If you compare Bitcoin's environmental footprint to the whole financial system with air cooled offices around the world, with equipment, server rooms it doesn't come close.
A positive side of Bitcoin mining is that it's geographically independent and it can move to where they have too much energy which cannot be stored. In some cases the abundance of energy would be wasted through gas flaring which puts more CO2 into the atmosphere. Now they can get rid of their excessive energy and store it in the form of Bitcoin.
* https://thefactsource.com/how-much-electricity-does-youtube-... * https://research.arcane.no/news/equinor-partners-with-bitcoi...