A glacier disappears in the Peruvian Andes. Floodwaters surge across the English countryside. Ten thousand Pacific islanders begin to evacuate their homeland. Even as scientists debate the specifics, global warming is hitting people's lives, not in the future but today. In this ground-breaking book Mark Lynas reveals the evidence - painstakingly collected over three years of travelling around the world - of the dangers that lie ahead if nothing is done. As catastrophe beckons, nobody who reads this book will be able to look back and say 'I didn't know'.