Global warming: National Geographic map shows 'striking' retreat of Arctic ice sheet

National Geographic has produced an animated gif showing the "striking" retreat of Arctic ice that has occured over the last few years.
The images, taken from National Geographic atlases from 1999 to 2014, show a substantial reduction in the Arctic ice sheet, caused as the ocean heats up due to global warming.
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Available on the publication's website, the gif comes in the wake of President Barack Obama's unveiling of his 'clean power plan'.
Announcing the plan, which aims to help tackle global warming by reducing emissions from US power plants, Obama commented: "Shrinking ice caps forced National Geographic to make the biggest change in its atlas since the Soviet Union broke apart."
National Geographic appears to concur with the president. It noted that the shrinking of the Arctic ice sheet, illustrated in the 10th edition of its atlas, "is one of the most striking changes in the publication's history".
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It said the ice had retreated further still since the atlas was published in September 2014.
"You hear reports all the time in the media about this," Juan José Valdés, a geographer with National Geographic.
"Until you have a hard-copy map in your hand, the message doesn't really hit home."

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