Depends on what you mean by "PoS". If you mean "proof of stake" - I've never heard anyone describe any environmental issues with them, so I assume that they ei

Depends on what you mean by "PoS". If you mean "proof of stake" - I've never heard anyone describe any environmental issues with them, so I assume that they either don't exist or are far smaller in impact than PoW. If you mean "proof of storage/space" - it seems like that tends to produce very high write volumes, which in turn burns SSDs out very quickly[1] - and you can argue that that's bad for the environment. How bad, and whether it's worse than the energy consumption of PoW, I'm not sure. From one perspective, it's worse, because you could theoretically power PoW mining using exclusively green energy, but you can't pull the raw materials for SSDs out of thin air. [1] https://news.ycombinator.com/item?id=27001848 https://news.ycombinator.com/item?id=27001848