There are plenty of zksnark based crypto solutions out there that are both private and environmentally friendly. Bitcoin uses a particularly nasty and wasteful

There are plenty of zksnark based crypto solutions out there that are both private and environmentally friendly. Bitcoin uses a particularly nasty and wasteful consensus algorithm that just happened to have first-mover advantage enough to become a major contributor to world carbon emissions. It'll eventually go away and be replaced with one of the alternatives that doesn't require the same energy burn.