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It might be easier to see the economic effects on CO2 emissions by looking at the source terms, rather than the accumulated concentration as expressed by the Keeling curve above.
Interactive chart from here, if you want to play around with different countries and regions.
From what I can see, there was a small disruption in CO2 emissions in 2020, from the COVID shutdowns and resulting economic disruptions. There was also a slight temporary decline around 2009, which was a period of recession.
Your point is still valid, however. Even rather large economic upheavals don’t have a huge effect on world-wide CO2 emissions. It would probably take something on the order of a 1930s-style depression to really have an effect.
_ Pete