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Any interesting links around why 350 is the target? I searched and everyone keeps quoting the same climate guru without any reasoning behind why that number specifically was chosen.

CO2 was below 400 PPM for the last 5 million years and around 350 PPM was the last 100 000 years. It's just the number the nature stabilized at, before human civilization changed it.

Historically life endured all kinds of PPM up to 2000 and above. So probably nature will adapt.

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