If I may add one thing about GHG production, it is not only coming from the energy intensity, but it's also coming from the vapours that are released from solvents being used to mobilize the oil. Some of these solvents are equivalent to 21 times the carbon dioxide, so a small amount of them produces 21 times more carbon dioxide. That's another thing worth paying attention to. Reducing these amounts will mean the GHG impact will be less.
On October 19th, 2006. See this statement in context.