Given how times have changed, it’s amusing to see the specter of a ‘greenhouse cliff’ looming over the world, with no one believing at first that such a thing is even possible. Nowdays, you’ll see arguments over if it’s happening or not (more and more rarely) and if we caused it in the first place (of course we did), but you’d be hard pressed to find too many people that have never even heard of the idea. That’s what you get for reading near future sci- fi written a quarter century ago I guess. It’s a straight forward enough plot with a few twists through politics, squatters on the moon and natural disasters and an engaging read. I find myself increasingly interested in what happens to this other Earth.