File: Attachment GRB - June 29, 2026 - Greenbriar Closing of Convertible Debt and Warrant Amendments.pdf

Greenbriar Sustainable Living Inc. Greenbriar Capital Holdco Inc. Greenbriar Capital (US) LLC

632 Foster Avenue, Coquitlam, British Columbia, Canada V3J 2L7 Phone: 949.903.5906 Fax: 604.608.9572 www.greenbriarliving.com

NEWS RELEASE

Greenbriar Announces Closing of Amendments to CAD $1.0 Million Convertible Debenture and Warrants

Scottsdale, Arizona, June 29, 2026 - Greenbriar Sustainable Living Inc. (TSXV: GRB) (OTC: GEBRF) ("Greenbriar" or the "Company") is pleased to announce that, further to its news release dated June 24, 2026, it has received acceptance from the TSX Venture Exchange (the "Exchange") for amendments to the terms of its outstanding CAD $1.0 million unsecured convertible debenture originally issued on June 30, 2023 (the "Debenture").

The total proceeds of the Debenture are CAD $1,000,000, being the aggregate principal amount outstanding under the Debenture. The total proceeds do not include any accrued interest. Any accrued and unpaid interest owing under the Debenture may be settled in cash or, at the Company's election, through a shares-for-debt transaction. Any interest settled through a shares-for-debt transaction will be based on the market price of the Company's common shares at the time of settlement, in accordance with the policies of the Exchange.

The Company has amended the Debenture to extend the maturity date and conversion period by two years, from June 30, 2026 to June 30, 2028, and to reduce the conversion price of the Debenture from CAD $1.25 per common share to CAD $1.00 per common share, subject to adjustment in accordance with the terms of the Debenture.

The aggregate principal amount of CAD $1,000,000 outstanding under the Debenture is convertible into a maximum of 1,000,000 common shares at the amended conversion price of CAD $1.00 per common share, subject to adjustment in accordance with the terms of the Debenture.

The Debenture was originally issued pursuant to the Company's private placement announced on June 22, 2023, and closed on July 6, 2023. The Debenture bears interest at 12% per annum and was issued together with 460,000 detachable common share purchase warrants (collectively, the "Warrants"). The Debenture Holder is an arm's length party to the Company, and no insider of the Company holds the Debenture or the Warrants.

The Company has also amended the expiry date of the Warrants by extending the expiry date by two years, from June 30, 2026 to June 30, 2028. The exercise price of the Warrants remains unchanged at CAD $1.30 per common share, subject to adjustment in accordance with the terms of the Warrants.

All other terms of the Debenture and Warrants remain unchanged. The amendments to the Debenture and Warrants have been accepted by the Exchange and are effective on or about June 30, 2026.

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

"Jeff Ciachurski"

Jeffrey J. Ciachurski, CEO and Director, 949-903-5906

"Greenbriar Capital Corp. was recognized as a TSX Venture 50trademark company in 2014 and 2023. TSX Venture 50 is a trade-mark of TSX Inc. and is used under license."

TSX Venture Exchange Symbol: GRB US OTC Symbol: GEBRF - 2 -

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 applicable 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 amendments to the Debenture and Warrants, the settlement of accrued and unpaid interest in securities of the Company, the extension of the maturity date and conversion period of the Debenture, the amendment to the conversion price of the Debenture, the extension of the expiry date of the Warrants, the number of common shares issuable upon conversion of the Debenture and the acceptance of the TSX Venture Exchange. 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. 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. The Company does not undertake to update or revise any forward-looking statements, except in accordance with applicable law.

"Greenbriar Capital Corp. was recognized as a TSX Venture 50trademark company in 2014 and 2023. TSX Venture 50 is a trade-mark of TSX Inc. and is used under license." TSX Venture Exchange Symbol: GRB US OTC Symbol: GEBRF

File: '\\swfile\EmailIn\20260629 145310 Attachment GRB - June 29, 2026 - Greenbriar Closing of Convertible Debt and Warrant Amendments.docx'

- 2 -

"Greenbriar Capital Corp. was recognized as a TSX Venture 50(TM) company in 2014 and 2023.

TSX Venture 50 is a trade-mark of TSX Inc. and is used under license."

TSX Venture Exchange Symbol: GRB | US OTC Symbol: GEBRF

Greenbriar Sustainable Living Inc.

Greenbriar Capital Holdco Inc.

Greenbriar Capital (US) LLC

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

Phone: 949.903.5906 Fax: 604.608.9572

www.greenbriarliving.com

"Greenbriar Capital Corp. was recognized as a TSX Venture 50(TM) company in 2014 and 2023.

TSX Venture 50 is a trade-mark of TSX Inc. and is used under license."

TSX Venture Exchange Symbol: GRB | US OTC Symbol: GEBRF

NEWS RELEASE

Greenbriar Announces Closing of Amendments to CAD $1.0 Million Convertible Debenture and Warrants

Scottsdale, Arizona, June 29, 2026 - Greenbriar Sustainable Living Inc. (TSXV: GRB) (OTC: GEBRF) ("Greenbriar" or the "Company") is pleased to announce that, further to its news release dated June 24, 2026, it has received acceptance from the TSX Venture Exchange (the "Exchange") for amendments to the terms of its outstanding CAD $1.0 million unsecured convertible debenture originally issued on June 30, 2023 (the "Debenture").

The total proceeds of the Debenture are CAD $1,000,000, being the aggregate principal amount outstanding under the Debenture. The total proceeds do not include any accrued interest. Any accrued and unpaid interest owing under the Debenture may be settled in cash or, at the Company's election, through a shares-for-debt transaction. Any interest settled through a shares-for-debt transaction will be based on the market price of the Company's common shares at the time of settlement, in accordance with the policies of the Exchange.

The Company has amended the Debenture to extend the maturity date and conversion period by two years, from June 30, 2026 to June 30, 2028, and to reduce the conversion price of the Debenture from CAD $1.25 per common share to CAD $1.00 per common share, subject to adjustment in accordance with the terms of the Debenture.

The aggregate principal amount of CAD $1,000,000 outstanding under the Debenture is convertible into a maximum of 1,000,000 common shares at the amended conversion price of CAD $1.00 per common share, subject to adjustment in accordance with the terms of the Debenture.

The Debenture was originally issued pursuant to the Company's private placement announced on June 22, 2023, and closed on July 6, 2023. The Debenture bears interest at 12% per annum and was issued together with 460,000 detachable common share purchase warrants (collectively, the "Warrants"). The Debenture Holder is an arm's length party to the Company, and no insider of the Company holds the Debenture or the Warrants.

The Company has also amended the expiry date of the Warrants by extending the expiry date by two years, from June 30, 2026 to June 30, 2028. The exercise price of the Warrants remains unchanged at CAD $1.30 per common share, subject to adjustment in accordance with the terms of the Warrants.

All other terms of the Debenture and Warrants remain unchanged. The amendments to the Debenture and Warrants have been accepted by the Exchange and are effective on or about June 30, 2026.

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

"Jeff Ciachurski"

Jeffrey J. Ciachurski, CEO and Director, 949-903-5906

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 applicable 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 amendments to the Debenture and Warrants, the settlement of accrued and unpaid interest in securities of the Company, the extension of the maturity date and conversion period of the Debenture, the amendment to the conversion price of the Debenture, the extension of the expiry date of the Warrants, the number of common shares issuable upon conversion of the Debenture and the acceptance of the TSX Venture Exchange.

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. 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. The Company does not undertake to update or revise any forward-looking statements, except in accordance with applicable law.