Mongabay: The U.S. Environmental Protection Agency on Friday ruled that carbon dioxide and other greenhouse gases “may endanger public health or welfare”, a finding that opens to door to future regulation of such emissions under the the Clean Air Act. The agency said its proposed endangerment finding “is based on rigorous, peer-reviewed scientific analysis of six gases – carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulfur hexafluoride – that have been the …