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Large-scale irrigation infrastructure projects are back on the development agenda in sub-Saharan Africa after a near 30-year hiatus, despite projects having had disappointing results, with social and environmental side effects outweighing benefits. Such projects are planned in response to water scarcity pressures and are seen as a solution to intensify agricultural production, support rural economic development and enhance resilience to climate change.

"It is now possible to trace the migratory paths of anatomically modern humans using genetic data. Early research pointed to a sub-Saharan African origin for modern humans by around 200,000-150,000 years ago1, and analyses of autosomal markers2 and Y DNA haplogroups3, 4 suggest the earliest structuring of the human population occurred approximately 140,000 years ago5,6,7,8. Initial efforts to characterize the movement of early humans in relation to ancestry grouped populations according to five geographical regions: Sub-Saharan Africa, Europe/the Middle East/Central Asia/South Asia, East Asia, Oceania, and the Americas9. Subsequent analyses allowed for refinement of the genetic history of global ancestries, revealing regional structure through the identification of 710, 1411, and 19 ancestries2."