Rapture of the Nerds (New edition) [Doctorow, Cory]

Welcome to the fractured future, at the dusk of the twenty-first century. Earth has a population of roughly a billion hominids. For the most part, they are happy with their lot. Those who are unhappy have emigrated, joining the swarming densethinker clades that fog the inner solar system with a dust of molecular machinery so thick that it obscures the sun. The splintery metaconsciousness of the solar system has largely sworn off its pre-post-human cousins dirtside, but its minds sometimes wander