Most of us have heard of global warming. Hardly a day goes by without something in the newspaper or on TV to convince us that we are on the brink of a disaster of our own making. The ice caps are rapidly melting, thousands of species are facing extinction, and regular floods, droughts and hurricanes prove that weather patterns all over the world are changing. Given the steady stream of reports and the sheer scale of the problem, it is hard not to want to do something about it at a personal level. The problem is that the "solutions" seem so trivial.