It's been over twenty years since Elgin and Singhal and their crowdsourced sunshield saved the world from runaway climate change. Or at least bought the world a little time.
Now, in a bold new world where the people have started to gain power over the old elites, and the first uncertain steps are being taken to move offplanet, there are alliances at work to take control of the sunshield — even if that means destroying it — and to reverse the progress that has been made.