This is the current concentration of CO2 in the atmosphere

Berkeley CA

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409.8 parts per million The global average atmospheric carbon dioxide in 2019 was 409.8 parts per million (ppm for short), with a range of uncertainty of plus or minus 0.1 ppm. Carbon dioxide levels today are higher than at any point in at least the past 800,000 years. Aug 14, 2020 And it's probably still higher now. It's been going up steadily year by year. Look up "Keeling curve." As I said, it doesn't even matter whether this is causing warming because ocean acidification is killing fish by bleaching corals. We have to stop CO2 emissions for that reason alone.