4 ms·

Thanks, though that study makes no mention of CO2, and concerns instead oxygen from 500m, to 1b years ago, which seems a little far off to be applicable to the

Thanks, though that study makes no mention of CO2, and concerns instead oxygen from 500m, to 1b years ago, which seems a little far off to be applicable to the order of the around one hundred and fifty years ago being asked about. Have I missed something?

leptons 2y ago
My comment only explains how it's done. I'm sure you can understand that the article I mentioned was just an example. If you're looking for a specific CO2 measurement from air captured exactly one hundred and fifty years ago, I'll leave you to Google that yourself.
- robxorb 2y ago
  Well, here's the only solid thing with referenced figures that came up. Chart on page one is quite the ride, as I'd have expected for early science: https://21sci-tech.com/Subscriptions/Spring%202008%20ONLINE/CO2_chemical.pdf https://21sci-tech.com/Subscriptions/Spring%202008%20ONLINE/... Everything else I found was unfortunately hand-wavy "scientific consensus says" and the ubiquitous "280ppm" coupled with "pre-industrial" repeated again without reference, nor apparent empirical basis. Not convincing, which for "the science is settled" I'd expect a bit of a higher standard.