Bitcoin is not a protocol for honest people to reach spontaneous agreements. It uses algorithms to create consensuses, and audit might be powerless in this system.
A government strong enough might have the ability to control Bitcoin mining over the holders, but breaking decentralization in this way will kill Bitcoin in its fundamental, and it seems that no such government is going to do this for now, especially when the reason is "environmental problems", which is generally not in high priority. Beside this idea, maybe a BIP (Bitcoin Improvement Proposal) is the best way of achieving consensus, but I can't imagine such a proposal being approved based on its limited feasibility.