Draft of Landmark U.N. Climate Study

January 22, 2007
Draft of Landmark U.N. Climate Study

"Certainly, it will say that global warming is happening, and secondly, that it is due to humans," said Kevin Trenberth, a climate scientist at the National Center for Atmospheric Research and one of the lead authors of the report. "The whole weight of the evidence has simply increased to show that stuff is already happening."

Basic findings, which scientists do not expect to change before the Feb. 2 publication, include even more certainty — greater than 90 percent — than they had five years ago that people are driving the global rise in average temperatures since the mid-20th century.