Big ice!

Om oljan tar slut kanske vi inte har tillräckligt med koldioxid för att hindra den permanenta istiden...:

A new analysis of the dramatic cycles of ice ages and warm intervals over the past million years, published in Nature, concludes that the climatic swings are the gyrations of a system poised to settle into a permanent colder state — with expanded ice sheets at both poles.

The Nature paper goes on to propose that humans, as long as they have a technologically powerful society, would be likely to avert such a slide into a long big chill by adding greenhouse gases to the atmosphere. That doesn’t obviate the need to curb such emissions and the prospect of dangerous climate warming in the short run, Dr. Crowley said.