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[Kristen] Why is 1.5
degrees such a big deal?

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Because to warm our entire
planet up by 1.5 degrees Celsius

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requires a lot of heat.

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

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If the ice sheets of Antarctica

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and Greenland melt completely,

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millions of people's
homes will be underwater.

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The extra heat also intensifies weather,

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making wet places
wetter, dry places drier,

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and increasing the ferocity of storms.

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That 1.5-degree increase also
won't be distributed evenly.

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The coldest nights in the Arctic

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might get 10 degrees warmer.

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The warmest days in Mumbai
might get five degrees hotter.

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

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Earth's climate was stable and
our civilizations flourished.

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But as our climate gets more unstable,

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so will our economies and our societies.

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We'll all suffer and the
vulnerable will be hit hardest

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unless we act now.