The Impact of Climate Extremes on Dryland Ecosystems and Societies in Sub-Saharan Africa

Diplôme Thèse The Impact of Climate Extremes on Dryland Ecosystems and Societies in Sub-Saharan Africa eng 2023 2023 author Kitasho Neema Maburre 930909 director Di Falco Salvatore 788423 Recherche et enseignement GSEM (RESEM) director Stoffel Markus 131626 Forel Communs (FOREL) 10.13097/archive-ouverte/unige:174046 urn:nbn:ch:unige-1740461 Sc. 5776 <p>Over the past sixty years, land productivity in Africa has steadily declined, primarily due to climatic constraints that limit its full potential. With three-quarters of Africa's landmass being drylands spread across 46 out of 54 countries, the region is highly sensitive to climate and environmental challenges. This has led to severe and recurring climate extreme events, disproportionately affecting the livelihoods of the population, especially the poor. However, limited research and evidence exist on the magnitude of climate change outcomes and their impact on ecosystems, agriculture, and food production, as well as the response of individual households to these extreme events. The principle objective of this PhD thesis was to enhance our understanding of the impact of climate extremes on dryland ecosystems and society in sub-Saharan Africa (SSA), comprehensively examining various levels of impact. To achieve this, several methods were applied. First, by conducting a systematic scoping review at the continental scale, we compiled existing knowledge and identified gaps regarding trends and impacts of droughts in SSA. Next, an investigation was done on the influence of natural volcanic forcing and internal climate variability on one of the most extreme droughts that occurred during the 20th century in SSA; this analysis of the climatic impacts following the Mount Pinatubo eruption in 1991 also included identification of implications of this to geoengineering solutions of global warming. We then assessed the spatio-temporal characteristics of droughts in Tanzania, with a specific focus on examining their distribution and patterns over time. Lastly, by utilizing household panel survey data in Tanzania, I estimated the influence of climate extreme shocks on the decision of households among agro-pastoral communities to cope with droughts and heat and how market accessibility would facilitate. </p> <p>The key findings of this study were: 1) extreme climate events such as droughts and heatwaves are intensifying over SSA and there is a demand for more empirical research on the continent especially to the underrepresented blocks such as central Africa, 2) stratospheric volcanic induced aerosols exacerbate droughts in SSA, implicating extreme caution for geoengineering solutions, 3) droughts have been significantly increasing in Tanzania over the past 61 years and the dry seasons are becoming drier while crop growing seasons have been impacted severely. This poses a major challenge to rain-fed agricultural schemes. Finally, 4) decisions of rural households to adapt to climate extremes rely on market accessibility as food consumption becomes constrained. All these findings have policy implication that, specificity will always remain to inform the details and therefore caution should be exercised in devising and implementing solutions to the climate crisis at any level, including solar radiation management to reduce warming.</p> Climate Extremes Dryland Ecosystems Societies Sub Saharan Africa Dewey 550 29 Section des sciences de la Terre et de l'Environnement 15 false a1812e32-30a6-423a-8dc1-ca7275a4de9a Thesis Public KITASHO_Manuscript.pdf 13585009 application/pdf Private 2026-01-01 ea48ea273b45df9998b9e752e116eca57cdd1d1d4f6e1c49e93606e8753b08e8 5847e26a-9955-4415-a7d3-4f9306771fb1 Imprimatur Public imprimatur_Neema_1-1.pdf 46417 application/pdf ccda12e7bb84de0cc5f67f6483237adc35ea6c15a7b1c85e223b9f96289d5d73 openAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement

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The Impact of Climate Extremes on Dryland Ecosystems and Societies in Sub-Saharan Africa				2023	356	204

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