It made little sense for Calgary city councillor Sean Chu to imply on Twitter that a cold Calgary winter calls global warming into question. Many, including Calgary Mayor Naheed Nenshi, mocked Chu's extrapolation. Which is sort of fair. Chu was being illogical. Yet, it's interesting to note that those advocating for the environment are guilty of similar fallacies quite often. When deadly Typhoon Haiyan struck the Philippines earlier this year, everyone from Prince Charles to John Kerry linked the one storm with anthropogenic climate change, which is scientifically impossible to do. Why weren't they mocked too?