all the green house gas getting released today was in the biosphere previously
but a specific type of cellulose was indigestible to microbial life causing a massive build up of hydrocarbons. some of the build-up burnt in massive catastrophic fires. some of it was just buried under ground by sedimentary process. that's the oil we are using now
so the earths biosphere can definitely absorb the CO2 as it came from there in the first place. its still going to do some damage in the short term
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