[s3krit]

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

[bluGill]

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

[Sayrus]

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