On Thursday, the Environmental Protection Agency is expected to roll back the endangerment finding, which underpins the US’s ability to regulate the greenhouse gases that cause climate change. The endangerment finding is a 2009 ruling that creates a scientific and legal basis for regulating greenhouse gases under the Clean Air Act. Even before the endangerment finding officially came into existence, it was already a political football for right-wing interests. The endangerment finding has proven remarkably difficult for these groups to attack. “There's just all kinds of arguments, all of them without merit—Clean Air Act arguments, science arguments, cost arguments.”