Cryptocurrencies consume a miniscule fraction of the energy that the legacy financial system wastes on office buildings, data centers, air travel and commuting employees.

Why doesn't anyone complain that JPMorgan will "cost us our clean-energy future"?

The great thing about a financial system defined by open-source software is that true innovation happens every day. Already we see testing with proof-of-stake, lightning network, etc. that are vastly more energy efficient.