Ottawa - The ice sheets covering the Arctic seas have thinned noticeably over the last seven years, most likely as a result of global warming, said a Norwegian explorer who has just skied alone across the top of the world.
Mr Boerge Ousland, speaking after an 82-day trip in which he travelled 2,100 km from the northern tip of Russia to the North Pole and then down to Canada, said yesterday he had seen other evidence which hinted strongly at the effects of climate change.