In 2012 a chemical company in Gujarat earned about $187 million in carbon credits for burning the waste gas from its refrigerant plant. Nineteen such plants generated over half the credits in the Clean Development Mechanism's first six years, because destruction cost under a dollar a tonne while credits sold for ten or twenty euros. The episode traces the design flaw behind it, the additionality test, and the mechanism's wind-down.
The HFC-23 destruction was real and metered, so the critique concerns price, incentive, and over-crediting rather than fraud. The 2016 finding that 85 percent of projects were likely non-additional is a likelihood estimate disputed by developers, and plant manipulation rests on pattern evidence.