I hinted at that I've been kicking around a "Proof of Forestry" idea for a while, which replaces traditional "mining" with a potentially carbon emissions *reducing* approach (well, in theory). I posted a sketch of that idea to the cap-talk mailing list just now: groups.google.com/g/cap-talk/c

It's just a sketch and I'm not suggesting "go do this", and the real challenge here is *governance*, not tech. But maybe it upends some assumptions of what essential properties of a "cryptocurrency" are?

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@cwebber I think people at greenstand.org have similar ideas and are thinking about where this could lead (they don't use blockchain today but are considering it when feasible):

greenstand.org/treetracker/faq

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