You’ve heard of Dune. Mostly desert, but desert like the ocean, over most of the world. Though there is ocean in this world, it’s dry here, too (but without the spice worms). Until suddenly it’s not. It’s dead and barren, until suddenly it comes to life. It’s covered with green clouds. Until suddenly they divest themselves of green. Then the desert revives. And it’s not dry. For a week or so, anyway. Then it’s desert again.