Frontier Approves Puro.earth's Enhanced Rock Weathering Methodology

Follows Frontier's approval of Puro.earth's Geologically Stored Carbon methodology in 2024 and Frontier’s designation of Puro.earth as a Leading Credit Issuer in 2025.

Helsinki, 22 June 2026 -- Puro.earth, the world’s leading market infrastructure provider for engineered carbon dioxide removal (CDR), today announced that Frontier, an advance market commitment to buy $1.8B of permanent carbon removal between 2022 and 2040, has approved Puro.earth's Enhanced Rock Weathering (ERW) 2025 methodology for use by Frontier suppliers. It is the second Puro.earth methodology to earn Frontier's approval, following Frontier's 2024 approval of Puro.earth's Geologically Stored Carbon methodology.

This approval means that Frontier suppliers can use this methodology to certify ERW credits as part of Frontier commitments. It recognises the close collaboration between Puro.earth and the scientific community on Puro.earth’s updated 2025 ERW methodology to ensure rigorous, accountable delivery.

>> In Other News: Ballard Announces Acquisition of UK-Based GeoPura, Powering Future Growth and Transforming Ballard Into an Integrated Hydrogen Ecosystem Provider

The ERW 2025 methodology brought a significant update to Puro.earth's approach to certifying ERW projects, and was developed in collaboration with experts from academia, industry, and the non-profit sector. Key updates included more detailed quantification approaches - requiring suppliers to combine two independent measurement methods for greater reliability - alongside clearer sampling requirements, refined accounting for carbon losses, and a new framework for managing measurement uncertainty.

Puro.earth’s ERW methodology approval follows Frontier's approval of Puro.earth's Geologically Stored Carbon methodology in 2024, subject to two conditions: for direct air capture (DAC) projects, suppliers must also comply with Frontier's clean energy procurement principles; for BECCS projects, approval currently applies only to projects with minimal net new biomass use.

Puro.earth was designated as a Leading Credit Issuer by Frontier in April 2025, reinforcing Puro.earth's position as the market infrastructure of choice for suppliers pursuing high-quality engineered carbon removal. Puro.earth received ICVCM Carbon Crediting Programme eligibility in 2025.

"Our ERW 2025 methodology underwent rigorous review by the scientific community, and Frontier's approval is a strong signal that the bar we've set meets the most demanding procurement standards in the market for this pathway," said Jan-Willem Bode, President of Puro.earth. "Together with the approval of our Geologically Stored Carbon methodology, this reflects the breadth and quality of the infrastructure Puro.earth provides across the engineered CDR sector."

ENDS

About Puro.earth

Puro.earth is the world’s leading market infrastructure provider for engineered carbon dioxide removal (CDR). We provide the certification frameworks, scientific standards, and digital systems that allow engineered CDR to scale as an investment-grade market.

At the core of this infrastructure is the Puro Standard – the world’s first dedicated standard built for the needs of an engineered CDR market. We certify suppliers under the Puro Standard that durably store carbon dioxide for at least 100 years, and in many cases over 1,000 years. To date, we have certified over 100 engineered CDR projects, resulting in the issuance of over 1.5 million CO₂ Removal Certificates (CORCs) in the Puro Registry as verified, traceable, investable assets. Our infrastructure is trusted by over 700 companies worldwide to procure carbon removals with confidence.

Nasdaq has owned a majority stake in Puro.earth since 2021. This brings 50+ years of expertise in building and operating the world’s most trusted markets, strengthening Puro.earth’s ability to deliver the transparency, rigour, and operational capacity needed to make CDR an institutional-grade asset class

Puro.earth is an ICVCM Eligible Carbon Crediting Programme.

For more information, visit www.puro.earth.