That’s the conclusion of scientists who have been drilling deep into the Greenland ice sheet since 2007, in a Danish-led project known as the North Greenland Eemian Ice Drilling (NEEM). Their results, published Wednesday in a landmark paper in Nature, show that temperatures rose some 8°C (14.5°F) higher than they are today during the so-called Eemian period, a stretch of natural global warming that occurred between about 115,000 and 130,000 years ago.