POWER OF ATTORNEY

     KNOW ALL BY THESE PRESENTS, that the undersigned hereby authorizes David
Kennedy of GreenLight Biosciences Holdings, PBC (the "Company") and John D.
Hancock, Morris Zarif, and Erica Harrington of Foley Hoag LLP, each acting
singly, to execute and cause to be filed with the United States Securities and
Exchange Commission any and all documents or filings, including any amendments
thereto, required to be so filed. The undersigned hereby grants to the
attorney-in-fact full power and authority to do and perform any and every act
and thing whatsoever requisite, necessary or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do personally present, with full
power of substitution, resubstitution or revocation, hereby ratifying and
confirming all that such attorney-in-fact, or such attorney-in-fact's
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted. The
undersigned acknowledges that the foregoing attorney-in-fact, or such attorney-
in-fact's substitute, in serving in such capacity at the request of the
undersigned, is not assuming, nor is the Company assuming, any liability from
the undersigned's responsibilities to comply with all applicable laws,
including Sections 13 and 16 of the Securities Exchange Act of 1934 (the
"Exchange Act").

     This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned is no longer required to file Forms 3,
4 and 5 in accordance with Section 16(a) of the Exchange Act with respect to
the undersigned's holdings of and transactions in securities issued by the
Company, (b) revocation by the undersigned in a signed writing delivered to the
Company and the foregoing attorney-in-fact and (c) as to any attorney-in-fact
individually, until such attorney-in-fact is no longer employed by the Company
or employed by or a partner at Foley Hoag LLP, or another law firm representing
the Company, as applicable.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 26 day of January, 2022.

/s/ Andrey Juan Zarur
Name: Andrey Juan Zarur