Interested in Environmental Economics? You may want to check out:
The Association of Environmental and Resource Economists
EPA's National Center for Environmental Economics
The European Association of Environmental and Resource Economists
Blogs related to Environmental Economics:
Economists on Environmental and Natural Resources: News, Opinion and Analysis (Tim Haab and John Whitehead)
An Economic View of the Environment (Rob Stavins)
Environmental and Urban Economics (Matt Khan)
Random Observations for Students of Economics (Greg Mankiw)
Real Climate Economics (including Jim Boyce from UMass Amherst)
Market Forces (Nat Keohane and Gernot Wagner)