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

We are starting a new series on super pollutants. Some of you may be wondering: Where was Season 1? Did I miss it? Calyx Global has been writing about superpollutants since 2022. Why?When Calyx Global first started rating carbon credits in 2021, our goal was coverage: rate as much of the market as possible. This led us to start by rating many large-scale grid-connected renewable energy (ACM0002) and REDD projects – together, these made up over 68% of voluntary carbon market (VCM) retirements in 2021. However, we quickly discovered that this was not very helpful to our customers, because the majority of ACM0002 credits have a high risk of non-additionality. Additionally, REDD credits had significantly overestimated baselines – 

July 16, 2026

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Carbon ratings in a maturing carbon market: A conversation

August 16, 2026

"Building a bridge to the buyer": How Groundwork BioAg uses Calyx Compass to align project design with market demand

August 10, 2026

The unsung hero of climate action: Why it’s time to focus on superpollutants

August 5, 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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Superpollutants Season 2: Revisiting a critical part of the carbon markets

July 16, 2026

HFC destruction: A new horizon for super pollutant credits?

May 12, 2026

Leaderboard: Which companies retire the highest quality carbon credits?

May 11, 2026

Customer stories

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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

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

July 13, 2026

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

August 6, 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