I'll just be very quick. I know that Brenda wants to make a comment as well.
I wanted to come back to your last point, about relying on environmental groups and others to do this. We work very closely with academia, research institutions, environmental groups, but I would also highlight the fact that the companies that are appearing here today also have on their staff many environmental specialists. In fact we have far more of those kinds of people than we used to because of the focus on this area.
So there is a lot of expertise in the environmental area within all of the operating companies as well.