With regard to the impact of carbon capture and storage on the potential reduction of water intensity in oil sands development, there are three different types of oil in the ground: there are the oil sands, there's heavy oil, and there are conventional reserves.
This is just stuff I've read, so I'd have to confirm what I'm going to say now, but carbon dioxide has been piloted as a way to improve the recovery of heavy oil and the tertiary recovery of conventional reserves, but it has not been targeted at in situ recovery of the oil sands. So I don't think it will have a role in reducing water intensity in oil sands recovery.