Since the mid-1980s, the positive impacts of these simple, cost-efficient water harvesting techniques become clear, following their increasingly widespread adoption. Their use has allowed smallholders to reverse land degradation, improve soil fertility, sustainably increase crop production, achieve food security, and create more productive, diverse and resilient farming systems. At the same time, groundwater is recharged, improving access to drinking water for the entire year, and creating opportunities for irrigated vegetable gardening around wells.

The West African Sahel is very vulnerable to the effects of climate change, due to land degradation, dependence on rainfed farming, political instability, poor governance, food insecurity, terrorism, poor infrastructure, and limited technical capacity. This has particular impacts on the agricultural sector (Sissoko et al. 2011; Zougmoré et al. 2016).

Unless countries can manage to mobilize millions of land users to invest their scarce resources in protecting regenerating trees, the battle against land degradation cannot be won. These experiences from Niger show that hundreds of thousands of smallholder farm families have substantially increased tree cover on their farm land by investing in the management of on-farm trees. This has improved their production systems and their livelihoods. There is no reason to believe that similar success cannot be achieved in many more countries throughout African drylands and sub-humid area.