The environmental impact of "Proof of Work" could have been a problem but the inventors did think about that and realized that mining can be done pretty much anywhere, using renewable resources that would otherwise be untapped. As usual the ethical burden should be on the user of the tool, not the tool itself.
In the long run miners who do not use untapped (cheaper) renewables are going to be priced out, it just takes some time. That said other protocols much less computationally intensive, such as "Proof of Stake", are starting to be tested.
In the long run miners who do not use untapped (cheaper) renewables are going to be priced out, it just takes some time. That said other protocols much less computationally intensive, such as "Proof of Stake", are starting to be tested.
Anyhow, good idea NVIDIA!