I remember something about kelp being very efficient
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Kelp: What can't it do?!
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Not a climate scientist, but I’ve found this list encouraging:https://www.drawdown.org/solutions
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Sure, but that's different than, "is this an effective sink." I'm all for more trees and forests (ignoring the mono cropping issue). But, I thought the lifetime sequestration was rather narrow.
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The problem I have with these things is that they must not be mistaken for real solutions to "we're emitting CO2". Reforestation, once it reaches equilibrium, is a one-shot. And even replacing all the forests we've burned will never undo the fossil fuels we've burned.
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By all means, we should reforest, and rebuild our soils. It may make a huge difference to our fate. But it won't give us license to continue to emit.
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This article from last year describes researchers using both poplar trees and switchgrass for BECCS.https://www.sciencemag.org/news/2018/02/vast-bioenergy-plantations-could-stave-climate-change-and-radically-reshape-planet …
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This paper orders the biomass yields of the five main bioenergy crops as follows: eucalypt > Miscanthus > willow > switchgrass > poplar https://www.nature.com/articles/sdata2018169#t1 …
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