Guardian: Extreme weather is hampering attempts by a team of three British explorers to examine the effects of climate change on Arctic sea ice around the north pole. The Catlin Arctic Survey mission, led by Pen Hadow, is travelling about 600 miles on foot to the pole, and set off on 2 March. Despite rigorous testing before the expedition, a pioneering radar system designed to establish ice thickness without drilling and an onboard sledge computer kit have both been disabled by brutally cold …