Jason D Scorse has an interesting series of posts in Gristmill. In his first post he makes four recommendations for improving the environment - eliminate all natural-resource subsidies, expand property rights in areas where they are weak or non-existent, empower society with information, and enlarge green markets through government purchases. The latter two points involve the active participation of governments and I am afraid would in pratice be so badly implemented that they would harm the environment. I completely agree with the first two proposals and I applaud the rational outlook of Scorse in this and his other posts (by the way, he also posts at Environmental Economics as J.S.).
These are my four ways to improve the environment, using words I wrote before reading Scorse's post:
1. Eliminate all government subsidies to agriculture, fisheries, forestry, mining, transportation, and power generation.
2. Increase the strength and extent of private property rights, especially of wild lands, rivers and sea waters.
3. Eliminate artificial barriers to trade and immigration.
4. Eliminate public policies that favor urban and rural sprawl.