We as an association have been reporting member company GHG emissions for over a decade, and on a site basis too, not just an aggregate basis. We also have, as part of Towards Sustainable Mining, a specific performance indicator dealing with greenhouse gas management, and members report on that. It is subject, as I mentioned earlier, to external verification as well. So there are some definite drivers within the industry.
I would say that the larger facilities do better than the smaller ones. Energy is a huge input cost for the industry. So for smelters, we've seen an overall net reduction—not just on a per unit basis, but an actual total net reduction—in greenhouse gases from our smelters over the past, say, 15 years.