The problem with Bitcoin is that energy waste is inherent in its design. As Bitcoin value goes up, the value of a Bitcoin relative to energy changes, which encourages more mining, which results in higher energy spend and emissions as the algorithm difficulty adjusts to the new hash rate.
Generating 10,000,000 bitcoins could be done at low energy with a few miners - but the more valuable they become the more energy they use.
My issue with Bitcoin is that while other industries try to save power, Bitcoin tries to waste it and waste is built into the algorithm.
And the more popular Bitcoin gets, the more our planet gets polluted trying to make magic numbers on a ledger.