A nuclear war between India and Pakistan, triggered by conflict over water resources and the starvation resulting from the collapse of the Indus river system. A militarized 'fortress America' keeping back hordes of starving Mexicans with a fence topped with automatically controlled machine guns. War in the newly melted Arctic ocean over the scraps of remaining hydrocarbons. And those are just the cheerful scenarios; we may also have a total wipeout of almost all life on Earth to look forward, as the oceans go rotten with hydrogen sulphide which then bubbles up to destroy the atmosphere.
Dyer's book contains eight scenarios for possible futures, each of which is used to powerful effect to introduce a discussion of the science and politics of climate change. These discussions are well-written, clear and non-technical, but with plenty of persuasive and compelling detail. If you know nothing about the IPCC, or Kyoto, or the shambolic Copenhagen Accord, you could find a lot worse places to start than here.
Dyer's background is in military history, but he's clearly taken the time to engage with a lot of scientists, engineers and environmentalists, and it really shows. Not everyone - especially not most of the environmentalists - will feel happy with his ultimate recommendation; at the end of the day this book is a bleak, reluctant, pessimistic manifesto for geo-engineering, which Dyer feels we need to develop at least as a fall-back for if everything else fails. It's hard to read the book without being driven to the same conclusion.