Huffington Post: It seems hardly a week goes by when we don't hear some climatologist or other expert say, "it's difficult to connect one particular weather event to global warming, but..." We heard it this week as communities in Calgary and Southern Alberta were evacuated in the face of extreme rainfall and rising floodwaters. The "but," of course, is that we know burning fossil fuels and pumping carbon dioxide and other heat-trapping greenhouse gases into the atmosphere causes the Earth's average surface temperatures...