According to IPCC (2007), factors such as endemic poverty, bureaucracy, lack of physical and financial capital, frequent social unrest and ecosystem degradation significantly reinforce Africa’s vulnerability to climate variability. Thus, a clear assessment of the effects of climate variability in a semi-arid zone is a handy policy tool. Although most African countries rely on
agriculture to foster their economic growth (Barrios, Bazoumana and Strobl, 2008), the share of the sector in relation to GDP (gross domestic product) varies across countries.