There has been permanent ice on the Earth for over 2.5 million years. The amount of ice has changed from time to time. Mario Krapp from University of Cambridge has led a team which simulated 800,000 years of global climate change.
Warmer conditions in the Arctic may lead to severe clouds of pollution in many cities in Asia, including Beijing and Delhi. With climate change models prediction increased temperature increases in the Arctic this will have wide reaching impact on human health in Asia.
Continued intense burning of fossil fuels will damage one cloud type to such an extent that it may add another 8°C to the global temperature. So much so that it would prevent humans from living in certain parts of the tropics.