Yes, block chain is bad for environment because this is take very high electricity and so many country not make hi electric. so this is not good for environments and people.
Not blockchain. Bitcoin.
You can operate a blockchain without any mining power needed if you would want to. It's simply a ledger that isn't distributed by a central system, but rather peer 2 peer. Look at
I would however conclude that the bitcoin mining process is pretty wasteful. With most miners located in china (where clean energy is a word they don't know.)
This is from 2012
That's not going to be good for the environment.