Last time the Earth was this warm, 130,000 years ago, England's Thames Valley was home to hippos and elephants, write Emma Stone & Alex Farnsworth. But the closest climate analogue is actually the Miocene Climate Optimum, 11 million years ago, when CO2 levels were similar to today's. As for the ice age that's due, scientists believe it will be postponed for at least 100,000 years.
