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The good news: Sea level has risen by just a half-inch in the past 20 years as a result of shrinking ice. The bad news: The melting is now speeding up. Over the next century, this could contribute to another 2- to 3-foot rise in sea level — enough to flood New York City every few years.
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A pair of NASA satellite images taken just four days apart tells a potentially worrying story of melting ice in the polar summer.
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Satellite images show that from July 8 to July 12, nearly all of the ice sheet covering Greenland had experienced some melting. According to NASA, it's the biggest summer melt in more than 30 years.