Exhibit 3.1

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

NB MERGER CORP.

Pursuant to Section 242 and 245 of the

Delaware General Corporation Law

NB Merger Corp., a corporation existing under the laws of the State of Delaware (the “Corporation”), by its Chief Executive Officer, hereby certifies as follows:

1. The name of the Corporation is “NB Merger Corp.”

2. The Corporation’s Certificate of Incorporation was filed in the office of the Secretary of State of the State of Delaware on November10, 2020.

3. This Amended Restated Certificate of Incorporation restates, integrates and amends the Certificate of Incorporation of the Corporation.

4. This Amended and Restated Certificate of Incorporation was duly adopted by joint written consent of the directors and stockholders of the Corporation in accordance with the applicable provisions of Sections 141(f), 228, 242 and 245 of the General Corporation Law of the State of Delaware (“GCL”).

5. The text of the Certificate of Incorporation of the Corporation is hereby amended and restated to read in full as follows:

First: The name of the corporation is Nuvve Holding Corp. (hereinafter sometimes referred to as the “Corporation”).

Second: The registered office of the Corporation is to be located at c/o Vcorp Services, LLC, 1013 Centre Road, Suite 403-B, New Castle County, Wilmington, Delaware 19805. The name of its registered agent at that address is Vcorp Services, LLC.

Third: The purpose of the Corporation shall be to engage in any lawful act or activity for which corporations may be organized under the GCL.

Fourth: The total number of shares of all classes of capital stock which the Corporation shall have authority to issue is 101,000,000 of which 100,000,000 shares shall be Common Stock of the par value of $0.0001 per share (“Common Stock”), and 1,000,000 shares shall be Preferred Stock of the par value of $0.0001 per share (“Preferred Stock”).

A. Preferred Stock. The Board of Directors is expressly granted authority to issue shares of the Preferred Stock, in one or more series, and to fix for each such series such voting powers, full or limited, and such designations, preferences and relative, participating, optional or other special rights and such qualifications, limitations or restrictions thereof as shall be stated and expressed in the resolution or resolutions adopted by the Board of Directors providing for the issue of such series (a “Preferred Stock Designation”) and as may be permitted by the GCL. The number of authorized shares of Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the voting power of all of the then outstanding shares of the capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class, without a separate vote of the holders of the Preferred Stock, or any series thereof, unless a vote of any such holders is required pursuant to any Preferred Stock Designation.

B. Common Stock.

1. General. The voting, dividend, liquidation, conversion and stock split rights of the holders of the Common Stock are subject to and qualified by the rights of the holders of the Preferred Stock of any series as may be designated by the Board of Directors upon any issuance of the Preferred Stock of any series. The number of authorized shares of Common Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the stock of the Corporation entitled to vote, irrespective of the provisions of Section 242(b)(2) of the GCL.

2. Voting. Each holder of Common Stock shall be entitled to one vote for each share of Common Stock held by such holder. Each holder of Common Stock shall be entitled to notice of any stockholders’ meeting in accordance with the Bylaws of the Corporation (as in effect at the time in question) (the “Bylaws”) and applicable law on all matters put to a vote of the stockholders of the Corporation.

3. Dividends. Subject to the rights of any holders of any shares of Preferred Stock which may from time to time come into existence and be outstanding, the holders of Common Stock shall be entitled to the payment of dividends when and as declared by the Board of Directors in accordance with applicable law and to receive other distributions from the Corporation. Any dividends declared by the Board of Directors to the holders of the then outstanding shares of Common Stock shall be paid to the holders thereof pro rata in accordance with the number of shares of Common Stock held by each such holder as of the record date of such dividend.

4. Liquidation. Subject to the rights of any holders of any shares of Preferred Stock which may from time to time come into existence and be outstanding, in the event of any liquidation, dissolution or winding up of the Corporation, whether voluntary or involuntary, the funds and assets of the Corporation that may be legally distributed to the Corporation’s stockholders shall be distributed among the holders of the then outstanding shares of Common Stock pro rata in accordance with the number of shares of Common Stock held by each such holder.

Fifth:

A. Subject to the rights of the holders of shares of any series of Preferred Stock then outstanding to elect additional directors under specified circumstances, the number of directors shall be fixed from time to time exclusively by the Board of Directors pursuant to a resolution adopted by a majority of the Whole Board. For purposes of this Certificate of Incorporation, “Whole Board” shall mean the total number of authorized directors whether or not there exist any vacancies in previously authorized directorships.

B. Subject to the rights of the holders of shares of any series of Preferred Stock then outstanding to elect additional directors under specified circumstances, the Board of Directors shall be divided into three classes: Class A, Class B and Class C. The number of directors in each class shall be as nearly equal as possible. The directors in Class A shall be elected for a term expiring at the 2022 Annual Meeting of Stockholders, the directors in Class B shall be elected for a term expiring at the 2023 Annual Meeting of Stockholders and the directors in Class C shall be elected for a term expiring at the 2024 Annual Meeting of Stockholders. The Board of Directors is authorized to assign members of the Board of Directors already in office to such classes upon the classification of the Board of Directors. Commencing at the 2022 Annual Meeting of Stockholders, and at each annual meeting thereafter, directors elected to succeed those directors whose terms expire shall be elected for a term of office to expire at the third succeeding annual meeting of stockholders after their election.

C. Except as the GCL may otherwise require, newly created directorships and any vacancies in the Board of Directors (including unfilled vacancies resulting from the removal of directors for cause) may be filled by the vote of a majority of the remaining directors then in office, although less than a quorum (as defined in the Bylaws), or by the sole remaining director. All directors shall hold office until the expiration of their respective terms of office and until their successors shall have been elected and qualified. A director elected to fill a vacancy resulting from the death, resignation or removal of a director shall serve for the remainder of the full term of the class of the director whose death, resignation or removal shall have created such vacancy and until his successor shall have been elected and qualified. No decrease in the authorized number of directors shall shorten the term of any incumbent director.

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D. During any period when the holders of any series of Preferred Stock have the right to elect additional directors as provided for or fixed pursuant to the provisions of Article Fourth hereof (including any certificate of designation adopted pursuant thereto) (any such director, a “Preferred Stock Director”), and upon commencement and for the duration of the period during which such right continues: (i) the then otherwise total authorized number of directors of the Corporation shall automatically be increased by such number of Preferred Stock Directors that the holders of any series of Preferred Stock have a right to elect, and the holders of such Preferred Stock shall be entitled to elect the additional Preferred Stock Directors so provided for or fixed pursuant to said provisions; and (ii) each such Preferred Stock Director shall serve until his or her successor shall have been duly elected and qualified, or until his or her right to hold such office terminates pursuant to said provisions, whichever occurs earlier, subject to his or her earlier death, disqualification, resignation or removal. In case any vacancy shall occur among the Preferred Stock Directors, a successor Preferred Stock Director may be elected by the holders of Preferred Stock pursuant to said provisions. Except as otherwise provided for or fixed pursuant to the provisions of Article Fourth hereof (including any certificate of designation), whenever the holders of any series of Preferred Stock having such right to elect an additional Preferred Stock Director are divested of such right pursuant to said provisions, the terms of office of such Preferred Stock Director elected by the holders of such Preferred Stock, or elected to fill any vacancies resulting from the death, resignation, disqualification or removal of such additional Preferred Stock Director, shall forthwith terminate (in which case such person shall cease to be qualified as a director and shall cease to be a director) and the total authorized number of directors of the Corporation shall be automatically reduced accordingly.

E. Subject to any rights of the holders of one or more series of Preferred Stock to elect directors, any director or the entire Board may be removed from office at any time, but only for cause and only by the affirmative vote of the holders of at least sixty-six and two-thirds percent (66 2/3%) of the voting power of all of the then outstanding shares of the capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class. For purposes of this Paragraph E, “cause” shall mean, with respect to any director, (i) the willful failure by such director to perform, or the gross negligence of such director in performing, the duties of a director, (ii) the engaging by such director in willful or serious misconduct that is injurious to the Corporation, or (iii) the conviction of such director of, or the entering by such director of a plea of nolo contendere to, a crime that constitutes a felony.

Sixth: The following provisions are inserted for the management of the business and for the conduct of the affairs of the Corporation, and for further definition, limitation and regulation of the powers of the Corporation and of its directors and stockholders:

A. Election of directors need not be by ballot unless the Bylaws of the Corporation so provide.

B. In furtherance and not in limitation of the rights, power, privileges and discretionary authority granted or conferred by the GCL or other statutes or laws of the State of Delaware, the Board of Directors shall have the power, without the assent or vote of the stockholders, to make, alter, amend, change, add to or repeal the Bylaws as provided in the Bylaws. The Corporation may in its Bylaws confer powers upon its Board of Directors in addition to the foregoing and in addition to the powers and authorities expressly conferred upon the Board of Directors by applicable law. The stockholders shall also have power to adopt, amend or repeal the Bylaws of the Corporation; provided, that in addition to any vote of the holders of any class or series of stock of the Corporation required by law or by this Certificate of Incorporation, the affirmative vote of the holders of at least sixty-six and two-thirds percent (66 2/3%) of the voting power of all of the then outstanding shares of the capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class, shall be required for the stockholders to adopt, amend or repeal any provision of the Bylaws of the Corporation; provided, however, that if the Board of Directors unanimously approves or unanimously recommends that stockholders approve such adoption, amendment or repeal, such adoption, amendment or repeal shall only require, in addition to any vote of the holders of any class or series of the capital stock of the Corporation required by law or by this Certificate of Incorporation, the affirmative vote of the holders of the majority of the voting power of all of the then outstanding shares of capital stock of the Corporation present and entitled to vote thereon, voting together as a single class.

C. The directors in their discretion may submit any contract or act for approval or ratification at any annual meeting of the stockholders or at any meeting of the stockholders called for the purpose of considering any such act or contract, and any contract or act that shall be approved or be ratified by the vote of the holders of a majority of the stock of the Corporation which is represented in person or by proxy at such meeting and entitled to vote thereat (provided that a lawful quorum of stockholders be there represented in person or by proxy) shall be as valid and binding upon the Corporation and upon all the stockholders as though it had been approved or ratified by every stockholder of the Corporation, whether or not the contract or act would otherwise be open to legal attack because of directors’ interests, or for any other reason.

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D. In addition to the powers and authorities hereinbefore or by statute expressly conferred upon them, the directors are hereby empowered to exercise all such powers and do all such acts and things as may be exercised or done by the Corporation; subject, nevertheless, to the provisions of the statutes of the State of Delaware, of this Certificate of Incorporation, and to the Bylaws; provided, however, that no bylaw shall invalidate any prior act of the directors which was valid prior to such bylaw having been made.

E. Subject to the rights of any series of Preferred Stock then outstanding, no action that is required or permitted to be taken by the stockholders of the Corporation at any annual or special meeting of stockholders may be effected by written consent of stockholders in lieu of a meeting of stockholders, unless the Board of Directors unanimously approves or unanimously recommends that stockholders approve such action.

F. Special meetings of the stockholders of the Corporation may be called only by the Board of Directors acting pursuant to a resolution adopted by a majority of the Whole Board, by the Chairman of the Board of Directors or by the Chief Executive Officer of the Corporation. Business transacted at any special meeting of stockholders shall be limited to matters relating to the purpose or purposes stated in the notice of meeting.

Seventh:

A. The personal liability of the directors of the Corporation to the Corporation or its stockholders for monetary damages for breach of his or her fiduciary duty as director is hereby eliminated to the fullest extent permitted by the GCL. Any amendment, repeal or modification of this Article Seventh, or the adoption of any provision of this Certificate of Incorporation inconsistent with this Article Seventh, shall not adversely affect any right or protection of a director of the Corporation with respect to acts or omissions occurring prior to such amendment, repeal or modification. If the GCL is amended after approval by the stockholders of this Article Seventh to authorize corporate action further eliminating or limiting the personal liability of directors, then the liability of a director of the Corporation shall be eliminated or limited to the fullest extent permitted by the GCL as so amended.

B. The Corporation, to the full extent permitted by Section 145 of the GCL, (i) shall indemnify, advance expenses to and hold harmless (a) its current and former directors and officers and (b) any person who, while a director or officer, is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, from and against any and all of the expenses, liabilities, or other matters referred to in or covered by said section as amended or supplemented (or any successor); provided, however, that except with respect to proceedings to enforce rights to indemnification or an advancement of expenses, the Corporation shall not be required to indemnify or advance expenses to any such director or officer in connection with a proceeding (or part thereof) initiated by such director or officer unless such proceeding (or part thereof) was authorized by the Board of Directors and (ii) may provide indemnification or advance expenses to employees and agents of the Corporation or other persons as set forth in the Bylaws of the Corporation and on such terms and conditions and to the extent determined by the Board of Directors in its sole and absolute discretion. Any amendment, repeal or modification of this Article Seventh shall not adversely affect any rights or protection existing hereunder with respect to acts or omissions occurring prior to such repeal or modification.

C. If any word, clause, provision or provisions of this Article Seventh shall be held to be invalid, illegal or unenforceable for any reason whatsoever: (i) the validity, legality and enforceability of the remaining provisions of this Article Seventh (including, without limitation, each portion of any paragraph of this Article Seventh containing any such provision held to be invalid, illegal or unenforceable, that is not itself held to be invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby; and (ii) to the fullest extent possible, the provisions of this Article Seventh (including, without limitation, each such portion of any paragraph of this Article Seventh containing any such provision held to be invalid, illegal or unenforceable) shall be construed so as to give effect to the intent manifested by the provision held invalid, illegal or unenforceable.

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Eighth:

A. Unless the Corporation consents in writing to the selection of an alternative forum, the Court of Chancery (the “Chancery Court”) of the State of Delaware (or, in the event that the Chancery Court does not have jurisdiction, the federal district court for the District of Delaware or other state courts of the State of Delaware) shall, to the fullest extent permitted by law, be the sole and exclusive forum for (i) any derivative action or proceeding brought on behalf of the Corporation, (ii) any action asserting a claim of breach of a fiduciary duty owed by any current or former director, officer, employee or agent of the Corporation to the Corporation or the Corporation’s stockholders, (iii) any action asserting a claim against the Corporation arising pursuant to any provision of the GCL or this Certificate of Incorporation or the Bylaws (as either may be amended from time to time), (iv) any action or proceeding to interpret, apply, enforce or determine the validity of this Certificate of Incorporation or the Bylaws (including any right, obligation, or remedy thereunder) or (v) any action asserting a claim against the Corporation governed by the internal affairs doctrine. Notwithstanding the foregoing, the provisions of this Paragraph A will not apply to suits brought to enforce any liability or duty created by the Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as amended, or any other claim for which the federal courts have exclusive jurisdiction. Unless the Corporation consents in writing to the selection of an alternative forum, the federal district courts of the United States of America shall, to the fullest extent permitted by applicable law, be the sole and exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act of 1933, as amended.

B. If any provision or provisions of this Article Eighth shall be held to be invalid, illegal or unenforceable as applied to any person or entity or circumstance for any reason whatsoever, then, to the fullest extent permitted by law, the validity, legality and enforceability of such provisions in any other circumstance and of the remaining provisions of this Article Eighth (including, without limitation, each portion of any sentence of this Article Eighth containing any such provision held to be invalid, illegal or unenforceable that is not itself held to be invalid, illegal or unenforceable) and the application of such provision to other persons or entities and circumstances shall not in any way be affected or impaired thereby. Any person or entity purchasing or otherwise acquiring any interest in shares of capital stock of the Corporation shall be deemed to have notice of and consented to the provisions of this Article Eighth.

Ninth: From time to time any of the provisions of this Certificate of Incorporation may be amended, altered, changed or repealed, and other provisions authorized by the laws of the State of Delaware at the time in force may be added or inserted in the manner and at the time prescribed by said laws, and all rights at any time conferred upon the stockholders of the Corporation by this Certificate of Incorporation are granted subject to the provisions of this Article Ninth; provided that in addition to the vote of the holders of any class or series of stock of the Corporation required by law or by this Certificate of Incorporation, the affirmative vote of the holders of shares of voting stock of the Corporation representing at least sixty-six and two-thirds percent (66 2/3%) of the voting power of all of the then outstanding shares of the capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class, shall be required to amend, alter or repeal, or adopt any provision inconsistent with, Articles Fifth, Sixth, Seventh, Eighth or Ninth of this Certificate of Incorporation.

[Signature Page Follows]

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IN WITNESS WHEREOF, the Corporation has caused this Amended and Restated Certificate of Incorporation to be signed by its Chief Executive Officer, as of the 19th day of March, 2021.

/s/ Wenhui Xiong

Wenhui Xiong, Chief Executive Officer

[Signature Page to Amended and Restated Certificate of Incorporation]

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