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1888 is very much not 'pre-industrial revolution', which had started over 100 years prior.

True, but 1888 had much less CO2 in the air. Or so we assume, we didn't measure it.

Actually we do have measures of it based on ice cores. We went from ~280ppm at the time to over 400ppm today.

I forgot about that we have that data. Thanks for the correction.