Why does just 1.5C° of heating make such a significant difference on Earth’s climate and environment?
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You’re looking at the average global temperature. Which is the average temperature everywhere all year long.
However the 1.5 won’t be a 1.5 increase to everywhere all year long.
It will be minimal increases in many places (possibly decreases) and turbo increases for short periods in some places, and really bad increases for long periods in other places.
For comparison, the last ice age had Chicago covered in an ice sheet a mile thick.
The global average temperature was only 6 C cooler than now.
So 1.5 C is about a quarter Ice age in temperature change.
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