"Properly managed, rangelands can be maintained at high levels of production in perpetuity. Rangelands are managed with ecological principles, unlike cropland, which is managed with agronomic principles. Proper management of rangelands requires an understanding of the effects environmental forces have on plant growth and of the complex processes within the plants and ecosystems...Management that places the biological requirements of the plants as the highest priority and facilitates the operation of ecosystem functions at potential levels will sustain healthy, productive rangelands that will remain a valuable renewable natural resource, providing forage for livestock, habitat for wildlife and plants, clean air, clean water, open spaces for recreation and sightseeing, and food, fiber, and energy for people.
-Manske, Llewellyn L. (2003) "Biologically effective management of grazinglands." http://www.grazinghandbook.com/bin/Biologically%20Effective%20Mgt%20of%20Grazinglands.pdf