Why the carbon market's "ugly ducklings" are becoming its biggest success stories.

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Leaderboard: Which companies retire the highest quality carbon credits?

Companies around the world purchase and retire carbon credits as one piece of their climate action strategy (in conjunction with other measures, like reducing their operational emissions). But not all carbon credits are created equal. Calyx Global has conducted more than 1,000 ratings of carbon credit projects to assess how likely they are to meet their greenhouse gas emission reduction (or removal) claims—the largest such data set available. (We also rate projects for contributions to Sustainable Development Goals and environmental and social risks, though those are not included on this page—you can read about 

May 11, 2026

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"Integrity and impartiality are the priority": How McGill St. Laurent backs up its carbon trading desk with third-party trust

July 22, 2026

Superpollutants Season 2: Revisiting a critical part of the carbon markets

July 16, 2026

“What's behind the rating”: Why Shell trusts Calyx Global for detailed analysis

July 13, 2026

Commentary

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Donna Lee in Trellis: Cheap isn’t always a bad thing when it comes to carbon credits

April 30, 2026

VM0048 after two years: First credits on the horizon

April 14, 2026

How Carbon Credits Work - Donna Lee on the Electric Ladies Podcast

April 2, 2026

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How risky is the carbon credit market?

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Research

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HFC destruction: A new horizon for super pollutant credits?

May 12, 2026

Leaderboard: Which companies retire the highest quality carbon credits?

May 11, 2026

What is cumulative accounting? How a carbon credit rating can improve over time

April 23, 2026

Customer stories

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Helping Harvard Business School offset travel emissions with high-quality credits

August 6, 2024

Mitigating environmental and social risks in Volkswagen ClimatePartner’s investments

December 2, 2024

Duke University protects its reputation with high-quality climate action

July 8, 2024

Ratings approach

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Calyx Global Ratings Explained

April 5, 2023

The Calyx Global Approach to GHG Ratings

June 16, 2023

The Calyx Global Approach to SDG Ratings

August 24, 2023

News & events

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Calyx Global launches Pricing Intelligence to make carbon credit purchasing smarter

March 19, 2026

Calyx Global, BlueLayer partner to expand access to carbon credit supply

February 25, 2026

Introducing SupplyBridge: Search available inventory from hundreds of sellers, all in one place

February 17, 2026

ICVCM CCP-label tracker

An up-to-date list of ICVCM CCP label decisions, alongside our expert analysis

May 13, 2026