I took this photo somewhere in the Bighorn Mountains a few years ago.

To celebrate Earth Day, the Foundation for Economic Education posted these articles, which anyone who cares about the environment should consider reading:
Articles

• “Controlling Pollution,” by Hans Sennholz
• “Saving the Environment for a Profit,” Victorian-Style, by Pierre Desrochers
• “Chemical Hysteria and Environmental Politics,” by Doug Bandow
• “Thank You, Internal-Combustion Engine, for Cleaning up the Environment,” by Dwight Lee
• “Freedom is the Environment’s Best Friend,” by John Semmens
• “The Impossibility of Harming the Environment,” by Roy E. Cordato
• “Government Versus the Environment,” by Russell Madden
• “Economic Notions: The Perverse Popularity of Command and Control,” by Dwight Lee
• “Is Greed Green?” by Pierre Desrochers

Audio

• The Fable of Environmental Apocalypse, Doug Bandow
• Global Warming and Environmental Issues, Gene Callahan

(Hat tip to FEE)