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Robert W Turner says:
No no no! Ignore reality and look at this computer model please.
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cirby says:
Shorter version?
If the residence time of CO2 is really (for example) 100 years, then we should have a lot more than 400 ppm in the atmosphere right now.
Anthropogenic CO2 supposedly counts for about +6 ppm per year (when counting fuel burned). Over the last fifty years, that’s a good solid +300 ppm – in an atmosphere that’s only seen an 80 ppm increase.