Debtors, or any of them, and the existence of any claim related to such other
agreements, obligations or undertakings between or among them shall not
constitute a defense to the enforcement of this Agreement or the Promissory Note
secured hereby, such defense(s) being expressly hereby waived by Debtors.

17.  Severability. In the event that any provision of this Agreement shall be
found to be unenforceable in any legal proceeding, the remaining provisions
shall remain in force and effect.

18.  Execution. This Agreement becomes effective when signed by the Debtors.

WITNESSES:                                    DEBTORS:

                                       EARTHFIRST TECHONOLOGIES,
                                              INCORPORATED

/s/ Beverly Mercer                     By: /s/ John Stanton
-------------------------------           --------------------------------------
                                             Its: President
Beverly Mercer                                   -------------------------------
-------------------------------
[Print name]
                                       Date: 1/28/03
                                            ------------------------------------

                                       EARTHFIRST SOLID SOLUTIONS, INC.

/s/ Beverly Mercer                     By: /s/ John Stanton
-------------------------------           --------------------------------------
                                             Its: President
Beverly Mercer                                   -------------------------------
-------------------------------
[Print name]                           Date: 1/28/03
                                            ------------------------------------

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                                       EARTHFIRST NEXTGAS, INC.

/s/ Beverly Mercer                     By: /s/ John Stanton
-------------------------------           --------------------------------------
                                             Its: President
Beverly Mercer                                   -------------------------------
-------------------------------
[Print name]                           Date: 1/28/03
                                            ------------------------------------

                                       EARTHFIRST RESOURCES, INC.

/s/ Beverly Mercer                     By: /s/ John Stanton
-------------------------------           --------------------------------------
                                             Its: President
Beverly Mercer                                   -------------------------------
-------------------------------
[Print name]                           Date: 1/28/03
                                            ------------------------------------

                                       GIBSONTON PROERTY, INC.

/s/ Beverly Mercer                     By: /s/ John Stanton
-------------------------------           --------------------------------------
                                             Its: President
Beverly Mercer                                   -------------------------------
-------------------------------
[Print name]                           Date: 1/28/03
                                            ------------------------------------

                                       SECURED PARTY:

                                       FLORIDA ENGINEERED CONSTRUCTION
                                       PRODUCTS CORPORATION

/s/ Beverly Mercer                     By: /s/ John Stanton
-------------------------------           --------------------------------------
                                             Its: President
Beverly Mercer                                   -------------------------------
-------------------------------
[Print name]                           Date: 1/28/03
                                            ------------------------------------

                                       8<PAGE>

                                                                     Exhibit 4.3
                    REVOLVING LINE OF CREDIT PROMISSORY NOTE

$3,000,000.00                                                   January 28, 2003
                                                    Made, executed and delivered
                                                         in International Waters

     FOR VALUE RECEIVED, the undersigned, FLORIDA CARBON SOLUTIONS, L.L.C.,
EARTHFIRST TECHNOLOGIES, INCORPORATED and EARTHFIRST SOLID SOLUTIONS, INC.
(hereafter collectively the "Borrower"), hereby jointly and severally promise to
pay to the order of FLORIDA ENGINEERED CONSTRUCTION PRODUCTS CORPORATION
(hereinafter the "Lender"), in such coin or currency of the United States which
shall be legal tender in payment of all debts and dues, public and private, at
the time of payment, the principal sum of Three Million and 00/100 Dollars
($3,000,000.00), or so much as may be outstanding, together with interest from
and after the date hereof on the unpaid principal balance outstanding at the
rate of ten percent (10%). All principal, together with interest, shall be
payable in full upon demand.

     Borrower may prepay this Revolving Line of Credit Promissory Note (the
"Note") in whole or in part at any time during the term hereof, provided that
any such payment shall first be applied to any charges and costs then due and
payable hereunder, then to interest, and finally to principal.

     The occurrence of any default by Borrower hereunder shall entitle Lender,
at its option, to declare the then outstanding principal balance and accrued
interest hereof to be, and the same shall thereupon become, immediately due and
payable without notice to or demand upon Borrower, all of which Borrower hereby
expressly waives. If this Note is collected by or through an attorney at law,
then Borrower shall be obligated to pay, in addition to the principal balance
and accrued interest hereof, reasonable attorneys' fees and court costs at
trial, on any appeal, and in any bankruptcy proceedings.

     Time is of the essence of this Note. To the fullest extent permitted by
applicable law, Borrower, for itself and its legal representatives, successors
and assigns, expressly waives presentment, demand, protest, notice of dishonor,
notice of non-payment, notice of maturity, notice of protest, presentment for
the purpose of accelerating maturity, diligence in collection, and the benefit
of any exemption or insolvency laws.

     Wherever possible each provision of this Note shall be interpreted in such
a manner as to be effective and valid under applicable law, but if any provision
of this Note shall be prohibited or invalid under applicable law, such provision
shall be ineffective to the extent of such prohibition or invalidity without
invalidating the remainder of such provisions of this Note. No delay or failure
on the part of Lender in the exercise of any right or remedy hereunder shall
operate as a waiver thereof, nor as an acquiescence in any default, nor shall
any single or partial exercise by Lender of any right or remedy preclude any
other right or remedy.

<PAGE>

     This document has been made, executed and delivered in international
waters. This Note shall be governed by, and construed and enforced in accordance
with, the laws of the State of Florida, regardless of where made, executed or
delivered, and is intended to take effect as an instrument under seal,
constitutes a contract under the laws of the State of Florida, and shall be
enforceable in a court of competent jurisdiction in said State, without regard
to the place in which this Note is made, executed and delivered.

     This Note evidences borrowings in the principal amount of Three Million and
00/100 Dollars ($3,000,000.00) but notwithstanding such expression, the actual
indebtedness from time to time evidenced hereby shall be the sum of all advances
made to the undersigned, less the aggregate amount of all principal repayments
made by the undersigned; it being the intent and the purpose of this Note to
provide a revolving line of credit which the undersigned may draw against and
which the holder of this Note will advance from time to time, and which the
undersigned may repay in whole or in part from time to time and again draw
against, so that the principal amount outstanding hereunder may fluctuate in
accordance with such advances and repayments. Provided however, the aggregate
principal amount outstanding under this Note shall not at any time exceed the
principal sum of $3,000,000.00. Anything herein to the contrary notwithstanding
the right of the undersigned to request advances hereunder is subject to and
limited by any terms and conditions of the Agreement that may be established by
Lender from time to time at its sole discretion.

     IN WITNESS WHEREOF, Borrower has caused this Note to be duly made, executed
and delivered on the date first above written.

                                 "BORROWER"

                                 FLORIDA CARBON SOLUTIONS, L.L.C.

                                 By: /s/  John Stanton
                                    -------------------------------------------
                                          Its: Manager
                                              ---------------------------------
                                                       (Corporate Seal)

United States Territorial Waters or International Waters:
         Latitude          N27 41 83
         Longitude         W082 55 39

<PAGE>

          The foregoing instrument was acknowledged before me, Captain Dan
Coover, this 28th day of January 2003, on a vessel of which I am the Captain
located at Latitude N27 41 83 and Longitude W082 55 39 , which is located
outside the territorial limits of the State of Florida, by John Stanton as
Manager of Florida Carbon Solutions, L.L.C., who is either ___ personally known
to me or X has produced a Florida driver's license as identification.

                                 Captain's Signature: /s/ Captain Dan Coover
                                                      --------------------------
                                 Print Name:           Captain Dan Coover
                                                      --------------------------
                                 License Number:      1011115
                                                      --------------------------

                                 EARTHFIRST TECHNOLOGIES,
                                       INCORPORATED

                                 By: /s/ John Stanton
                                    --------------------------------------------
                                        Its: President
                                            ------------------------------------

                                                       (Corporate Seal)

United States Territorial Waters or International Waters:
         Latitude          N27 41 83
         Longitude         W082 55 39

     The foregoing instrument was acknowledged before me, Captain Dan Coover,
this 28th day of January 2003, on a vessel of which I am the Captain located at
Latitude N27 41 83 and Longitude W082 55 39 , which is located outside the
territorial limits of the State of Florida, by John Stanton as President of
EarthFirst Technologies, Incorporated, who is either ___ personally known to me
or X has produced a Florida driver's license as identification.

                                 Captain's Signature: /s/ Captain Dan Coover
                                                      --------------------------
                                 Print Name:           Captain Dan Coover
                                                      --------------------------
                                 License Number:      1011115
                                                      --------------------------

                                 EARTHFIRST SOLID SOLUTIONS, INC.

                                 By: /s/ John Stanton
                                    --------------------------------------------
                                       Its: President
                                           -------------------------------------

                                                       (Corporate Seal)

United States Territorial Waters or International Waters:
         Latitude          N27 41 83
         Longitude         W082 55 39

<PAGE>

     The foregoing instrument was acknowledged before me, Captain Dan Coover,
this 28th day of January 2003, on a vessel of which I am the Captain located at
Latitude N 27 41 83 and Longitude W082 55 39 , which is located outside the
territorial limits of the State of Florida, by John Stanton as President of
EarthFirst Solid Solutions, Inc., who is either ___ personally known to me or X
has produced a Florida driver's license as identification.

                                 Captain's Signature: /s/ Captain Dan Coover
                                                      --------------------------
                                 Print Name:           Captain Dan Coover
                                                      --------------------------
                                 License Number:      1011115
                                                      --------------------------

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