Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water. These...

The official website for Union of Concerned Scientists provides information on environmental issues and suggestions on actions people can take to curb environmental harm.

Guardian correspondent Rory Carroll discusses the struggles of the indigenous tribes of the Amazon against Peruvian security forces. (July 4, 2009)