I think this is in some ways going right to the heart of the issue of the convergence of energy and environmental standards. We are short of developing the technology to the point where it can be deployed on a commercial basis. But as with all major technologies that offer the prospect of a step change, we are past the proof-of-concept stage as well. So it is much more than good theory, but it is not yet at the stage where we can develop.
One of the world's largest facilities is actually putting pure CO2 into the ground in underground caverns at Weyburn, Saskatchewan. It is bringing in CO2 from the northern tier of the United States. It is being used currently in the area of enhanced oil recovery. I would describe storing carbon in the oil sands as still under development, but it is more than a theory.