We have done both calculations. There are some standards, such as ISO 14064, which Alcan has worked on, which establish benchmarks and standards to guide our GHG reduction audits. We do two calculations. First of all, we do the intensity-based calculation, which is important because it is a mark of continuous improvement. You become the benchmark in the industry.
For example, if we were to become the international benchmark for the aluminum industry, the International Primary Aluminum Institute has calculated that if the industry were to apply the average best practices of all aluminum smelters in the world, by 2017 the aluminum industry would be neutral in terms of carbon emissions. So that means we have to raise the rest of the world up to the same level of operational excellence. We do our calculation on the basis of current levels, which do not cost any more because we use a formula. So when we issue our figures, we issue both sets of figures at the same time. If you end up with a cap and trade carbon exchange, you won't be selling intensity but absolute levels.
Alcan went to the United Kingdom, France and other countries to sell absolute credits. However, in Canada an intensity-based approach makes it possible for us to continue improving emissions per pound, per kilo and per tonne of aluminum produced in our system. So we do both at the same time.