Southern Arizona Project to Address Public Land Degradation as a Result of Illegal Immigration: 2004 End-of-Year Report [open pdf - 6MB]
"Fiscal Year (FY) 2004 was the second consecutive year funding was specifically provided by Congress 'to address public land degradation as a result of illegal immigration' in Arizona. The Bureau of Land Management (BLM) and all of its partners greatly appreciate this support which was initiated by Congressman Jim Kolbe and supported by the Arizona Congressional Delegation and other members of Congress. [...]. It has been estimated that each immigrant discards at least eight pounds of trash on his/her journey through southern Arizona. On this basis, 1.24 million pounds (620 tons) of trash were left on Federal and Tribal lands in southern Arizona by those arrested in FY2004. This does not take into account the tens of thousands (if not more) of migrants that were not arrested or the previous six years of accumulation. Cutting fences and vandalism by smugglers and illegal immigrants also are problems. Livestock fences are cut and torn out by vehicles. Gates are rammed by vehicles or left open, allowing livestock to escape. And, repairs of this damage are required on a continuing basis and are very costly and time-consuming. Warming and cooking fires by illegal immigrants escape and destroy vegetation and wildlife habitat and cause a safety hazard to visitors--including other illegal immigrants that might be in the area--and firefighters."
United States. Bureau of Land Management: http://www.blm.gov/