Some scientists claim that the ice age atmosphere was "warm!"

Researchers at the University of Birmingham recently dug up some interesting bits of our past. When studying limestone rocks, they found evidence that large amounts of greenhouse gas coincided with a prolonged period of freezing temperatures.

This suggests that 630 million years ago, the Earth had a warm atmosphere full of carbon dioxide but was completely covered with ice.

The university school of geography, earth, and environmental sciences warned that this could happen again if global warming is not curbed.

Dr. Ian Fairchild, the lead investigator, said: “We came up with an independent test of a theory that the earth, like a baked Alaska pudding, was once hot on the outside, surrounding a cold icy surface. It happened naturally in the past, but the use of the wrong technology could make it happen again.”