See this nice video : Google Alert – desertification
http://www.youtube.com/watch?v=a49FRUxLSrg
Brazil: Desertification
United Nations, February 2011 – It’s a phenomenon unknown to many, yet it threatens almost half of the world’s land. It’s called desertification and if left unchecked, its effects are disastrous. But in the drylands of Brazil, new hope is emerging and capturing the world’s attention.
Script (pdf): http://www.un.org/webcast/pdfs/21century52.pdf
21st Century Episode 52