Christmas lights use way more electricity per year than Bitcoin mining. 6.6 billion kw/h for Christmas lights, 33 million Christmas trees grown and shipped around.
Issue is that any other thing becomes more and more efficient with time. Crypto pow will eat literally any sized cake and waste it.
We could invent fusion and crypto would eat that too.
But bitcoin uses more than 80 billion.
highway speed limit is 90kmkgWlboz/(hkgWlboz).