We waste enough energy using blockchain for crypto to run a country. It is ridiculous.
If you decide to go down the bitcoin rabbit hole you learn that bitcoin is using waste energy in the form of methane (that would be otherwise let into the atmosphere) from oil flaring is being used to mine bitcoin. It’s early technology but it’s being applied today. Wait till nation states get wind of this.
Remember energy is neither created or destroyed
If you’re interested here’s a link
Natural gas venting: How Bitcoin solved a 160 year old problem