I'm not that certain that many people would take up on that, the data so far has pointed towards cryptocurrency as NOT being environmentally friendly due to mining. At least, this is one of the main arguments I get trying to explain the benefits of digital currency over fiat.

Indeed, crypto is a new technological breakthrough and the after effect caused from its mining in the larger scheme of things and in comparison to other activities like deforestation and oil rigs it is not a 'great' threat to the environment unlike the former methods but it is one nonetheless.

 However, when looking at a problem like this I believe one should always consider the pros and cons, and it is my opinion that crypto's benefits far outweigh the 'eco' related issue - one which can even be solved with more technology like hydrogen fuel, hydro powers, solar cells etc. All we need is technology!