I think it's a mistake to single out crypto as a unique actor in this growing issue, and that we should look for solutions that will generalize across all industries. Because all industries are contributing to the modern ecological crisis.
And I'll add, crypto does not care if energy becomes more scarce. What crypto cares about is that energy is equally scarce for attackers and defenders. If, due to regulation of production, the cost of energy goes up, crypto will use proportionally less energy and keep chugging away quite happily.