Sea ice melts off the beach of Barrow, Alaska, where Operation IceBridge is based for its summer 2016 campaign. Kate Ramsayer/NASA hide caption

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As July's Record Heat Builds Through August, Arctic Ice Keeps Melting

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A typical apartment building in Roslyakovo. Russian President Vladimir Putin signed papers ordering the town to open its doors to the world on Jan. 1, 2015. Mary Louise Kelly/NPR hide caption

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A Once-Closed Russian Military Town In The Arctic Opens To The World

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The new Russian nuclear-powered icebreaker Arktika launches in St. Petersburg, Russia, on Thursday. Russia has been modernizing its icebreaker fleet as part of its efforts to strengthen its Arctic presence. Evgeny Uvarov/AP hide caption

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Nuuk, Greenland's capital, hosted about 2,000 people for this year's Arctic Winter Games. It was the biggest event ever held in Greenland. Rebecca Hersher/NPR hide caption

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At Arctic Winter Games, Biathlons, Stick Pulls And Sledge Jumps

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Floodwaters from rising sea levels have submerged and killed trees in Bedono village in Demak, Central Java, Indonesia. As oceans warm, they expand and erode the shore. Residents of Java's coastal villages have been hit hard by rising sea levels in recent years. Ulet Ifansasti/Getty Images hide caption

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Science Confirms 2014 Was Hottest Yet Recorded, On Land And Sea

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The Polar Star completes ice drills in the Arctic in July 2013. Built in the 1970s and only meant to last 30 years, the vessel is the U.S. Coast Guard's only heavy icebreaker. U.S. Coast Guard/Reuters/Landov hide caption

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As The Arctic Opens Up, The U.S. Is Down To A Single Icebreaker

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To put their probes into the Arctic Ice, researchers hitched a ride on a South Korean icebreaker. Courtesy of Craig M. Lee/University of Washington hide caption

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Navy Funds A Small Robot Army To Study The Arctic

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Icehotel is located 120 miles above the Arctic Circle. The temperature outside is well below zero, but inside the hotel — while still, of course, below freezing — it's much warmer, hovering in the low 20s. Ari Shapiro/NPR hide caption

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The Arctic Circle's Coolest Accommodations Turn 25 Years Old

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A lone polar bear poses on a block of arctic sea ice in Russia's Franz Josef Land. iStockphoto hide caption

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Arctic Is Warming Twice As Fast As World Average

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Pumpjacks at the Inglewood oil fields in California in March. Some of the most controversial methods of oil extraction, like fracking, oil sands production and Arctic drilling, are also expensive. That's made them less profitable as the price of oil continues to fall. Richard Vogel/AP hide caption

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Falling Oil Prices Make Fracking Less Lucrative

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The Erebus and the Terror among icebergs, as illustrated in The Polar World by G. Hartwig in 1874. Sir John Franklin, British naval officer and arctic explorer, commanded the 1845 expedition of the ships to search for the Northwest Passage. All members of the expedition perished. G. Hartwig/Universal History Archive/Getty Images hide caption

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