Nineteen manufacturers, most of whom are in China and India, have ramped up production of a common air-conditioning coolant, counting on a windfall for destroying a byproduct under a United Nations carbon credits program.

The United Nations and the European Union, through new rules and an outright ban, are trying to undo this unintended bonanza. But the lucrative incentive has become so entrenched that efforts to roll it back are proving tricky, even risky.

Many environmental experts fear that if manufacturers are not paid to destroy the waste gas, they will simply resume releasing it into the atmosphere.

nytimes.com

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