http://en.wikipedia.org/wiki/Soil_salination From Wikipedia, the free encyclopedia Visibly salt-affected soils on rangeland in Colorado. Salts dissolved from the soil accumulate at the soil surface and are deposited on the ground and…
http://en.wikipedia.org/wiki/Slash-and-burn From Wikipedia, the free encyclopedia Not to be confused with scorched earth. “Occupational burning” redirects here. It is not to be confused with occupational burnout. Slash-and-burn practices in Eno, Finland, 1893 This…
http://en.wikipedia.org/wiki/Agricultural_revolution From Wikipedia, the free encyclopedia “Agrarian Revolution” redirects here. For the Agrarian Revolution in China between 1927-–1937, see Chinese Civil War. An agricultural revolution or agrarian revolution is a period of transition from…