Working document presented at the International Workshop on the Cost of Inaction and Investment Opportunities in Dry, Arid, Semi-arid and Subhumid Areas, Comité scientifique français de la désertification, Rome, December.
Working document presented at the International Workshop on the Cost of Inaction and Investment Opportunities in Dry, Arid, Semi-arid and Subhumid Areas, Comité scientifique français de la désertification, Rome, December.