We have not actually done that equation. We don't have the resources to go into such depth to do an accurate...well, we've done it with greenhouse gas emissions, and the amount would be a dollar or so. It varies according to what systems you use. We have not done it with water. It was a question of having a financial levy that would be used productively.
For the moment, with the price of oil being what it is, we know there's a very large margin there. Companies at the moment find it more economic simply to reinvest in producing more oil. They get a better return on their money than they do reinvesting in water conservation. I've heard that said by companies.