guest_writer 0 2005-09-18T00:00:00Z A record loss of sea ice in the Arctic this summer has convinced scientists that the northern hemisphere may have crossed a critical threshold beyond which the climate may never recover. Scientists fear that the Arctic has now entered an irreversible phase of warming which will accelerate the loss of the polar sea ice that has helped to keep the climate stable for thousands of years. Th... Steve 41149 false false false false 2005-09-18T00:00:00Z Connor 8761 5379 0 1 Global Warming global-warming-past-the-point-of-no-return-by-steve-connor Global Warming 'Past The Point Of No Return' 2009-09-25T04:44:34Z 11571