Check out the Jan-Feb 2007 Milken Institute Review "lists" feature (page 96):
There are now literally thousands of blogs with some economic content, and dozens worth an occasional look. I find myself going back to these 10 (listed in no particular order) for a mix of fresh ideas, reality checks and even a bit of uneconomist-like passion.
...
Environmental Economics (www.env-econ.net)
Tim Haab (Ohio State) and John Whitehead (Appalachian State) specialize in natural resources and environment issues....
We can all thank Tim for the passion part ... Thanks Tim!