Michelle Chen provides a useful overview of the intertwined environmental and humanitarian disaster of American policies toward the Mexican border. She covers several important issues. To excerpt from her introduction:
The parts of the border that take the form of an actual, physical barrier are an intrusion on the landscape, an eyesore to many — and to millions, a deadly obstacle to overcome. Elements of the local environment, from deserts to the Rio Grande, have been trampled, polluted, criss-crossed by truck convoys, occupied by federal agents and factories, and traversed by migrants following well-worn and perilous trails. And each phase of commercial development and economic exchange has also left an ecological mark, from the bustle of tourists to the churn of the maquilas to the paths trod by migrants following smugglers.
Just as immigrant rights activists see the border as a violent social barrier, environmentalists see the border fence as an assault on the integrity of regional ecologies. The border environs is both a symbol of global environmental changes — transnational movement of people and natural resources, climate change, the wave of urbanization that is sweeping wild lands worldwide — and a symptom of acute environmental impacts — the footprints of stampeding livestock, baking asphalt slicing through desert, and a dense network of dams and pipelines tapping the veins of increasingly parched riparian habitats. In the border zone, life is disrupted by the armature of the state.