Climate explained: what the world was like the last time carbon dioxide levels were at 400ppm – The Conversation AU

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Climate explained: what the world was like the last time carbon dioxide levels were at 400ppm – The Conversation AU

The last time global carbon dioxide levels were around 400ppm was four million years ago. On average, the world was 3℃ warmer, but in high northern latitudes, it was up to 14℃ warmer than today.
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