If the law of diminished returns applies to CO2 and increased temp where does the temperature peak?

The relationship between C-O2 and increased temperature is approximately logarithmic, but that doesn't mean that additional C-O2 won't raise the temperature: It just means that a given incremental increase in the C-O2 concentration will have less of an effect.

So there is no point at which additional C-O2 has zero effect.

Sorry.

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