NASA: Arctic sea ice hit its fourth lowest level on record

A graphic showing the Arctic sea ice level on Sept. 11, 2015.
(Image credit: YouTube.com/NASA)

NASA says that an analysis of satellite data shows that the amount of late-summer Arctic sea ice is at its fourth lowest point on record.

The Arctic sea ice cover is frozen seawater that reflects solar energy back to space, helping keep the Earth cool. It gets smaller or larger depending on the season, and its minimum summertime extent occurs at the end of the melt season; NASA says the late-summer minimum size has been decreasing since the late 1970s due to warming temperatures. Analysis by NASA and the NASA-supported National Snow and Ice Data Center shows that on Sept. 11, the annual minimum extent was 1.70 million square miles, 699,000 square miles lower than the 1981-2010 average.

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Catherine Garcia, The Week US

Catherine Garcia has worked as a senior writer at The Week since 2014. Her writing and reporting have appeared in Entertainment Weekly, The New York Times, Wirecutter, NBC News and "The Book of Jezebel," among others. She's a graduate of the University of Redlands and the Columbia University Graduate School of Journalism.