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Intense, world-changing climate change has been with us since long before fossil fuels. This is yet another instance.

I am interested in the scientific methodology that rules out such variations and confirms that fossil fuels are in fact responsible.

The time period is an obvious one: we seem to be seeing spikes in one century vs millennia. But the details of those spikes matter in comparison to our total historical record; hence the curiosity.



This xkcd shows the long time graph into perspective with relevant notes : https://xkcd.com/1732




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