0:00:01.950,0:00:05.240
Why is 1.5 degrees such a big deal?

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Because to warm our entire planet up[br]by 1.5 degrees Celsius

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requires a lot of heat.

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All this extra heat melts glaciers,[br]which raise sea levels.

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If the ice sheets of Antarctica[br]and Greenland melt completely,

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millions of people's homes[br]will be under water.

0:00:22.850,0:00:25.200
The extra heat also intensifies weather,

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making wet places wetter,[br]dry places drier

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and increasing the ferocity of storms.

0:00:30.660,0:00:34.740
That 1.5-degree increase[br]also won't be distributed evenly.

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The coldest nights in the Arctic[br]might get 10 degrees warmer.

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The warmest days in Mumbai[br]might get five degrees hotter.

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Over the past 10,000 years,[br]we've been lucky.

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Earth's climate was stable[br]and our civilizations flourished.

0:00:48.260,0:00:53.720
But as our climate gets more unstable,[br]so will our economies and our societies.

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We'll all suffer,

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and the vulnerable will be hit hardest,

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unless we act now.

0:01:02.363,0:01:03.973
[Countdown

0:01:03.973,0:01:06.753
Take action on climate change[br]at COUNTDOWN.TED.COM]