What people miss with this often repeated narrative is that #Bitcoin absolutely does not rely on energy and carbon-intensive digital mining. You could run a serious Bitcoin network on a couple of small solar panels and junked car batteries.
Instead, people choose for themselves to exchange energy for Bitcoin because they see it as more valuable than the energy. They spend more energy than Bitcoin requires because they see it as just that valuable.
So the idea of changing to a cleaner protocol doesn't really offer a solution since it's the people, not the protocol, burning so much carbon.