• Isometric has been approved by ICAO to issue carbon credits for use under Corsia, allowing airlines to meet obligations with credits verified to high scientific and transparency standards.
• The decision strengthens aviation’s access to credible carbon removals as demand rises towards an estimated 500 million tonnes a year by 2050, with industry leaders such as British Airways highlighting the importance of reliable supply.
• The approval builds on recent recognition from the Integrity Council for the voluntary carbon market, positioning Isometric as a leading registry for high-integrity carbon removal pathways.

Isometric, the world’s leading carbon removal registry, has received approval from the International Civil Aviation Organization (ICAO) to issue carbon credits under the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA). Airlines can now use Isometric-verified carbon removal credits to meet their CORSIA obligations.

CORSIA is a UN-backed global framework that requires airlines to offset emissions from international flights above 2019 levels using approved carbon credits. The International Air Transport Association estimates airlines globally will require around 500 million tonnes of carbon removals annually by 2050 to achieve net zero emissions.

The approval makes Isometric one of a select group of registries recognized under the scheme, following a comprehensive evaluation conducted by ICAO, which found that the registry met its standards for transparency, scientific rigor, and integrity.

“ICAO’s approval of Isometric opens new pathways to additional supply for the scheme,” said Lukas May, Chief Commercial Officer at Isometric. “It also gives airlines access to the most scientifically rigorous and transparent carbon credits available on the market.”

Carrie Harris, British Airways’ Director of Sustainability, said “Expanding the global carbon removals market is essential for aviation to achieve net zero emissions. ICAO’s recognition of Isometric for CORSIA compliance is a significant step, providing a credible pathway towards setting a long-term net zero goal. This move also creates a strong demand signal for carbon removal project developers and supports airlines in meeting their CORSIA obligations with credible carbon removals.”

British Airways is the UK’s largest purchaser of carbon removals and the largest airline purchaser globally following its voluntary purchase in 2024 of a range of innovative carbon removals credits. By 2050, approximately one-third of the airline’s total emissions reductions are expected to come from carbon removals.

This follows on from the Integrity Council for the Voluntary Carbon Market’s decision to approve six Isometric protocols to issue credits with the Core Carbon Principles (CCP) label—with Isometric the first and only registry to receive ICVCM approval for five of these pathways.