Africa-wide "Great Green Wall" to halt Sahara's spread?
28 December 2009
28 December 2009
China built its famous Great Wall to keep out marauders. Now, millennia later, a "Great Green Wall" may rise in Africa to deter another, equally relentless invader: sand.
The proposed wall of trees would stretch from Senegal to Djibouti as part of a plan to...