Can Multi-Sector Climate Adaptation Ensure Food Security and Nutrition?

Every year, climate disasters push tens of millions of people toward hunger, yet the world’s response has remained fragmented, with agriculture ministries, health agencies and humanitarian organizations working in silos. Now a team of researchers from the United Nations World Food Programme, the University of California, Los Angeles, Cornell University and the Catholic University of Louvain has delivered the first systematic scoring of how well—and how realistically—multi-sectoral climate adaptation can protect food security and nutrition. Writing in the open-access journal Current Climate Change Reports, the team led by M. C. Tirado evaluated six families of adaptation measures and four cross-cutting enablers, grading each for effectiveness at reducing climate risks and for feasibility of implementation across economic, technical, social, institutional, environmental and geophysical dimensions. The assessment did not stay on the page: its findings and confidence statements were carried directly into Chapter 7 of Working Group II’s contribution to the Intergovernmental Panel on Climate Change’s Sixth Assessment Report, the chapter on health, wellbeing and changing community structure.

The stakes could hardly be higher. More than 820 million people worldwide remain undernourished, 149 million children are stunted and 49.5 million are wasted, while over 2 billion people suffer micronutrient deficiencies. Undernutrition contributes to more than 3.1 million maternal and child deaths every year—nearly half of all deaths among children under five—and stunting in the first 1,000 days of life impairs cognitive development, school performance and future earnings, draining the equivalent of up to 10 percent of gross domestic product annually in parts of Africa. At the same time, the paradox of the modern food system is that 40.1 million children under five are overweight and 2.1 billion adults are overweight or obese. Food systems themselves generate between 21 and 37 percent of global greenhouse gas emissions, and imbalanced diets—low in fruits and vegetables, high in salt, sugar and processed meats—now rank as the number one risk factor for mortality worldwide.

Climate change undermines nutrition through every link in the food chain, the review finds, hitting food production and availability, the stability of supplies, economic access to food and the body’s utilization of nutrients. Rising prices for shrinking harvests squeeze purchasing power, hurting low-income consumers first and pushing diets toward cheaper calories. Elevated atmospheric carbon dioxide adds a stealthier threat: modeling studies show that higher CO2 concentrations dilute protein, iron and zinc in staple crops, quietly stripping nutrients from the global plate. The authors identify three principal projected risks—reduced energy intake, decreased availability of fruits and vegetables, and lower micronutrient content of staple foods. The consequences are already measurable. Between 2015 and 2019, extreme climate events were the main driver of acute food insecurity for an estimated 166 million people across 31 countries who required humanitarian assistance, including 45.1 million in the Horn of Africa and 13.2 million in Central America’s Dry Corridor. El Niño-driven droughts and floods in 2015–2017 pushed 103 million people in 26 countries into crisis-level food insecurity on the Integrated Food Security Phase Classification scale.

To convert a sprawling evidence base into decision-grade conclusions, the team used a rapid review—a streamlined method that follows the principles of a systematic review but compresses the timeline for policy use. The researchers screened literature published between 2014 and 2020 in Scopus, Web of Science and Google Scholar, supplemented by United Nations and World Bank reports, ultimately selecting 80 case studies, empirical analyses and scenario-modeling papers. Each adaptation category was then scored using the feasibility framework introduced in the IPCC’s Special Report on Global Warming of 1.5 °C, which evaluates options across six dimensions through nineteen indicators. Effectiveness was defined as the degree to which an option reduces the likelihood or consequences of climate risks: cutting more than 75 percent of baseline damage counted as high, 25 to 75 percent as medium, and less than 25 percent as low. Feasibility reflected the weight of reported implementation barriers, with scores above 2.5 indicating high feasibility and scores below 1.5 flagging options likely to stall.

Four adaptation categories emerged as highly effective, with implementation rated moderately to highly feasible. The first bundles dietary access with production: improving availability of sustainable, affordable, healthy diets drawn from climate-resilient, nutrition-sensitive and agroecological food systems. Integrated agroecological approaches combine mixed crop–livestock–fisheries and agroforestry arrangements, harness biodiversity, recycle biomass and reduce dependence on costly external inputs, making farms more resilient to climate shocks while diversifying household diets. Participatory agroecological research in Malawi, for example, links farmer-led experimentation with improved food security and dietary diversity. These systems draw on indigenous and local knowledge, farmer-to-farmer learning and collective governance, and treat food as a common good and a human right rather than a mere commodity. Crucially, the authors note, agroecology is only nutrition-sensitive when it confronts social inequities: programs that ignore gender, race and class divisions consistently underperform, while those that empower women generate mutual reinforcement between equity and resilience.

The second category reaches beyond the farm gate: universal access to health care—including child, maternal and reproductive services—alongside nutrition services and water, sanitation and hygiene, known in the sector as WASH. When climate disasters strike, an urgent tier of response saves lives: immediate food assistance, school meals, cash transfers and labor-based safety nets, plus direct nutrition interventions such as exclusive breastfeeding for the first six months, complementary feeding, vitamin A supplementation, therapeutic zinc for diarrhea, deworming and ready-to-use therapeutic foods for severe acute malnutrition. Integrating WASH into nutrition programs is critical, since droughts and floods contaminate drinking water and worsen the infections that compound undernutrition. The third category is anticipatory: early warning–early action systems such as USAID’s Famine Early Warning Systems Network, FAO’s Global Information and Early Warning System, and the IPC classification, which grades acute food insecurity on a standardized scale used to size humanitarian responses. These systems pay for themselves. During Kenya’s 2017 drought, effective early action triggered by early warnings meant roughly half a million fewer people needed humanitarian assistance than in comparable droughts, and investments in Earth observation and forecast-based finance are now seen as essential to keep pace with intensifying extremes.

The fourth high-performing category is nutrition-sensitive, shock-responsive social protection. Cash and food transfers, public works programs and school feeding schemes protect families from selling assets or pulling children out of school when droughts hit, and they can be scaled up automatically when early warnings flash. Ethiopia’s Productive Safety Net Program, one of Africa’s largest, has improved children’s nutritional outcomes partly by improving household food consumption and reducing child labor, while school feeding programs improve health and education outcomes, especially among girls. The review finds that programs integrating social protection with disaster risk reduction and climate adaptation are more likely to foster preventive, transformative interventions than schemes pursuing those goals separately, and this category ranked among the most feasible overall, despite socio-cultural and institutional barriers. Financial instruments such as index-based weather insurance scored lower—moderately effective and feasible—hampered by economic and institutional obstacles. Initiatives like the WFP–Oxfam R4 Rural Resilience Initiative in Ethiopia, which bundles insurance, microcredit, savings and natural-resource management, show promise, but the authors caution that poorly designed insurance can transfer new risks onto poor households, including heavier debt burdens.

Perhaps the review’s most distinctive contribution is its formal treatment of cross-cutting enablers—factors that rarely appear in technical adaptation portfolios but determine whether measures succeed. Women’s and girls’ empowerment topped the list: long-term, multi-country analyses covering more than 115 countries identify women’s education and equality policies as key drivers of historical reductions in malnutrition, and empowered women have measurably raised their communities’ climate resilience. Education acts as a multiplier of co-benefits: higher educational attainment is strongly associated with the adoption of more adaptation practices, which in turn correlate with higher food security and lower poverty, particularly when climate information is shared and legitimized through peer networks. Rights-based approaches and good governance—grounding adaptation in the rights to food, health and water—make livelihood gains last longer and take deeper root. Finally, the humanitarian–development–peace nexus recognizes that food and water insecurity fuel conflict, and that building resilience in fragile, crisis-prone regions requires addressing these root causes together.

The assessment also exposes a glaring policy blind spot. Despite more than a decade of advocacy, adaptation measures for malnutrition have been largely absent from the national adaptation plans and programs of action of the least developed and low-income countries hit hardest by hunger. Only 27 percent of least developed countries with national adaptation plans identified nutrition as a priority, and just 26 percent of low-income countries did so in their first national climate pledges—a gap the authors trace partly to vulnerability assessments that simply fail to count malnutrition. To guide implementation, they map a three-tiered timeline: urgent measures such as therapeutic feeding, food assistance and cash transfers when climate emergencies strike; short-term investments in climate services, anticipatory action and forecast-based finance; and medium- to long-term transformation of food systems. That long-term vision includes shifting subsidies from commodity crops that feed ultra-processed foods toward fruits, vegetables and pulses. Diverse, plant-rich diets aligned with World Health Organization recommendations could cut global mortality by 6 to 10 percent and food-related greenhouse gas emissions by 29 to 70 percent relative to a 2050 reference scenario, and diets matching the EAT-Lancet planetary health reference could prevent up to 11.1 million deaths per year by 2030—though its cost currently exceeds the income of more than 1.6 billion people, underscoring that healthy diets must also be made affordable.

The authors are candid about limits: a rapid review cannot match the exhaustiveness of a full systematic review, and findings from specific countries and regions cannot always be extrapolated beyond similar climatic, socio-economic and political contexts. Yet the overall message is unambiguous. Effective adaptation exists, it is largely feasible, and it is being neglected in the places that need it most, blocked by siloed ministries, poorly defined institutional roles and capacity constraints. The review closes with a warning that doubles as a prescription: there will be no resilient development with malnourished children, and no food security for communities left dangerously exposed to extreme climate events. Combining multi-sectoral adaptation with ambitious mitigation of food-system emissions—through Climate Resilient Development Pathways that improve access to local, affordable, healthy diets—the authors argue, is the only credible route to the Sustainable Development Goals on poverty, hunger, health and climate action, and to securing climate-resilient food systems for all beyond 2030.