A draft copy of the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, obtained by The Observer, shows the frequency of devastating storms - like the ones that battered Britain last week - will increase dramatically. Sea levels will rise over the century by around half a metre; snow will disappear from all but the highest mountains; deserts will spread; oceans become acidic, leading to the destruction of coral reefs and atolls; and deadly heatwaves will become more prevalent.
· 12 of the past 13 years were the warmest since records began;
· ocean temperatures have risen at least three kilometres beneath the surface;
· glaciers, snow cover and permafrost have decreased in both hemispheres;
· sea levels are rising at the rate of almost 2mm a year;
· cold days, nights and frost have become rarer while hot days, hot nights and heatwaves have become more frequent.
We must act.