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Lumifer comments on Post ridiculous munchkin ideas! - Less Wrong
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I'll ask a simpler question. What is the best (in terms of heavy-metal concentration as % of biomass) that a flowering plant can do?
(Still haven't got to read stuff on that, maybe I'll be more lucky next week. After five minutes by the clock thinking about the idea and its alternatives, have two results: 1) I think veeery slowly, 2) maybe it's possible to make a thin porous cable stuffed with enzyme analogue to download HM directly from the soil, collect them on electrodes once they are in, and extract massively in a special facility.)
To extract heavy metals from the soil you need a LOT of contact surface. Roots excel at this, cables, not so much.
I know. Still might be more feasible.