It's obviously good if worldwide miners all agree to protect the environment together. It's also right that many governments have paid a lot of attention to Bitcoin. However, Bitcoin is not to be strictly regulated by design.

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.