The Calyx Global Approach to GHG Ratings

The Voluntary Carbon Market is facing increasing demands for transparency and credibility. As buyers seek to ensure the integrity of the carbon credits they support, robust, independent assessments of greenhouse gas claims are critical.

This explainer describes Calyx Global’s greenhouse gas (GHG) Ratings system—how we assess whether credits genuinely reflect climate impact.

What you'll learn:

• How Calyx Global evaluates carbon credit quality across six key integrity risks, including additionality, over-crediting and permanence
• The three-tiered methodology we use – program, methodology and project-level assessments – to generate independent, evidence-based ratings
• The types of questions and sources of information Calyx Global uses to assess each project