Well, in this world where people actually care about the planet - you can't say this is any good...
https://edition.cnn.com/2019/06/14/tech/bitcoin-carbon-footprint-trnd/index.html Bitcoin is definitely spewing out WAY TOO much carbon dioxide and is going to kill us all. Can't fix it either because the entire notion of blockchain requires competitive mining. It is only going to get much worse as Bitcoin value increases. Total ruin.
I really think this is the death knell for Bitcoin.
Lol! Mints worldwide are emitting way more electricity that bitcoin consumes. Why should we need physical money after all? If these is your perspective of bitcoin mining, then you should start with mints worldwide. Carbon emission is indeed a challenge which world leaders need to address at some point of time! But targetting Bitcoin mining for that, is not going to help at all!
On the flipside, it is much easier for miners to switch from conventional energy source to alternative source! But it is not possible for big factories to rely on alternate source due to their high consumption!
BTW, do you think thermal power generation process does any less harm to the nature??