Document:

Exhibit 10.2

 

THIS PROMISSORY NOTE (“NOTE”) HAS NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT
BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL
REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

 

PROMISSORY NOTE

	 	(Secondment)	 
	Principal Amount: Up to $400,000	 	Dated as of September 7, 2021

 

Silver Sustainable Solutions Corp., a Delaware corporation (the “Maker”),
promises to pay to the order of Metric Finance Holdings III, LLC, or its registered assigns or successors in interest (the “Payee”),
the principal sum of four hundred thousand U.S. dollars
($400,000) or such lesser amount as shall have been advanced by Payee to Maker and shall remain unpaid under this Note upon the consummation
of an Initial Business Combination (as defined below) in lawful money of the United States of America, on the terms and conditions described
below. All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise determined by
the Maker to such account as the Payee may from time to time designate by written notice in accordance with the provisions of this Note.

 

1. Principal. To the extent drawn upon, as
set described in Section 2 below and as set forth on Schedule A, the principal balance of this Note shall be repaid to Payee
upon the date (the “Maturity Date”) on which the Maker consummates a merger, capital stock exchange, asset acquisition,
stock purchase, reorganization or similar business combination with one or more businesses (together, an “Initial Business Combination”);
provided, however, that in the event that the Maker does not consummate an Initial Business Combination, then any principal balance
remaining will be due when funds are released from Maker’s trust account and shall be paid out of funds held outside of the Maker’s
trust account available for distribution, if any.

 

2. Drawdown Requests. Maker and Payee agree
that Maker may request, from time to time, up to an aggregate of four hundred thousand U.S. dollars ($400,000) under this Note to be used
for costs and expenses related to Maker’s secondment arrangement with Payee. Principal of this Note may be drawn down from time
to time prior to the consummation of an Initial Business Combination upon request from Maker to Payee (each, a “Drawdown Request”).
Each Drawdown Request must state the amount to be drawn down, and must not be an amount greater than one-hundred thousand dollars ($100,000)
per quarter (i.e., March 31, June 30, September 30 and December 31), with such amounts to be evidenced on Schedule A hereto. Payee
acknowledges that all amounts drawn under this Note shall accrue only when such amounts are actually drawn upon, as reflected on Schedule
A, with such amounts to become due and upon each Maturity Date. No fees, payments or other amounts shall be due to Payee in connection
with, or as a result of, any Drawdown Request by Maker.

 

3. Interest. No interest shall accrue on the
unpaid principal balance of this Note.

 

4. Application of Payments. All payments shall
be applied first to payment in full of any costs incurred in the collection of any sum due under this Note, including (without limitation)
reasonable attorney’s fees, then to the reduction of the unpaid principal balance of this Note.

 

5. Events of Default. The following shall
constitute an event of default (“Event of Default”):

 

(a) Failure to Make Required Payments.
Failure by Maker to pay the principal amount due pursuant to this Note within thirty (30) days following its Initial Business Combination.

 

(b) Voluntary Bankruptcy, Etc. The
commencement by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar
law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator
(or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit
of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by Maker
in furtherance of any of the foregoing.

 

(c) Involuntary Bankruptcy, Etc.
The entry of a decree or order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under
any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee, sequestrator
(or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs,
and the continuance of any such decree or order unstayed and in effect for a period of sixty (60) consecutive days.

 

     

     

    

 

6. Remedies.

 

(a) Upon the occurrence of an Event of Default
specified in Section 4(a) hereof, Payee may, by written notice to Maker, declare this Note to be immediately due and payable, whereupon
the unpaid principal amount of this Note, and all other amounts payable hereunder, shall become immediately due and payable without presentment,
demand, protest or other notice of any kind, all of which are hereby expressly waived, anything contained herein or in the documents evidencing
the same to the contrary notwithstanding.

 

(b) Upon the occurrence of an Event of Default
specified in Sections 4(b) or 4(c), the unpaid principal balance of this Note, and all other sums payable with regard to this Note, shall
automatically and immediately become due and payable, in all cases without any action on the part of Payee.

 

7. Waivers. Maker and all endorsers and guarantors
of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard
to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits
that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds
arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of execution, exemption
from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment
obtained by virtue hereof, or any writ of execution issued hereon, may be sold upon any such writ in whole or in part in any order desired
by Payee.

 

8. Unconditional Liability. Maker hereby waives
all notices in connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees
that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any manner
by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions
of time, renewals, waivers, or modifications that may be granted by Payee with respect to the payment or other provisions of this Note,
and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s
liability hereunder.

 

9. Notices. All notices, statements or other
documents which are required or contemplated by this Note shall be: (i) in writing and delivered personally or sent by first class registered
or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile
to the number most recently provided to such party or such other address or fax number as may be designated in writing by such party and
(iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail address as
may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the
day of delivery, if delivered personally, on the business day following receipt of written confirmation, if sent by facsimile or electronic
transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail.

 

10. Construction. THIS NOTE SHALL BE CONSTRUED
AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF.

 

11. Severability. Any provision contained
in this Note which 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. Trust Waiver. Notwithstanding anything
herein to the contrary, the Payee hereby waives any and all right, title, interest or claim of any kind (“Claim”) in
or to any distribution of or from the trust account to be established in which the proceeds of the initial public offering (the “IPO”)
conducted by the Maker (including the deferred underwriting discounts and commissions) and the proceeds of the sale of the warrants issued
in a private placement to occur prior to the effectiveness of the IPO are to be deposited, as described in greater detail in the registration
statement and prospectus to be filed with the Securities and Exchange Commission in connection with the IPO, and hereby agrees not to
seek recourse, reimbursement, payment or satisfaction for any Claim against the trust account for any reason whatsoever.

 

13. Amendment; Waiver. Any amendment hereto
or waiver of any provision hereof may be made with, and only with, the written consent of the Maker and the Payee.

 

14. Assignment. No assignment or transfer
of this Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior
written consent of the other party hereto and any attempted assignment without the required consent shall be void.

 

[Signature page follows]

 

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IN WITNESS WHEREOF, Maker, intending to be
legally bound hereby, has caused this Note to be duly executed by the undersigned as of the day and year first above written.

 

	 	SILVER SUSTAINABLE SOLUTIONS CORP.
	 	a Delaware corporation 
	 	 
	 	By:	/s/ Jonathan M. Silver
	 	 	Name: 	Jonathan M. Silver
	 	 	Title: 	Chief Executive Officer

 

[Signature Page to Promissory Note]

 

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Schedule A

 

Payments Made to Maker

 

	Date	Amount DrawnExhibit 10.3

 

	 	Guggenheim Securities, LLC

330 Madison Avenue

New York, New York 10017

guggenheimpartners.com

 

September 20, 2021

 

Mr. Jonathan Silver

Chief Executive Officer

Silver Sustainable Solutions Corp.

1055 Thomas Jefferson St. NW, Suite #650

Washington, D.C. 20007

 

		Re:	Secondment of Crosby Fish

 

Dear Mr. Silver:

 

This will confirm the agreement between Guggenheim
Securities, LLC (“Guggenheim”) and Silver Sustainable Solutions Corp. (the “Host”)
to second Crosby Fish (the “Secondee”) to the Host on the terms set forth below.

 

Secondment

 

Secondee will be made available to support the
Host beginning as of the date set forth above (the “Effective Date”) and concluding on the date that is six
months after the Effective Date (or any extension thereof that may be agreed to by and between Guggenheim, the Host and the Secondee)
(the “Secondment Period”). For each full month that the Secondee provides services to the Host, the Host agrees
to pay Guggenheim a fee of up to $33,333 (the “Secondment Fee”) for the Secondee’s services, which shall be accrued
and paid on a quarterly basis. Any Secondment Fee shall be prorated for any partial months. The Secondment Period may be terminated by
either party on ten days written notice and may be extended if mutually agreed in writing by Guggenheim and the Host.

 

All services provided by Secondee will be provided
either remotely or in an office space of, or arranged by, the Host. Secondee will be seconded to the Host on a full-time basis, will work
under the supervision of the Host which will determine the matters to which Secondee is assigned will oversee his work. Both parties agree
to inform the other as soon as reasonably practicable of any significant matter that may arise during the Secondment Period relating to
the Secondee.

 

Conflicts of Interest

 

During the Secondment Period, the Secondee will
not work in any Guggenheim office or on any Guggenheim matters, nor will he have access to Guggenheim systems except for limited e-mail
access and third-party data platforms as needed for due diligence purposes. During and after the Secondment Period, Secondee will have
obligations to Guggenheim and the Host with respect to Confidential Information, as that term and such obligations are described in Appendix
A hereto, excerpts from the Secondment Agreement between Secondee and Guggenheim concerning Confidential Information. During the Secondment
Period, Secondee shall owe a duty of loyalty exclusively to the Host, notwithstanding that he will remain an employee of Guggenheim.

 

     

     

    

 

Employment of Secondee

 

The Host acknowledges and agrees that Secondee
is and shall remain during the Secondment Period an employee of Guggenheim, which shall continue to provide compensation, subject to applicable
withholdings, and all applicable benefits and coverages associated with Secondee’s employment with Guggenheim including, but not
limited to, health care coverage and workers compensation coverage. Secondee shall also continue to be eligible for leave and vacation
as per Guggenheim policies, but shall coordinate logistics with the Host.

 

During the Secondment Period, Guggenheim agrees
to indemnify and hold the Host harmless for any claims for unpaid wages, bonuses, fringe benefits or other compensation Secondee could
bring based on monies or benefits owed by Guggenheim. Guggenheim will not, however, be responsible for compensation (if any) promised
by the Host to which Guggenheim has not agreed. The Host acknowledges that it is not authorized to make representations or agreements
about compensation to Secondee, nor shall it make any payments to Secondee with respect to the Secondment Period without Guggenheim’s
approval. Notwithstanding the foregoing, the Host shall be responsible for reimbursing to the Secondee any reasonable travel, accommodation
and other expenses, if any, wholly, exclusively and necessarily incurred by Secondee during the Secondment Period provided such expenses
are incurred and documented in a manner specified by Host.

 

To the extent any claims are asserted against
Guggenheim or against Secondee in connection with his work on behalf of the Host during the Secondment Period, the Host agrees to defend,
indemnify and hold Guggenheim and Secondee harmless from and against any such claims and all associated costs and expenses to the extent
that the Host would defend or indemnify any employee of Host against such claims.

 

Miscellaneous

 

This agreement represents the entire agreement
between Guggenheim and the Host in connection with the Secondee and neither is relying on any statements or representations not set out
herein. This agreement shall be governed by the laws of the State of New York, without regard to conflict of law provisions.

 

We are pleased to be able to offer this arrangement.
If you accept the terms of this Agreement, please execute and return this letter to me.

 

Sincerely,

 

	/s/ Derek R. Ahmann	 
	Derek R. Ahmann	 
	Senior Managing Director	 

 

	 	ACCEPTED AND AGREED TO:
	 	 	 
	 	SILVER SUSTAINABLE SOLUTIONS CORP. 
	 	 	 
	 	By: 	/s/ Jonathan Silver
	 	Name: 	Jonathan Silver
	 	Title:	Chief Executive Officer

 

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Appendix A

 

Excerpts of the Secondment Agreement

 

		6.	Confidentiality as between the Firm and the Host

 

In addition to any confidentiality obligations you owe the
Firm in connection with the 2018 Agreement and Firm policy, and which you will owe the Host in connection with the Secondment, you also
specifically agree that, both during and after the Secondment Period, you will not share with, or disclose to, Guggenheim any Confidential
Information of the Host, nor will you share with, or disclose to, the Host any Confidential Information of Guggenheim. For purposes of
this Section, Confidential Information shall include the following with respect to Guggenheim or the Host, as the case may be: all non-public
confidential and proprietary information of Guggenheim and the Host (including such information concerning the business relationships
of Guggenheim and the Host that is generally not known to the public); information of a technical and non-technical nature relating to
the business of Guggenheim and the Host, including actual and anticipated business, research, products, business practices and business
plans (both current and under development), source code, finances, developments, formulae and transactions; non-public information, observations
and data relating to the business of Guggenheim, the Host or any of its current or prospective customers, clients or business relationships
who have provided Guggenheim or the Host, as the case may be, with information in confidence (each, a “Protected Party” and,
collectively, the “Protected Parties”).

 

As used herein, the term “Confidential
Information” also included any and all non-public information that is used, developed, learned, or obtained from or with respect
to Guggenheim’s, the Host’s or a Protected Party’s business, including, but not limited to, all past, current and planned
and under development (i) products or services, (ii) fees, costs and pricing structures, (iii) market studies, (iv) business plans and
investment analyses, (v) designs and specifications, (vi) data and analyses, (vii) drawings, photographs and reports, (viii) computer
software, including operating systems, applications and program listings, and simulation software, (ix) flow charts, manuals and documentation,
(x) data bases, (xi) accounting and business methods, (xii) inventions, devices, new developments, methods and processes, whether patentable
or unpatentable and whether or not reduced to practice, (xiii) investors in any fund managed by Guggenheim or the Host and information
regarding such investors, (xiv) copyrightable works, (xv) technology and trade secrets, (xvi) historical financial statements, financial
projections and budgets, revenues, projections, profits, investments (xvii) personnel training techniques and materials, (xviii) client
and customer lists and contact information if generally not publicly available, (xix) promotional programs and strategies, and marketing
programs and strategies (xx) research, (xxi) Guggenheim, Host and client projections, (xxii) profits and analysis and business models,
(xxiii) mathematical models, (xxiv) algorithms, and information pertaining to trading, processes, codes, system designs, system specifications,
techniques, computer programs, applications developed by or for the Firm or the Host, (xxv) supervisory and /or risk control techniques
and procedures, (xxvi) personal information and compensation structures, and (xxvii) similar and related information, based in whole or
in part on any information included in the foregoing, in whatever form. Confidential Information shall not include any information that
has been published in a form generally available to the public or is otherwise in the public domain prior to the date any such information
was disclosed by you (unless published by you in violation of the terms of this letter).

 

During the Secondment Period, all Confidential
Information relating to the business of the Host which you shall develop, conceive, produce, prepare, use, construct or observe during
your employment shall be the sole property of the Host and to the extent not public shall be Confidential Information as well. During
employment, Secondment and thereafter you are obliged to help preserve the confidentiality of Confidential Information.

 

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You hereby agree that, subject to the
exceptions of the following Section 7, you will not disclose or use at any time, before, during or after the Secondment Period any Confidential
Information of the Host which you are or you become aware, whether or not such information is developed by you, except to the extent that
such disclosure or use is directly related to and required by your performance of duties to the Host or otherwise required by service
of process (and then only with prior notice to the Host so that it may seek to protect confidentiality). You hereby agree that you will
take all reasonably appropriate steps to safeguard all Confidential Information and to protect it against disclosure, misuse, espionage,
loss and theft.

 

At the cessation of the Secondment Period,
you agree to promptly return to the Host all materials which during the Secondment Period is held by you in trust for the sole benefit
of the Host and which is the sole property of the Host, even when created and/or developed by you in “off hours” and/or away
from any premises of the Host, including all Confidential Information of the Host, whether developed by you or others, which is in your
possession, custody or control. Prior to the Secondment Period, you agree to return all Confidential Information of Guggenheim in your
possession, custody or control and agree not to use or access any such information during the Secondment Period.

 

		7.	Cooperation with Government Authorities and Regulatory Organizations

 

Nothing in this Secondment Agreement
(including in Appendix A, which is part of this Agreement), nor any policy of Guggenheim or the Host, is intended, or shall be deemed,
to prohibit or restrict you in any way from communicating directly with, reporting to, cooperating with, responding to any inquiry from
or providing testimony before, the FCA, the Securities and Exchange Commission, FINRA, or any other self-regulatory organization, or any
other federal, state or local regulatory authority, or government agency or commission regarding any possible securities violation or
other possible violation of law or this Agreement. Moreover, you are not required to provide advance notice to, or have prior authorization
from, the Firm or the Host in order to engage in any of the activity referenced in this Section. Without prior authorization of the Chief
Legal Officer of the Firm, however, the Firm does not authorize you to disclose to any third party (including any government or regulatory
official or any attorney) any communication that is covered by the Firm’s attorney-client or other privilege. Similarly, without
prior authorization of the Host, you are not authorized to disclose to any third party (including any government or regulatory official
or any attorney) any communication that is covered by the Host’s attorney-client or other privilege.

 

 

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