Do you remember Black Mirror 1x02 episode, "15 Million Merits"?
I've never been a fan of it, but this is not what I wanted to talk about.
I don't want to talk about all the part about invasive ads and the reality show either.
My point is: what do you think about the process of mining by riding an exercise bike? By generating energy instead of spending it?
The concept might be extended as well to other clean energy production systems like solar panels for example.
For every clean watt generated, you get 1 unit of a crypto coin.
Nature would thank for sure!