What impact does carbon have on global temperatures?

"Not enough to shake a stick at, really. I mean, it's most likely that if we- when we reach a doubling of carbon dioxide in the atmosphere compared with before the industrial revolution, will have raised the global average temperature by something on the order of two degrees Celsius. That's actually good because we're coming out of the Little Ice Age. It was really, really tough. Cold kills about 20 times as many people per day as heat waves do." -E. Calvin Beisner, Ph.D.

@ EconomicWarRoom