Enviros may roll their eyes at a candidate who dismisses the U.S. EPA as feckless and disposable, who believes all public lands should be privately owned, and whose remedy for an ailing planet is "a free-market system and a lot less government." But Ron Paul, the quixotic libertarian U.S. rep from Texas, has a cult following online second only to Barack Obama's, and has won unexpected attention in the GOP presidential debates with his provocative ideas. Some of those ideas arguably have environmental merit. Paul is known for his zealous opposition to the Iraq war, which he duly notes causes...