Greenness in semi-arid areas across the globe 1981-2007: an Earth Observing Satellite based analysis of trends and drivers

Rasmus Fensholt, Tobias Langanke, Kjeld Rasmussen, Anette Reenberg, Stephen Prince, Compton Tucker, Robert J . Scholes, Quang Bao Le, Alberte Bondeau, Ron Eastman, Howard Epstein, Andrea E. Gaughan, Ulf Hellden, Cheikh Mbow, Lennart Olsson, Jose Paruelo, Christian Schweitzer, Jonathan Seaquist, Konrad Wessels