Edge of Forever - Earth's endgames
The series of novels Edge; Edge, Blue and Edge, Red discuss Earth after a major series of dystopian catastrophes. Fortunately, Earth has found an additional source of energy and transport by bringing magnetite back from Ganymede, a moon of Jupiter.
Edge, Blue and Edge, Red which deal with the end situation of Edge in two different ways. Some building blocks of the solution are similar, but the result creates two very different stories. Both Edge, Blue and Edge, Red start at the same moment but diverge in their outlook. Events from 300 years previously and described in the novel Pulse also surface in Edge, Red.