It is not just that they [illegal immigrants] degrade the lands they physically cross, it is that people whose main concern is economic survival are not likely to be concerned about environmental protection. They are unlikely to become Sierra Club members or to make contributions to the Nature Conservancy. Love of nature comes more easily to middle class white collar workers for whom nature is a scene of recreation than for those who must wrest a livelihood from it by hard toil.
Vallicella, B. (2014). On Legal and Illegal Immigration. Maverick Philosopher. Available http://maverickphilosopher.typepad.com/maverick_philosopher/2014/09/on-legal-and-illegal-immigration.html. Last accessed 27th Mar 2015.