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Arctic sea ice 6th lowest, but rebounds from 2012
This image provided by the National Snow and Ice Data Center shows the Arctic sea ice extent on Sept. 13, 2013 in white. The orange-colored border surrounding it shows the median extent for Sept. 13 from 1981-2010. The amount of ice in the Arctic Ocean shrank this summer to the sixth lowest level, but thatís much higher than last yearís record low, according to The National Snow and Ice Data Center in Boulder, Colo. on Friday, Sept. 20, 2013. The ice cap at the North Pole melts in the summer and grows in winter; its general shrinking trend is a sign of global warming. (AP Photo/National Snow and Ice Data Center)

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