Ancient moss, insects found in Antarctica

Geoscientist Adam Lewis of North Dakota State University was studying the ice cover of the continent when he and co-workers came across the remains of moss on a valley floor.

clipped from news.yahoo.com For 50 million years the Earth has been cooling, he said. "As it cools it crosses thresholds. This is one, when Antarctica became permanently frozen and locked up." "You have to understand where these thresholds are," he added, "Because, if human beings are unfortunate enough to push climate over one of these thresholds, it could be a total catastrophe."