Most of the freshwater in the United States is found in lakes. Most American cities now subject their wastewater to desalination. In the United States, most freshwater is used in homes. Solar-hydrogen energy produces radioactive wastes. It is a primary source of air pollution.
Coal mining causes saltwater intrusion into aquifers.
Burning coal produces radioactive wastes. The major cause of desertification in Africa is strip mining. overlogging. Chlorofluorocarbons are used in refrigerators, air conditioners, and the manufacture of plastic foams. It may lead to changes in the sea level. It increases the amount of ultra-violet radiation that reaches the earth's surface.