Today is Earth Day. Protecting and improving the environment is a big thing for me; in fact, it is one of the many reasons I love free markets. One of the major champions of free market environmentalism is the Property and Environment Research Center (PERC) located in Bozeman, Montana. I highly recommend checking out their blog and publications.
In the interest of full disclosure, I have no financial ties to PERC, but there are academic ties. One of my professors, Thomas Stratmann, is a senior fellow.