(www.estec.esa.nl/mercure/unep/nat_res2.htm)

Desertification is a growing problem in our modern day world and something must be done to stop it from spreading. One of the major causes of dersitification is excessive animal grazing on certain areas, which, in return, makes soil infertile. Read on for more information on this growing problem.

(www.esa.int/esaEO/SEMIRD3VQUD_environment_1.html)