First of all, before I let Mr. Lunn answer, the fact is that greenhouse gas emissions from oil sands are 4.6% of the total emissions of Canada...and something like 80% of the emissions from a barrel of oil produced and the greenhouse gases at the consumptive end. So our contributions to the impact you're speaking of are actually relatively limited, compared with other users of our product.
So with that, I'll let Mr. Lunn speak to your question.