But there's also a blooming black market in greenhouse gases. HFCs are commonly used in refrigerators and air conditioners, but they're also potent greenhouse gases. There's been a thriving black market for climate-altering refrigerant chemicals since the 1990s, at times as lucrative as selling cocaine. KAMIL KRZACZYNSKI/AFP via Getty ImagesThe black market "comes with the territory" of regulation, Doniger said. At the height of the CFC black market, many cars still used those refrigerants for their air conditioners.

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