Mother of Storms
John Barnes
 In the early 21st century, the earth suffers from a giant hurricane spawned by the release of clathrate compounds, as the result of a nuclear explosion. While the hurricane spawns hundreds of progeny, which by novel's end kill at least 1 billion people, two massively computer augmented human intelligences, both of whom witness their organic bodies die, race to corral a comet from beyond Pluto's orbit. They use the ice from the comet to reduce earth surface temperatures, and quell the mother of storms.