The March 2020 issue of Fortune magazine focused on the "existential threat" to the Earth posed by global warming, despite the fact that no significant global warming seems to be taking place. With its appealing cover art — an image of the Earth tied up in a plastic trash bag — this issue is just what I'd expect from a liberal outfit. It's typical of climate alarmists to begin by assuming their premise: warming is an existential threat because, well, it is. And anyone who questions that premise is a criminal. Just what is meant by "existential threat" is a...