Guardian: What happens if we do nothing? If, in other words, we do as Vaclav Klaus and many other suggest, and let climate change take its course? Six years ago the climate modellers at MIT suggested that the median probability was a global temperature rise of 2.4C by 2100. Since then they’ve refined the model. Now the median estimate is 5.2C by 2100. This is another way of saying the end of life as we know it. What has changed? Unlike other models, MIT’s Integrated Global Systems Model …