Arctic ice levels are measured by several parties, including government agencies, organizations, and private citizens. NASA has been measuring Arctic and Antarctic ice since the late 1970s. A group of three British explorers went on a expedition to measure the arctic ice cap in March, 2009. It has been difficult to measure the ice directly until recently, when NASA produced a map of the entire Arctic ice sheet for the first time. They use satellite imagery taken over years’ time to help make their maps.
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