Period. Shutting down Bitcoin won't solve global warming, and Bitcoin doesn't require fossil fuels necessarily to run. This is a tired argument that blames the ills of the world on one thing that you don't particularly like or see the benefit of. Bitcoin just likes abundant, cheap energy just like everything else in our modern world.
Technological societies require increasing amounts of energy. The issue is that fossil fuels are easier to generate electricity out of, favoured by governments, lobbies and voters alike, so renewables are more expensive. If your issue is burning large amounts of fossil fuels, you should work on this problem rather than complaining about one user downstream of the problem. It's easy to point the finger because it's easy to calculate how much energy bitcoin uses (transactions per day * energy per transaction), so it's easy to make a one-line viral tweet blaming all the ills of the world on it, while there are much more wasteful businesses whose energy usage is hard to quantify that everyone conveniently ignores.
It is so tiring to have to explain this every time on every HN thread, but I guess it's always so easy to convince oneself there is a simple solution to very hard problems. "Just shut Bitcoin down, I don't see a use for it so it's useless."