http://www.un.org/ecosocdev/geninfo/sustdev/changing.htmScroll down to where it says, "'Green' Pricing".
Excerpt:
"One method is to charge different tax rates on environmental "goods" and "bads". In Sweden, lower taxes on unleaded petrol encouraged drivers to stop using leaded fuel. Some countries have begun to charge for natural resources. Perhaps, the best known of these "user-pays" fees are water charges. Meters are installed in each home and the occupier pays for the water. Since consumption is directly linked to cost, it is hoped that those paying will use less. Some Governments are taking special action to avoid placing an extra burden on the poor, who will spend a larger percentage of their income on user fees than wealthier people. Measures sometimes include providing an initial free allocation before the charges kick in and giving a rebate on personal income tax.
In an effort to discourage polluting behaviour, some countries charge people who pollute -- whether drivers of private motor cars or big industrialists -- the "full" environmental and social costs of their activities. Provided the "polluter-pays" charge is high enough and the polluter has alternatives available, the polluting activity is likely to be stopped."
It's from June, 1997, but it's something. Good luck! :hi: