Lets say you burn it to generate power, as a lot of refuse is in Sweden. That's substituting for fossil fuels. Is it better to burn oil out of the ground, or carbon extracted from the atmosphere? You're creating a more sustainable cycle.

As a material, if you're using it in place of plastics again it forms a more sustainable cycle over a reasonably long time frame.

Yes we do need to sequester some atmospheric carbon long term, but establishing a more sustainable carbon materials cycle has an important role to play.