If you were worried by James Lovelock's book Revenge of Gaia, you will be scared stiff by Fred Pearce's version of the same story. His message is essentially that human impacts on the climate and other ecological features of our planet are reaching a tipping point where it will be impossible to reverse the changes, whatever we do. The evidence is that ice caps don't take thousands of years to melt, for example, but could go in a rush so that sea level rises by 30 metres in ten years, before the end of this century. If you live in London or round the coast, think what that means. And it's just one of he threats we face. Pearce's writing style is very direct and personal, like reading a good quality newspaper, and he pulls no punches. Buy a copy and send it to your MP.