6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of March 2025

Commission File No. 000-56391

Greenbriar Sustainable Living Inc. (Translation of registrant's name into English)

632 Foster Avenue Coquitlam, British Columbia, Canada V3J 2L7

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F

Form 20-F ☑ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1) ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7) ☐

SUBMITTED HEREWITH

Exhibits

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Greenbriar Sustainable Living Inc.

/s/ Jeff Ciachurski ______________________________________ Jeff Ciachurski Chief Executive Officer

Date: March 14, 2025

Greenbriar Sustainable Living Inc.: Exhibit 99.1 - Filed by newsfilecorp.com

NEWS RELEASE

Greenbriar Announces Warrant Extension

Trading Symbol: TSX Venture Exchange: GRBUS OTC Market: GEBRF

Scottsdale, Arizona, March 14th, 2025 - Greenbriar Sustainable Living Inc. (TSXV: GRB) (OTC: GEBRF) ("Greenbriar" or the "Company") announces that it intends to extend the expiry date on the below share purchase warrants issued by the Company:

• The remaining 1,809,000 warrants that were originally issued as part of a private placement transaction on March 28, 2022 (see March 28, 2022 news release) exercisable at $1.35 per warrant and expiring March 28, 2025 will now be extended to an expiry date of March 28, 2027. All other terms and conditions of the warrants remain unchanged. The warrant extension is subject to acceptance by the TSX Venture Exchange.

About Greenbriar Sustainable Living Inc.

Greenbriar is a leading developer of sustainable real estate and renewable energy. With long-term, high impact projects and led by a successful industry-recognized operating and development team, Greenbriar targets deep valued assets directed at accretive shareholder value.

ON BEHALF OF THE BOARD OF DIRECTORS

/s/ Jeffrey J. Ciachurski Jeffrey J. Ciachurski

Chief Executive Officer and Director

Phone: 949.903.5906

The TSX Venture Exchange has not reviewed and does not accept responsibility for the accuracy or adequacy of this release. Neither the TSX Venture Exchange nor its Regulation Service Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

This news release includes "forward-looking statements" and "forward-looking information" within the meaning of Canadian securities laws and United States securities laws (together, "forward-looking statements"). All statements included in this news release, other than statements of historical fact, are forward-looking statements including, without limitation, statements with respect to the closing of the Shares for Debt Transaction, the issuance of Common Shares, and the approval of the Shares for Debt Transaction and the issuance of Options by the TSX Venture Exchange. Forward-looking statements include predictions, projections and forecasts and are often, but not always, identified by the use of words such as "anticipate", "believe", "plan", "estimate", "expect", "potential", "target", "budget", "propose" and "intend" and statements that an event or result "may", "will", "should", "could" or "might" occur or be achieved and other similar expressions and includes the negatives thereof.

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Forward-looking statements are based on a number of assumptions and estimates that, while considered reasonable by management based on the business and markets in which the Company operates, are inherently subject to significant operational, economic, and competitive uncertainties, risks and contingencies. These include assumptions regarding, among other things: general business and economic conditions. There can be no assurance that forward- looking statements will prove to be accurate and actual results, and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Company's expectations include those described under the heading "Risks and Uncertainties" in the Company's most recently filed MD&A (a copy of which is available under the Company's SEDAR profile at www.sedarplus.ca*). The Company does not undertake to update or revise any forward-looking statements, except in accordance with applicable law.*