World Engines: Destroyer Stephen Baxter
Hundreds of years in the future, on a stagnating and almost empty Earth, a space shuttle pilot from the early days of the 21st century is awoken from the cryogenic sleep he entered after a devastating accident.
As he comes to terms with this new world, he begins to realise that their history does not match what he remembers - and that only he may be able to stop the coming catastrophe destined to destroy the planet.
Until he meets a young woman who seems to have a drive of her own, and a plan...