I know it has been discussed often with many hardliners on both sides about the energy consumption of Bitcoin and its CO2 footprint.
For my opinion as crypto technical forward payment option we should not close the eyes to it when many people try to lower their CO2 footprint to do the same.
This is an old topic but for the sake of the argument i'll leave it here.
Changing the Bitcoin codeSome altcoins have already done this to avoid the race for computing power by miners. This eliminates the need for dedicated high-speed mining equipment.
HardwareASIC miners use less power to generate more coins
Buying carbon creditsIt is designed to underpin renewable energy credits, meaning that when you trade them, youre supporting a market that rewards the production of solar energy.
Buying green powerMost jurisdictions offer ways to purchase power from alternative energy suppliers. Alternatively, you can buy renewable energy certificates or their equivalents, which are tradable certificates rewarding producers of renewable energy.
You can look at it here.