Food shortages caused by global warming may be cause of world-wide unrest - Whittier Daily News

Bill Patzert, a climatologist at NASA's Jet Propulsion Laboratory, says sure - but not yet.

"I'm a big global warming person, and I think climate change in the next century will be the largest determinant of human civilization," he said.

"(But) this is not global warming, not yet. It definitely will be in the next century. The change in global temperatures has been about one degree over the last century," he said, adding, "We've had some pretty extreme weather here, but not unprecedented droughts and floods."