Down to Earth

Meltdown countdown


ice sheet in North America is doomed to disappear fast. The Barnes Ice Cap is melting at a rapid pace, driven by increased greenhouse gases that have elevated Arctic temperatur­es. The ice cap, now 500 metres thick, is slated to melt in about 300 years under business-as-usual greenhouse gas emissions. The results provide compelling evidence that the current level of warming has never happened in the past 2.5 million years.

Geophysica­l Research Letters, March 20

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