'This century has seen the human race enter a condition not previously experienced. Cyclic spells of natural disaster, warfare and horror have always been a part of our existence but I think it is the first time that we have ever felt the fragility of the natural world. It is quite remarkable how a few years ago we might have seen the Amazon basin, for example, as a stupendous and daunting natural phenomenon, a fit setting for danger, adventure and discovery. Now it seems an endangered and delicate ecosystem. And the same could be said of things like the oceans, “smaller” things like the Great Barrier Reef, even smaller things like individual species down to a host of microscopic phenomena. There will be those of course who claim, and have claimed, that this is just politically motivated fear-tactics designed to help a smug middle-class push its agenda in a culture war. A quarter of a century ago this might have been a poor, but at least a tenable, position but it certainly isn’t now. The mongols aren’t just a vague rumour from the East: they really are coming.' (Introduction)