Collapse of Arctic Sea Ice 'Has Reached Tipping-Point'

There are multiple "tipping points" in climate change - points at which comparatively rapid change starts to occur from which it is hard to recover and return to the original climate state. Some of the tipping points are expected to be reached in a decade or two if we do nothing. This one, however, may be imminent.

A catastrophic collapse of the Arctic sea ice could lead to radical climate changes in the northern hemisphere according to scientists who warn that the rapid melting is at a "tipping point" beyond which it may not recover.

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