Sir David Attenborough undertakes a personal journey to discover how global warming is changing the planet he knows so well. Examining the evidence for this confusing phenomenon, Sir David finds out whats causing it and whether mankind is to blame. From Hurricane Katrina to the glacier ice crashing into the sea, Attenborough discovers its a race against time. Starving polar bears and the first direct victim of global warming, the recently extinct golden toad, demonstrate that the danger for humanity may not be far behind. Sir David Attenborough explores the personal and technological changes we can make to avert catastrophe.