The massive amount of stranded hydro that Bitcoin was soaking up in China, when mining was banned was that energy magically teleported to NYC to power people's TVs and dry their clothes? No, it's now sitting there unused with no buyers of last resort. In fact, that being sitting unused is now subsidising the fossil fuel mining by lowering the relative mining difficulty.
Mining is responsible for a rounding error in emissions, if it disappeared tomorrow it wouldn't even make a detectable dent.
Fossil fuels are bad. Fossil fuels being used for mining is bad. That doesn't make Bitcoin bad.