I’ve just done us all a favor. Sure, the North Pole is heating up, the ice caps are rapidly melting. But chill out, the globe spinning in front of me right now, on my monitor, is miles thick in solid ice. Try melting that global warming. Admittedly, I was a little overzealous in my ostensible goal of saving the world. There is no inhabitable land or water left on this planet—at least not for humans and most creatures—only centuries of thick frozen ice to slip around on. That said, humans are probably the worst thing that’s ever happened to Earth, so…