CA SB390

Establishes new regulations prohibiting persons from verifying, certifying, issuing, maintaining on registries, or selling voluntary carbon offsets if they know or should know the greenhouse gas reductions or removal enhancements are unlikely to be quantifiable, real, and additional.

Prohibits marketing or selling voluntary carbon offsets with durability less than the atmospheric lifetime of carbon dioxide unless explicitly marketed as not being physically equivalent to carbon dioxide's climate impact.

Prohibits marketing or selling voluntary carbon offsets where associated greenhouse gases have atmospheric lifetimes shorter than carbon dioxide unless explicitly marketed as not being physically equivalent to carbon dioxide's climate impact.

Defines key terms including "quantifiable," "real," "additional," "durability," "offset project," and "voluntary carbon offset" to establish standards for carbon offset verification and trading.

Violations are subject to civil remedies but are not criminal offenses.