And exactly how much carbon they remove can vary quite a bit based on variables like the health of the vegetation. “One of the major risks of some of these biology-based proposals is that an assumption gets made that you can easily equate X number of trees to X million tons of carbon without actually looking at what kinds of trees they are, and where they’re being planted,” says Cox. The amount of captured carbon might end up being negligible. “You have a lot of trees, which is brilliant. You haven’t necessarily got the climate benefits.”
Another technique known as bioenergy with carbon capture and storage, or BECCS, also relies
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