Is our climate cooling down or warming up? A new study of past climate data reveals that, despite previous belief, there has been a consistent global warming trend over the last 10,000 years, rather than a period of global cooling before humans intervened.
"We have been building models and there are now robust contradictions," lead study author Zhengyu Liu, of the University of Wisconsin-Madison, said in a news release. "Data from observation says global cooling. The physical model says it has to be warming."