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An international body of nearly 100 climate scientists convened by the United Nations have issued a stern warning to the rest of the world.

Unless governments around the globe undertake “unprecedented” action to reverse it, Earth’s temperatures will soar upwards of 1.5-degrees Celsius, or 2.7 degrees Fahrenheit, over preindustrial levels by the end of the century.

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Warming above that threshold, the scientists write, could trigger the near-total loss of the world’s tropical coral reefs and the collapse of ice sheets in Antarctica and Greenland that would send sea levels soaring.

In short, the scientists say the world has only a dozen years to tackle climate change to avoid some of its most devastating effects.

That is the tough-love conclusion of the U.N.’s Intergovernmental Panel on Climate Change, or IPCC, in a major consensus report released Sunday evening after days of discussions last week between scientists and government officials meeting in South Korea.