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WASHINGTON (AP) – A U.N. report says limiting global warming to just under a single degree could mean the difference between life and death for many people and ecosystems.

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But the scientists behind the report have little hope the world will rise to the challenge.

(Photo by NASA via Getty Images)

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The Nobel Prize-winning Intergovernmental Panel on Climate Change issued the report on Sunday at its meeting in South Korea.

The nations of the world have set a goal of limiting warming of the planet to 1.8 degrees Fahrenheit, or a single degree Celsius. But the scientists say there would be a big difference if that goal were cut in half.

If that happened, they say, there would be fewer heat waves, downpours and extinctions, less sea-level rise and more coral reefs and ice sheets.

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