Environmental threats to shelter, livelihoods, and food security are often considered push factors for intra-African human migration. Research in this field is often fragmented into a myriad of case studies on specific subregions or events, thus preventing a more comprehensive understanding of the phenomenon. This paper examines environmental drivers reported in the literature as push factors for human displacement across 32 sub-Saharan African countries between 1990 and 2021. Extensive consultation of past studies and reports with analytical methods shows that environmental migration is complex and influenced by multiple direct and indirect factors. Non-environmental drivers compound the effects of environmental change.

Intra-African environmental migration is a bleak reality. Warming trends, aridification, and the intensification of extreme climate events, combined with underlying non-environmental drivers, may set millions of people on the move. Despite previous studies and meta-analyses on environmental migration within sub-Saharan Africa (SSA), conclusive empirical evidence of the relationship between environmental change and migration is still missing. Here we draw on 87 case studies published in the scholarly literature (from fields ranging from the environmental sciences to development economics and migration research) or documented by research databases, reports, and international disaster datasets to develop a meta-analysis investigating the relationship between environmental changes and migration across SSA. A combination of quantitative, Qualitative Comparative Analyses (QCA), and statistical correlation methods are used to analyze the metadata and investigate the complex web of environmental drivers of environmental migration in SSA while highlighting subregional differences in the predominant environmental forcing. We develop a new conceptual framework for investigating the cascading flow of interdependences among environmental change drivers of human displacement while reconstructing the main migration patterns across SSA. We also present new insights into the way non-environmental factors are exposing communities in SSA to high vulnerability and reduced resilience to environmental change.

Human displacement in sub-Saharan Africa is often associated with the effects of climate change and environmental degradation.