Ethereum 2.0 solves this via Proof of Stake. They are rolling it out in 2021 and I think the environmentally concerned will then consider the number two coin be

Ethereum 2.0 solves this via Proof of Stake. They are rolling it out in 2021 and I think the environmentally concerned will then consider the number two coin because of how energy hungry Bitcoin is. PoS also greatly increases transaction speed.