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The total biomass on Earth is 550 billion tonnes which at some point would have just been CO2, so that's got to count for something.
I'm not sure how much of a difference that would make. That's less than the total cumulative CO2 emissions of China and the US, and it's 1% of 1% of the total mass of the atmosphere
That’s a good point. My number is all of the current biomass (according to Wikipedia), but all the CO2 we’ve produced since the Industrial Revolution was also originally captured by living things. So add all the gas and coal that ever existed on earth to that number.