The World Bank is warning of the dangers of climate change. A new report says that, unless urgent action is taken, average temperatures will incease by 4°C leading to more extreme heat waves, declining food stocks and a life-threatening rise in sea levels. The study was carried out by the Potsdam Institute for Climate Impact Research. Its director, John Schelluber, explains what will happen if the 4°C temperature rise occurs by 2100.
