I don't believe mining Bitcoin quite falls into the category of "most productive things we can use energy for". Drug discovery, carbon capture, agriculture, con

I don't believe mining Bitcoin quite falls into the category of "most productive things we can use energy for". Drug discovery, carbon capture, agriculture, construction, etc. etc. come to mind as slightly more useful. Financial transactions in traditional banking systems which Bitcoin mining is more comparable with consume far far far less energy. Also Bitcoin is designed to adjust PoW difficulty based on network's average mining performance. In other words, the more compute power you provide the less efficient it becomes.