What do you want to turn the CO2 into? (I am happy to be educated!)
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One exception: Gasification, followed by ploughing in charcoal (“biochar”), is actually a net carbon negative way to burn fossil fuels while extracting CO2 from the atmosphere. But generally, yeah, those proposals about artificial trees or algae are implausible scifi.
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You need to "plough" it in deep enough to ensure that it will not get in contact with atmospheric oxygen. And do you know how much biomass you'll need to get enough coal to fill in ALL the fossil fuel deposits we emptied?
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You could grow rotting trees: but you need to grow a lot of them i.e. hold carbon in alive trees.
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Yes, but it would take trillions of trees, in addition to the existing plants, to capture 1500Gt. Even if we use all existing and potential agricultural land, it won’t be enough.
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Not necessarily if we managed to retain and more importantly create new swamps.
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