VCS Quality Assurance Principles

VCS quality assurance principles ensure all VCUs represent GHG emission reductions or removals that are real, measurable, additional, permanent, independently verified, conservatively estimated, uniquely numbered and transparently listed. To that end, all VCS projects and VCUs are:


Quality Assurance Diagram

Additional: Projects must exceed the likeliest “business-as-usual” scenario and demonstrate that GHG emission reductions or removals would not occur without revenue from the sale of VCUs.

Real, measurable and conservative: Projects must apply an approved methodology to ensure net GHG emission reductions or removals which must have already taken place, and are measurable.

Conservative: Projects must use conservative assumptions, values and procedures to ensure emission reductions are not overstated.

Permanent: Projects in the Agriculture, Forestry and Other Land Use (AFOLU) sector must ensure GHG removals are not lost due to unforeseen events such as fire or disease.

Independently verified: Projects must contract an approved validation/verification body (VVB) to confirm that the project design meets VCS criteria and that all GHG emission reductions or removals are quantified according to VCS requirements.

Uniquely numbered and transparently listed: Projects must register with the Verra Registry to ensure each VCU is assigned a unique serial number and listed on the  registry. Further, key safeguards are put in place to prevent double counting of emissions reductions across different GHG programs.

Other Programs

Jurisdictional and Nested REDD+ (JNR)

Driving private investment in REDD+ at multiple scales

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Photo: Paul Vincent

Verified Carbon Standard

The VCS Program is the world’s leading voluntary program for the certification of GHG emission reduction projects

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Initiative for Climate Action Transparency

Supporting countries around the world in the evaluation of the climate, sustainable development and transformational impacts of their policies and actions 

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