Climate Desk: To understand the craziness that just went down on the floor of the U.S. Senate, you first have to understand the overwhelming scientific consensus on climate change. It`s pretty simple, actually: The planet is getting warmer, largely because humans are releasing heat-trapping gases like carbon dioxide. Or, as the world`s leading climate scientists put it in a recent report from the U.N.`s Intergovernmental Panel on Climate Change, "Warming of the climate system is unequivocal," and it`s "extremely...