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What would you do with the mushrooms, though? Presumably one wouldn't want to eat them once they'd absorbed a bunch of heavy metals, right?

Safely dispose of them. Neither would be safe to consume, but would help clean up the environment a great deal. The (not-thoroughly considered) business model would be to restore land enough to make it usable again for crops or livestock. This might be more difficult to do for heavy metals than petroleum.

What methods exist for safe disposal of heavy metals?

No clue mate. I haven't given this business idea enough thought to be honest.

Fair enough. I'm just curious.

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