Obese people are contributing to the world food crisis and climate change, experts say. The London School of Hygiene and Tropical Medicine calculated the obese consume 18% more calories than average. They are also responsible for using more fuel, which has an environmental impact and drives up food prices as transport and agriculture both use oil. The result is that the poor struggle to afford food and greenhouse gas emissions rise, the Lancet reported. It comes as the World Health Organization predicts the obese population will double by 2015 to 700m. In the UK, nearly a quarter of adults are...