http://www.youtube.com/watch?v=w9RxnuBiFbg

In Senegal, the Acacia project has involved the planting and managing of Acacia forests in arid lands helping combat desertification while providing life-changing benefits to local communities. With two thirds of the African continent now classified as desert or drylands and desertification affecting a quarter of the world's population, the breakthrough has the potential to transform the lives of vulnerable populations

http://www.youtube.com/watch?v=5LJRrDAPuWA