Global Warming on Thin Ice

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Disko Bay, Greenland, where remains of the Ilulissat Glacier float toward the North Atlantic. (James Balog/Extreme Ice Survey)

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Icebergs, Ilulissat Isfjord, Greenland. (James Balog/Extreme Ice Survey)

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Aerial view of meltwater on the Greenland Ice Sheet. (James Balog/Extreme Ice Survey)

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Icebergs from Jökulsárlón, Iceland, break into small chucks like these so-called ice diamonds, which contribute, drop by drop, to the rise of global sea level. (James Balog/Extreme Ice Survey)