Demands for water, energy, and food are rapidly increasing in many low- and middle-income countries, driving the development of large-scale hydropower and irrigation projects. As climate change poses major risks and uncertainties for large-scale infrastructure investments, it is essential to stress-test infrastructure development plans to address these challenges and strengthen resilience. The Nile is one of the world’s longest rivers, draining approximately 10% of Africa’s land surface; Sudan accounts for around 40% of the basin area, where several new large hydropower and irrigation infrastructure projects are planned. We develop an integrated analytical framework for the Nile River system, utilizing 16 climate projections from the Coupled Model Intercomparison Project (CMIP) 6, along with hydrological, river system, and Computable General Equilibrium models to evaluate the biophysical and economic impacts of hydropower and irrigation development in Sudan under climate change. The results indicate a projected increase in the naturalized streamflow of the Nile by 2050 due to climate change. A phased hydropower and irrigation development strategy in Sudan – targeting a total of 1,500 MW of hydropower capacity and approximately one million hectares of irrigated wheat – is projected to increase annual hydropower generation by up to 8.1 TWh and expand total wheat area by 283% by 2050. These developments increase the undiscounted national Gross Domestic Product (GDP) during 2030–2050 by US$ 0.1 to 0.4 billion per year, with larger increases occurring under high economic growth pathways. This research highlights the interconnected nature of climate change, water resource development, and economic performance, underscoring the importance of integrated assessment in informing investment decisions.

The growth of dry season farming in Ghana is putting increased pressure on groundwater resources. Using mixed methods this paper examines the learning effect of an experiential groundwater resource game in Ghana's Upper East Region that simulates real-life resource use and common-pool resource management dilemmas. Results indicate short and medium-term learnings associated with participation in the game. During the game, group interaction and communication improved cooperation and led to more sustainable game behaviours. The gender-specific analysis indicates that females and males may learn and respond differently to the game. Males exhibited more sustainable game behaviours with increased communication and rules whereas female groups showed more learning from round to round. The positive learning effects from the game persisted 12 months after the intervention. Debriefing and focus group participants mentioned lessons learned about the depletable and shared nature of groundwater resources and the importance of communication and collective governance. Participants also described selecting water conserving crops and creating community watering schedules to manage water use. Findings highlight the important role experiential learning games can play in increasing knowledge, motivation, and agency associated with sustainable natural resource use.

Abstract Irrigation is widely recognized as a promising strategy for enhancing agricultural productivity in Sub‐Saharan Africa. To support its expansion, solar‐powered irrigation systems are increasingly promoted as a sustainable alternative. However, unlike fossil fuel‐based systems, the performance of solar irrigation is more sensitive to climate variability and change. This study assesses the impact of climate change on the cost and cost efficiency of stand‐alone solar irrigation systems across Sub‐Saharan Africa, using 15 CMIP6 climate scenarios. Our findings indicate that climate change is likely to increase investment costs and reduce the cost efficiency of solar irrigation systems compared to diesel‐powered alternatives in most countries and agricultural areas of the region. Nevertheless, the expected decline in cost performance of solar irrigation systems is moderate and is likely to be offset by continued reductions in solar panel prices.

Within the food-energy-water nexus framework, energy choices in both agriculture and household domains are connected, and affect water access, agricultural production, household consumption patterns, and ultimately food security. This study examines dual energy portfolios among farming households in Rahim Yar Khan district, in Punjab, Pakistan. Using cross-sectional data from 1018 households, we analyze how the distinct but interconnected energy domains on-farm and at-home, relate to household wealth and location, and follow fundamentally different transition trajectories. We find that a majority of households use mechanization on farms, including the use of irrigation pumps, threshers and tractors. Mechanization increases with household wealth and farm size, confirming the energy ladder hypothesis. However, for the same households, domestic clean energy access remains limited across all wealth categories and farm sizes, with only 6% using clean cooking and heating energy. The findings reveal that agricultural and domestic energy transitions are proceeding at different paces among the same households, with implications for integrated energy policy. Our study highlights the need for policies that address both agricultural and domestic energy needs simultaneously while considering the trade-offs and synergies between these domains within household resource constraints.

Global water crises are, finally, near the top of the agendas at the United Nations and at multilateral initiatives and organizations. A social sciences– and humanities-informed emerging literature that we call Heterodox Thinking offers alternatives to much of the current decision-making on water. Rooted in water economics, values, and governance, Heterodox Thinking comprises developments in nonmarket valuation, systems thinking, risk assessments and mitigation, infrastructure investments, and understanding injustices and relationality. It is characterized by the Three Ps: People (e.g., who has voice and power and who does not), Place (e.g., locally informed and justice-based), and Planet (e.g., system interconnections, risks, and ecological and nonhuman considerations). At its best, Heterodox Thinking is informed by on-the-ground evidence and multiple disciplines and knowledge, and it seeks to value water, expose power imbalances, support human rights and well-being, and mitigate systemic risks. If effectively operationalized, it can deliver more equitable, risk-mitigated, and sustainable responses to the many different and localized water crises.

Mitigation action in agrifood systems is essential for addressing growing negative impacts from climate change. It remains unclear, however, to what extent mitigation in the agrifood systems space addresses gender inequalities and involves women as agents of climate action. This article reviews the literature to identify the main linkages between gender and mitigation in agrifood systems, examines the key barriers preventing women from equitably participating in and benefiting from mitigation actions in agrifood systems, and concludes with best practices to mainstream gender in mitigation actions in a substantive and sustainable way. Promising approaches include strengthening women's land rights; supporting women's economic empowerment through access to finance, information, and opportunities; and supporting women's groups.

While small-scale irrigation is largely designed and developed for agricultural production, irrigation water is used for multiple other purposes in rural low- and middle-income settings where dedicated water, sanitation, and hygiene services (WASH) are not available. Therefore, expanding access to irrigation can potentially improve the WASH environment leading to health and nutrition benefits. This study examines the linkages between irrigation, use of irrigation water sources for multiple purposes, and WASH and health outcomes. We find that irrigation is associated with better household access to water and improved sanitation facilities. This relationship is driven by households that use groundwater for both irrigation and domestic purposes. Moreover, our results show that hygiene practices and health outcomes are not influenced by irrigation or multiple uses of the same water source. To strengthen hygiene behavior, behavioral change communication will be important. For small-scale irrigation to effectively support WASH and, thus, to strengthen nutrition and health outcomes, systems would need to be co-designed by irrigation and health specialists.

Small-scale irrigation (SSI) interventions have received increasing attention as a potential pathway for women's empowerment in sub-Saharan Africa. One key aspect of women's empowerment that SSI can influence is women's time burden. Hypothesized benefits of SSI for women are less energy exertion and reduced labor in agriculture. Yet, these hypotheses have not been tested empirically. We explore how household adoption of different SSI technologies affects the time allocation of women in the household, using two rounds of intrahousehold panel survey data from Ethiopia. Two different approaches are used to address potential endogeneity issues related to time-constant and time-varying factors that may be correlated with both SSI and time use: an instrumental variables-correlated random effects approach and a fractional multinomial logit-correlated random effects with control function approach. The results suggest that household use of SSI in general is associated with an increase in women's leisure time. The results further suggest that household use of motor pumps is associated with an increase in women's leisure time and reductions in the time they spend on farming and personal care. Given that women often provide the labor for irrigation using manual, labor-intensive methods, such as watering cans, buckets, or hand- or foot-powered treadle pumps, the results suggest that SSI using motorized methods has the potential to free up women's time in farming and enable more leisure time. These findings have broad implications for women's empowerment and labor allocation. Future research using new and more comprehensive data could explore the mechanisms for the findings in this study and determine if SSI enables women to improve their ability to allocate their time to activities they prefer.

The Ethiopian economy relies heavily on rainfed agriculture for income generation, export earnings, and rural livelihoods. However, projections from climate scenarios predict high frequency and intense extreme agro-climatic events, posing significant and growing risks to Ethiopia’s agri-food system and overall economy. This study evaluates the economic impacts of recurrent climate shocks on Ethiopia through 2040 and assesses the contribution of alternative investment options in lessening some of these impacts. Findings reveal that recurrent climate shocks could reduce Ethiopia's cumulative GDP by up to 17 percent (or approximately US534.3 billion) by 2040 compared to a “no climate change” baseline. These economic losses are predominantly concentrated in the agricultural sector, disproportionately affecting rural households and poorer urban populations. Strategic investments in irrigation infrastructure and hydroelectricity generation emerge as effective measures to mitigate some of the adverse effects of recurrent climate variability, underscoring the importance of proactive and targeted climate adaptation strategies for Ethiopia's economic resilience. Results further indicate that significantly mitigating the socio-economic impacts of climate and weather shocks requires scaling up investments and diversifying adaptation strategies. The insights derived from this analysis can be informative to economies with similar structures.

Infrastructure in river basins is essential to achieving several Sustainable Development Goals (SDGs), including SDG 2 on zero hunger, SDG 6 on water and sanitation, and SDG 7 on affordable and clean energy. However, important tradeoffs and synergies need to be navigated across these goals as both water and resources for infrastructure investments are limited. In transboundary river basins, such tradeoffs can transcend countries, creating a complex, interconnected system of water-energy-food linkages. With increasing pressures on the Blue Nile's water resources from population and economic growth and climate change, an analytical framework for joint planning of these essential human development goals at a fine temporal resolution and considering multinational priorities can enhance the potential to achieve water, energy, and food security. In this study, we develop and apply a framework for water resources planning in the Blue Nile using four steps: (1) understanding the water-energy-food nexus management landscape through stakeholder engagement and literature review; (2) developing a detailed daily simulator that captures major nexus components and objectives at a fine temporal scale; (3) linking the simulator to an Artificial intelligence-based search algorithm to design efficient agricultural and dam operation portfolios considering national and sectoral priorities; and (4) presenting the results using interactive visualization tools to facilitate dialogue and support decisions. Our results identify efficient operation plans for large dams on the Blue Nile for alternative cropping patterns in expanded irrigation areas in Sudan that minimize tradeoffs across water, energy, and food objectives.

Groundwater management is highly complex, with many users sharing the same resource often with limited understanding of their interconnectedness. Behavioral experiments (games) that simulate real-life common-pool resource use have shown promise as an experiential learning tool for improving resource governance. This study pilots an experiential learning intervention in Ethiopia using a groundwater game to help raise awareness of groundwater over-extraction and improve understanding of the importance of collective action in governance. In the Meki River catchment in Ethiopia, small-scale irrigation is expanding, but overextraction and competition over groundwater have not yet reached alarming levels. The groundwater game, adapted from India and including the addition of a rule-making round, was played in 15 villages with 30 groups. The game was accompanied by subsequent community-wide debriefing in each village to reflect on the experience and lessons learned, which stimulated discussions about groundwater governance. We surveyed participants to capture individual mental models regarding groundwater use and management, as well as any immediate learning effects. Focus group discussions in each village prior to the intervention and again six months after the intervention assessed possible lasting effects. The findings indicate cognitive, normative and relational learning, including increased understanding of groundwater dynamics (such as the joint effect of diverse water uses and users), the importance of collective action in resource management, and the benefits of communication. We find gendered differences in decision-making about resource extraction in the game and development of group-level resource management, confirming the need for gender-responsive approach to sustainable groundwater management interventions. We discuss community-wide learning and institution-building, and considerations for future intervention designs. We recommend embedding experiential learning, facilitated by local extension officers and other practitioners, in intervention packages that include both technical assistance on water-conserving technologies and groundwater management approaches and support in building communities’ institutional capacity.

The world faces multiple water crises, including overextraction, flooding, ecosystem degradation and inequitable safe water access. Insufficient funding and ineffective implementation impede progress in water access, while, in part, a misdiagnosis of the causes has prioritized some responses over others (for example, hard over soft infrastructure). We reframe the responses to mitigating the world’s water crises using a ‘beyond growth’ framing and compare it to mainstream thinking. Beyond growth is systems thinking that prioritizes the most disadvantaged. It seeks to decouple economic growth from environmental degradation by overcoming policy capture and inertia and by fostering place-based and justice-principled institutional changes. Efforts to address the water challenges that societies face are hindered by a lack of funding and ineffective implementation, as well as poor understanding of the causes. Adopting a beyond growth framing, this Perspective reflects on the responses needed to mitigate water crises around the world.

Information and communications technology has evolved significantly over the last seven decades, beginning with radio and video vans and culminating in the rise of smartphones and mobile internet in remote areas of the Global South. While ICT is an integral part of agricultural extension, little is known about how these changes have influenced agricultural extension practices. After a systematic review of 131 papers, we find that changes in ICT have shaped agricultural extension, enabling a shift from linear dissemination and "one-way communication" to co-innovation and farmer-to-farmer learning. The results indicate the potential for smartphones and mobile internet to democratize agricultural extension.

Emissions reductions may not meet expectations, and groundwater use will likely increase.

The main objective of this study is to understand the interlinkages between different irrigation technologies and management systems and environmental outcomes. We use a unique and comprehensive household and plot-level dataset covering ten districts of Ethiopia complemented with remotely sensed data and qualitative information collected from the study sites. The econometric results show that compared to open-access plots equipped with pump irrigation, other irrigated configurations, and especially private groundwater-based systems, have higher vegetation cover and show less susceptibility to the most common environmental concerns mentioned in the survey regions: water logging, soil salinity, and erosion externalities.

Irrigation expansion is critical for agricultural and rural development, food and nutrition security, and climate change adaptation in Sub-Saharan Africa (SSA). Lack of accessible energy for irrigation development due to limited off- and on-grid infrastructure and the resulting dependence on costly fuel-based irrigation have been key inhibiting factors for irrigation expansion in the region. Off-grid solar-powered irrigation pumps (SIPs) can overcome many of the energy access and other challenges in the region, but their uptake has been slow. Given the nascent development of the solar irrigation sector in SSA, this paper combines a review of the peer-reviewed and grey literature with key informant interviews to identify systemic barriers to the adoption and growth of solar-powered irrigation. We identify uncovered risks, lack of incentives, and lack of capacity as the key factors limiting the adoption of solar-powered irrigation. Moreover, despite significant global cost reductions, solar-powered irrigation systems remain costly in SSA due to limited market development and geographical constraints. Lack of regulation and low investment in building local institutions and value chains further affect uptake and inhibit leveraging the energy transition for ensuring food security and agriculture-led poverty alleviation in SSA. We propose a move away from thinking of SIPs as “silver bullets” and towards a systems approach and the design of context-specific solutions to address risks, incentives and capacity challenges.

This authoritative Encyclopedia provides an innovative approach to theory, reviews, applications and examples relevant to the basic concepts of water science and water management issues in order to facilitate better interdisciplinary cooperation.

The Grand Ethiopian Renaissance Dam (GERD) on the Nile is expected to influence many ecosystem services, such as flood regulation, hydro-electricity production, food supply, and habitat provision, among others. Understanding these impacts (positive and negative) requires a comprehensive evaluation framework. This study develops and applies an integrated simulation framework for assessing the impacts of the GERD on Sudan, focusing on the simultaneous economywide effects of riverine flood hazards, irrigation water supply, hydropower generation, and floodplain-dependent industries, namely traditional fired clay brick production. The simulation framework incorporates three models: a river infrastructure system model, a flood model, and a Computable General Equilibrium Model. Results indicate positive impacts for hydropower generation and flood control, marginal benefits for water supply to existing irrigation, and negative consequences for brick production and the construction sector. Assuming that the GERD starts its long-term operation in 2025, we find an overall positive economic impact on Sudan’s Gross Domestic Product in 2025, with an increase of up to just over 0.1%, subject to river flow conditions. Recognizing the differences in impacts across sectors and income groups, the study emphasizes the need for interventions that ameliorate negative effects. While the study captures several impacts, other effects on the environment, recession agriculture, and soil fertility require further investigation. Still, our findings underscore the importance of adopting an integrated simulation approach to dam evaluation, acknowledging the interconnected nature of water and related sectors in national economies.

Groundwater development is key to accelerating agricultural growth and to achieving food security in a climate crisis. However, the rapid increase in groundwater exploitation over the past four decades has resulted in depletion and degradation, particularly in regions already facing acute water scarcity, with potential irreversible impacts for food security and economic prosperity. Using a climate-water-food systems modelling framework, we develop exploratory scenarios and find that halting groundwater depletion without complementary policy actions would adversely affect food production and trade, increase food prices and grow the number of people at risk of hunger by 26 million by 2050. Supportive policy interventions in food and water systems such as increasing the effective use of precipitation and investments in agricultural research and development could mitigate most negative effects of sustainable groundwater use on food security. In addition, changing preferences of high-income countries towards less-meat-based diets would marginally alleviate pressures on food price. To safeguard the ability of groundwater systems to realize water and food security objectives amidst climate challenges, comprehensive measures encompassing improved water management practices, advancements in seed technologies and appropriate institutions will be needed. Reducing groundwater extraction to sustainable levels may have detrimental impacts on global food security. Improving rainfed water use efficiency and investments in agricultural research and development can ensure sustainable groundwater resources and food security into the future.