Well, upgrading remains an important part of our total process.
I would like to say that we have set environmental goals for our company over a six-year period. We have goals right now on energy intensity, to address the very questions you're talking about. We're in the process of setting new long-term goals for our company around GHG emissions and other important areas around the environment and social issues. We believe that it's very important to set performance improvement goals so that we're continually improving our performance. We see it in energy efficiency, but also in step-change places, where we can change technologies.