1. bitcoin has created a market where people purchase security of their assets with the ultimate currency - energy. that market isn't going anywhere, the idea is out of the bag and you can't un-discover it.
2. energy consumption is not what causes carbon emissions, energy production does. stop chasing consumers and start regulating producers if you're honest about being so very concerned about environment.
3. it's not your business what i do with the energy that i buy at market rates.