Answer:PARIS, FRANCE -- The loss of billions of tonnes of ice from Earth's frozen spaces is likely to increase global temperatures by an additional 0.4 degrees Celsius, according to research Tuesday highlighting the danger of a "vicious circle" of warming.
Arctic summer sea ice levels have declined by more than 10 percent each decade since the late 1970s and mountain glaciers have shed roughly 250 billion tonnes of ice annually over the last century.
Ice loss from the West Antarctic and Greenland ice sheets is accelerating and already outstripping what scientists until recently believed to be the worst-case melt scenarios.
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