While most of the discussion about a US/Mexico fence has centered on immigration and urban areas, there's also concern about the potential impact these barriers would have on wildlife. Great photo essay about the most-affected wildlife and natural systems that span the US/Mexico border.
immigration

Security vs. the Environment: Border stops people AND wildlife [pics]
(via www.nature.org)
Submitted by jcolman on Wed, 2007-11-14 17:11. | Tags: politics | animals | border | conservation | ecology | environment | fence | government | homeland security | immigrants | immigration | Mexico | nature conservancy | plants | Politics | science | security | Texas | the nature conservancy | tnc | United States | wildlife