You often hear climate change described as a global conflict with existential consequences. As Rep. Alexandria Ocasio-Cortez once put it, "This is our World War II." It would be interesting to know what survivors of, say, Guadalcanal or the Bataan Death March think of that comparison. But never mind. Let's take the hyperbole seriously. If global warming is a war, who is our enemy? Who are we fighting? First on the list would have to be double agents. These are the people who pretend to be on the side of righteousness but in fact are doing the work of dark...