Guardian: High rates of obesity in richer countries cause up to 1bn extra tonnes of greenhouse gas emissions every year, compared with countries with leaner populations, according to a study that assesses the additional food and fuel requirements of the overweight. The finding is particularly worrying, scientists say, because obesity is on the rise in many rich nations. “Population fatness has an environmental impact,” said Phil Edwards, from the London School of Hygiene and Tropical Medicine. …