Parameter Tree:
EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > DESERTIFICATION

Definition:
The formation of deserts in arid and semi-arid regions from overgrazing, deforestation, poor agricultural practices, and climate change. Evidence of desertification can be found today in Africa, the Middle East, and the southwestern United States.

Reference:
Chiras, Daniel D. 1998. Environmental Science. A Systems Approach to Sustainable Development. Wadsworth Publishing Company. Belmont, California.