Several environmental changes have occurred in the Sudan in the past; several are ongoing; and others are projected to happen in the future. The Sudan has witnessed increases in temperature, floods, rainfall variability, and concurrent droughts. In a country where agriculture, which is mainly rainfed, is a major contributor to gross domestic product, foreign exchange earnings, and livelihoods, these changes are especially important, requiring measurement and analysis of their impact. This study not only analyzes the economy-wide impacts of climate change, but also consults national policy plans, strategies, and environmental assessments to identify interventions which may mitigate the effects. We feed climate forcing, water demand, and macro-socioeconomic trends into a modelling suite that includes models for global hydrology, river basin management, water stress, and crop growth, all connected to the International Model for Policy Analysis of Agricultural Commodities and Trade (IMPACT). The outcomes of this part of the modeling suite are annual crop yields and global food prices under various climate change scenarios until 2050. The effects of such changes on production, consumption, macroeconomic indicators, and income distribution are assessed using a single country dynamic Computable General Equilibrium (CGE) model for the Sudan. Additionally, we introduce yield variability into the CGE model based on stochastic projections of crop yields until 2050. The results of the model simulations reveal that, while the projected mean climate changes bring some good news for the Sudan, extreme negative variability costs the Sudan cumulatively between 2018 and 2050 US$ 109.5 billion in total absorption and US$ 105.5 billion in GDP relative to a historical mean climate scenario without climate change.

Extreme Hydrology and Climate Variability: Monitoring, Modelling, Adaptation and Mitigation is a compilation of contributions by experts from around the world who discuss extreme hydrology topics, from monitoring, to modeling and management. With extreme climatic and hydrologic events becoming so frequent, this book is a critical source, adding knowledge to the science of extreme hydrology. Topics covered include hydrometeorology monitoring, climate variability and trends, hydrological variability and trends, landscape dynamics, droughts, flood processes, and extreme events management, adaptation and mitigation. Each of the book's chapters provide background and theoretical foundations followed by approaches used and results of the applied studies. This book will be highly used by water resource managers and extreme event researchers who are interested in understanding the processes and teleconnectivity of large-scale climate dynamics and extreme events, predictability, simulation and intervention measures. Presents datasets used and methods followed to support the findings included, allowing readers to follow these steps in their own research Provides variable methodological approaches, thus giving the reader multiple hydrological modeling information to use in their work Includes a variety of case studies, thus making the context of the book relatable to everyday working situations for those studying extreme hydrology Discusses extreme event management, including adaption and mitigation

Abstract: This paper uses the Ricardian approach to examine how farmers in 11 countries in Africa have adapted to existing climatic conditions. It then estimates the effects of predicted changes in climate while accounting for whatever farmer adaptation might occur. This study differs from earlier ones by using farmers' own perceptions of the value of their land. Previous research, by contrast, has relied on either observed sale prices or net revenues, sometimes aggregated over geographically large tracts of terrain. The study also makes use of high resolution data describing soil quality and runoff. Furthermore, it tackles the challenges involved in modeling the effect of climate on agriculture in a study that includes countries in the northern and southern hemispheres, as well as the tropics. The study confirms that African agriculture is particularly vulnerable to climate change. Even with perfect adaptation, regional climate change by 2050 is predicted to entail production losses of 19.9 percent for Burkina Faso and 30.5 percent for Niger. By contrast, countries such as Ethiopia and South Africa are hardly affected at all, suffering productivity losses of only 1.3 percent and 3 percent, respectively. The study also confirms the importance of water supplies as measured by runoff, which, being affected by both temperature and precipitation, may itself be highly sensitive to climate change.

This book explores the impacts of climate change on Nigeria. How climate change impacts the productivity and future development of different sectors in Nigeria was covered in this book. Various themes of the Nigerian economy, environment, and climate change were considered. Worthy of note are the impacts of climate change on the Nigerian air quality, surface and groundwater resources, watershed and natural resources’ development and planning, soil- quality, fertility, salinization, nutrients and cropping patterns. Also, the impact of climate change on land use/land cover, urbanization and strategic planning, crops and sustainable crop yield; land degradation, soil erosion, landslides and landscapes, rainfall trend patterns, drought vulnerability; ecology, vegetation/forest, carbon and biomass management of Nigeria were investigated. Finally, the problems of climate change in semi-arid and arid regions (with special emphasis on Nigeria) and possible solutions for sustainable development under the changing climate were discussed in this book. Advanced technologies, such as remote sensing, GIS, multivariate analytical tools, and machine learning techniques, were utilized in the exploration and analysis of the themes of this book. Thus, this book is a very important product for point of view researchers, scientists, NGOs, and university communities on the Nigerian climate change. This book is a useful interdisciplinary tool, cutting across various disciplines such as earth sciences, hydrology, environmental sciences, soil science, engineering, remote sensing, natural resources management, and public health management, etc.

The paper reviews the performance of the Sudanese agricultural sector over the last three decades (1990 through 2021) and examines the drivers of that performance. Key findings show that the sector’s contribution to gross domestic product was greater during the 1990–1999 period than during the other two decades; agricultural productivity as well was higher in that decade than in the subsequent two decades. The sector has remained a major source of employment and livelihood. During the last decade reviewed (2010–2021), the sector regained its leading position as a generator of foreign currency. Public investment in agriculture and government spending allocated to the sector were lower than in other countries in the region. Political elites have generally lacked commitment to development plans in the sector. Political developments in Sudan have disrupted more recent efforts to revitalize the sector. Climate change, as manifested in rising temperature, declining rainfall, and drought, is a substantial determinant currently affecting the sector. The paper discusses some broad recommendations for improving the performance of the Sudanese agricultural sector.

The rural poor, who are the most vulnerable, are likely to be disproportionately affected.

The Ethiopian economy relies predominantly on rainfed agriculture for income generation, export earnings, and rural livelihoods. However, the frequency and intensity of extreme ago-climatic events projected by climate scenarios suggest considerable and growing risks from climate change to the country’s agri-food systems and the overall economy. This study assesses the economic impacts of recurrent climate shocks on the Ethiopian economy to 2040. The results indicate that recurrent climate shocks will lead to a reduction in Ethiopia's cumulative GDP from 2020 to 2040 compared to a “no climate change” baseline. Specifically, extreme weather events could cumulatively cost Ethiopia up to 17 percent (or US$ 534.3 billion) in GDP between 2020 and 2040 compared to a no-climate change baseline. The weight of the economic loss is concentrated in the agricultural production sector, with rural households and poorer households in urban areas being worst affected. Strategic investments in irrigation infrastructure and in hydroelectricity generation are found to be effective in mitigating some of the damage caused by recurrent climate variability.