VCM (Voluntary Carbon Market)

The Voluntary Carbon Market (VCM) refers to the trade in carbon credits that occurs outside of legally mandated emissions trading systems such as the EU Emissions Trading System or California's cap-and-trade program. In the VCM, buyers — typically corporations pursuing net-zero or carbon-neutrality pledges — purchase credits representing one metric tonne of CO₂-equivalent that has been reduced, avoided, or removed by a project elsewhere, such as a reforestation initiative, a methane-capture facility, or a cookstove distribution program.

Credits are issued and certified by independent standard-setters. The largest are Verra (which administers the Verified Carbon Standard, or VCS), the Gold Standard, the American Carbon Registry, and the Climate Action Reserve. Each maintains a registry where credits are issued, transferred, and retired once used against a claim.

The VCM has grown rapidly but faces persistent integrity concerns. Investigations published in 2023 by The Guardian, Die Zeit, and SourceMaterial alleged that a large share of Verra-certified rainforest credits did not deliver real additional emissions reductions, prompting Verra's CEO to step down and triggering methodology reforms. In response, two governance bodies have emerged: the Integrity Council for the Voluntary Carbon Market (ICVCM), which sets supply-side "Core Carbon Principles," and the Voluntary Carbon Markets Integrity Initiative (VCMI), which addresses demand-side claims.

The VCM intersects with the compliance world through Article 6 of the Paris Agreement. Article 6.2 allows bilateral trading of Internationally Transferred Mitigation Outcomes (ITMOs), while Article 6.4 establishes a UN-supervised crediting mechanism. Host countries must decide whether to authorize VCM credits for transfer abroad, which requires applying a "corresponding adjustment" to avoid double counting.

For delegates, key debates include: additionality, permanence (especially for nature-based projects), indigenous and community rights, and whether offsets enable corporate greenwashing or finance genuine mitigation in developing economies.