Common sense on climate change is pinned down by crossfire among the three branches of US government.Congress is contriving cap-and-trade legislation that would expensively overhaul energy markets and has potential, according to a report for the American Petroleum Institute by Ensys Energy, to shutter a third of US refining capacity by 2030. The Obama administration craves a climate change bill to flaunt at an international summit on the subject in December. So the Environmental Protection Agency threatens to exercise authority it received in a 2007 Supreme Court decision to regulate greenhouse gases under the Clean Air Act. That decision, which will be activated when EPA makes final its ...