It is widely acknowledged that the world is currently experiencing an unprecedented water shortage, with agriculture being a crucial contributor. This paper presents a synthesis of available evidence, identify knowledge gaps, and make a state-of-the-art synthesis on green water management in Ethiopia. A systematic review methodology was implemented, encompassing the compilation and analysis of peer-reviewed and gray literature. The paper demonstrates that rainfed agriculture, which relies on “green water” (soil moisture from rainfall), accounts for 80% of cultivated land and 60-70% of global crop production. However, green water management has not received adequate attention in water policy and land rehabilitation programs in Ethiopia, where irrigation is limited. The analysis reveals a large yield gap and water productivity gap for major crops like maize, sorghum, and wheat in Ethiopia’s rainfed agriculture. Increasing crop yields through better soil, water, and crop management practices can significantly improve water productivity, offering “windows of opportunity” to enhance food and water security. Thus, a paradigm shift from the traditional narrow focus on soil erosion control towards an integrated green-blue water management approach in water and agricultural policies and programs is urgently required. Increased investments and expertise in green water management at the government level are crucial. Optimizing the use of green water resources in rainfed farming can also unlock Ethiopia’s export potential while improving domestic water and food security through strategic virtual water trade. In conclusion, the review highlights unlocking the potential of green water resources through targeted investments and policy support for rainfed agriculture can significantly contribute to Ethiopia’s water and food security objectives in a cost-effective and environmentally sustainable manner.

Sustainable water management requires integrated approaches balancing competing demands and environmental sustainability. This study introduces the Sustainable Water Optimization Tool (SUWO), an open-source, Python-based simulation-optimization framework for basin-scale surface-water-resources management. SUWO employs the water&ndash:energy&ndash:food&ndash:ecosystem (WEF-E) nexus approach, utilizing a multi-objective genetic algorithm (MOGA) to generate Pareto-optimal solutions and facilitate a trade-off analysis among water uses through simulations of reservoir operations, hydro-energy production, irrigation, and flow regulation. SUWO integrates scenario analysis with multi-criteria decision making (MCDM), enabling the evaluation of various management, climate, and environmental scenarios. The framework was applied to the Sakarya River Basin (SRB) in T&uuml:rkiye, a rapidly developing region pressured by water infrastructure development, hydroelectric power plants (HEPPs), and irrigation expansion. The SUWO-SRB model showed that while Non-dominated Sorting Genetic Algorithm II (NSGA-II) generally exhibited superior performance, NSGA-III presented a competitive alternative. The optimization results were analyzed across four management scenarios under varying hydrological conditions and environmental management classes (EMCs) for the near future. The model results highlight WEF-E nexus trade-offs. Maximizing energy production often impacts irrigation and the ecosystem, while prioritizing sustainable irrigation can reduce energy output. Dry conditions reduce hydropower and irrigation capacity, emphasizing water scarcity vulnerabilities. Ecological deviation negatively correlates with anthropogenic factors.

Demand is growing while supply is uncertain: Globally, the demand for water in agriculture and food systems is growing, alongside competing needs in other sectors. Freshwater consumption is projected to increase by 17 percent between 2020 and 2050, most of it for irrigation, and almost all of it in low- and middle-income countries. At the same time, water availability is becoming increasingly uncertain due to climate extremes, long-term climate change, pollution, and land use changes such as deforestation and wetland degradation. The rising variability and scarcity contribute to competition among different water users. The water supply-demand gap must be addressed: As the gap between water supply and demand increases, both tested and new technologies, policies, and institutions are needed to improve water productivity and efficiency. At the same time, more research is needed to identify solutions that mitigate the negative impacts of water shortages, pollution, and poor water management on food systems as well as to curb the adverse impacts arising from inefficient and wasteful food systems on water resources and the environment. Agriculture and food systems drive many of the pressures on freshwater ecosystems. According to the IUCN Red List, 25 percent of freshwater species are threatened with extinction (IUCN 2024). This loss of biodiversity threatens not only the species themselves but also the vital services they and their ecosystems provide to humanity. With water a connector across sectors, new approaches to management are critical: With rising water scarcity, decisions in areas such as climate, nutrition, energy, and trade policy will increasingly shape the future of water in food systems. To improve water management in food systems, a more integrated, forward-looking approach is needed that considers the broader implications of policies and investments across multiple sectors. In addition, strengthening governance and institutions and empowering farmers, as key stewards of water resources, are essential for sustainable outcomes.

Phytosterols (PS) offer significant health benefits in human diet, but its poor solubility limits its effectiveness and application. This study explored enhancing PS solubility by testing thirteen food-grade coformers, three preparation methods and proportions screening to obtain the optimal formulation. Nicotinamide (Nic) was identified as the most effective coformer. A 20:1 (w/w) PS-Nic co-amorphous (CM) mixture, prepared via freeze-drying, achieved a solubility of 1536.4 μg/mL, significantly higher than pure PS. X-ray diffraction and differential scanning calorimetry confirmed the amorphous state of the mixture. Fourier-transform infrared, Raman, and 1H NMR spectroscopies, along with molecular dynamics simulations, revealed strong intermolecular interactions between PS and Nic. The PS-Nic CM demonstrated up to 60% in vitro dissolution and release within 2 h and maintained stable after storage at 4 °C for 6 months and under accelerated conditions equivalent to 10 months at room temperature. In sum, the crystal structure of PS was altered, and formed a co-amorphous system by using Nic as the optimal ligand via lyophilization to increase solubility. These findings suggest that the PS-Nic CM system has potential applications in functional foods, offering a feasible strategy to enhance the bioavailability of PS.

Demand is growing while supply is uncertain: Globally, the demand for water in agriculture and food systems is growing, alongside competing needs in other sectors. Freshwater consumption is projected to increase by 17 percent between 2020 and 2050, most of it for irrigation, and almost all of it in low- and middle-income countries. At the same time, water availability is becoming increasingly uncertain due to climate extremes, long-term climate change, pollution, and land use changes such as deforestation and wetland degradation. The rising variability and scarcity contribute to competition among different water users. The water supply-demand gap must be addressed: As the gap between water supply and demand increases, both tested and new technologies, policies, and institutions are needed to improve water productivity and efficiency. At the same time, more research is needed to identify solutions that mitigate the negative impacts of water shortages, pollution, and poor water management on food systems as well as to curb the adverse impacts arising from inefficient and wasteful food systems on water resources and the environment. Agriculture and food systems drive many of the pressures on freshwater ecosystems. According to the IUCN Red List, 25 percent of freshwater species are threatened with extinction (IUCN 2024). This loss of biodiversity threatens not only the species themselves but also the vital services they and their ecosystems provide to humanity. With water a connector across sectors, new approaches to management are critical: With rising water scarcity, decisions in areas such as climate, nutrition, energy, and trade policy will increasingly shape the future of water in food systems. To improve water management in food systems, a more integrated, forward-looking approach is needed that considers the broader implications of policies and investments across multiple sectors. In addition, strengthening governance and institutions and empowering farmers, as key stewards of water resources, are essential for sustainable outcomes.

In this study, a conceptual model based on dynamic systems was developed to optimize the management of water, land, and agricultural production (tea and rice) in the irrigation zones of the Sefidroud irrigation and drainage network. To understand the behavior of the network and create a simulation model of the system, a dynamic systems modeling approach was employed, and the simulation was conducted using MATLAB/Simulink. Subsequently, the optimization model of the studied system was developed as a multi-objective model using a genetic algorithm. Various management scenarios were implemented through the weighting of the objective functions. The results showed that selecting the best response from multi-objective optimization models depends on the weighted values of the objective functions, and by changing these values, decision-makers can provide various responses to complex optimization problems. The optimization model determines the cultivated area and water allocation in such a way as to minimize water scarcity and maximize crop performance through different weighting combinations. Furthermore, the findings indicate that the canals of the irrigation network play a crucial role in meeting water needs, and equitable water allocation is essential to prevent excessive extraction and negative consequences, such as saline intrusion and land subsidence. The study demonstrates that the best solutions are contingent upon local conditions and decision-makers' policies. To achieve maximum economic benefits and address water needs, it is suggested to use a weighting combination close to (w1=1,w2=2). Ultimately, this model assists managers and decision-makers in minimizing water scarcity in the region by adjusting cropping levels and optimizing the use of available water resources.

The Mediterranean region faces significant challenges within the Water-Energy-Food-Ecosystem (WEFE) Nexus due to water scarcity, increasing agricultural and energy demands, and ecosystem degradation exacerbated by climate change. This research addresses these challenges by integrating two water footprint (WF) methodologies, the volumetric Water Footprint Assessment (WFA) and the impact-oriented Water Scarcity Footprint (WSF) and then correlating the results with the WEF Nexus Index and other sustainability indicators, to explore trade-offs and synergies across water, energy, food, and ecosystem dimensions at multiple scales. Findings highlight that the most significant impacts of water consumption stem from the cultivation of water-intensive crops in water-scarce regions, both within and beyond the Mediterranean. This underscores the pivotal role of virtual water trade and the global implications of local water management practices. The results further reveal critical disparities in water resource use and stress among Mediterranean countries, emphasizing the need for targeted policy interventions and international cooperation to address these challenges. By elucidating the interdependencies between water and the other WEFE Nexus dimensions, this study contributes valuable insights for policymakers, researchers, and stakeholders striving to achieve sustainable resource management and resilience in the Mediterranean region and beyond. | Peer Reviewed | Postprint (published version)