Banks, Leo. “Border Fence Benefits the Environment.” The Daily Caller. http://dailycaller.com/ 2010/10/04/border-fence-benefits-the-environment/ (accessed February 15, 2012).
This source is about, as the title suggests, how a fence along the border will benefit the environment of the Sonoran desert located within Organ Pipe Cactus National Monument. He goes on to state that this will in no way completely heal the environment, but it’s a start, and every little bit helps.
National Border, National Park: A History of Organ Pipe Cactus National Monument 