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Or fracking that makes us drink contaminated water.

But the HN community wants something like "Proof of planting a tree" or something like that...

Take a look at "Proof of Space" and "Proof of Time" by https://chia.network/

Can you link to anyone at all on Hacker News claiming that cryptocurrencies should be based on proof of planting a tree, or were you making a strawman argument?

There were a few green proof-of-delivering-marijuana start-ups, but I can't remember any green proof-of-planting-a-tree ones.

Proof of Time is actually Proof of Intel (or any other company providing the trusted hardware).

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