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CFCs (chlorofluorocarbons) are banned because of the damage they do to the Earth's upper atmosphere. But alarmingly it seems that CFC manufacture may not be a thing of the past. Emissions of CFC-11 have climbed 25 percent since 2012. Durwood Zaelke is the founder of the Institute for Governance and Sustainable Development and an expert on the Montreal Protocol, the agreement to ban CFCs. H speaks to Jesse from Washington DC.