August 13, 2017 by Ronjoy Bezbarua
(Source: Scientific American) One of the most powerful climate pollutants on earth, hydrofluorocarbons or HFCs, account for a small portion of U.S. climate pollution, but scientists say it’s important for countries to urgently cut them just because they’re so potent—and growing. Efforts to cut HFCs became more difficult both in the U.S. and globally on Tuesday, when a federal appeals court in Washington, D.C., ruled that the Environmental Protection Agency has overstepped its authority in regulating HFCs under the Clean Air Act. The ruling leaves the U.S. without an immediate legal mechanism to control HFCs, which amount to about 3 percent of U.S. climate pollution. Though that’s a small part of the nation’s greenhouse gas emissions, they’re between about 1,000 to 12,000 times as potent as carbon dioxide, depending on the specific chemicals used to make HFCs. Read full article….