Climate stress turns migration into a survival strategy in vulnerable nations

Climate change, food insecurity, economic growth and migration are reinforcing one another in some of the world’s most climate-vulnerable countries, creating a policy challenge that cannot be solved through isolated action, according to a new study published in Sustainability.

The study, titled Exploring the Linkages Between Climate Change, Food Security, Economic Growth, and Migration in Selected Countries, examines nine countries ranked near the bottom of the Notre Dame Global Adaptation Initiative index: Chad, the Central African Republic, Eritrea, the Democratic Republic of Congo, Guinea-Bissau, Afghanistan, Mali, Sierra Leone and Madagascar.

The findings show that climate pressures, food supply, economic activity and migration interact through feedback loops that can intensify instability in countries already marked by low institutional capacity, poverty, weak infrastructure, agricultural dependence and limited climate adaptation resources.

Climate shocks and food insecurity reinforce each other

The study identifies a bidirectional causal relationship between climate change and food security, indicating that climate pressures weaken food supply while food production systems can also contribute to environmental stress when pursued through unsustainable practices.

The researchers used carbon dioxide emissions excluding land use, land-use change and forestry as the climate-change proxy, and the food production index as the food-security indicator. While these proxies do not capture every dimension of climate vulnerability or food access, they allow the authors to examine long-term relationships across countries with comparable data.

The results show that climate-related pressures can reduce agricultural productivity, disrupt food availability and increase exposure to food-price shocks. In low-income countries where farming remains central to livelihoods, these effects can deepen poverty and weaken economic resilience.

Food systems can also feed back into climate pressures. Agricultural expansion, overuse of land, deforestation, water depletion and unsustainable production practices can raise environmental stress. In vulnerable countries, attempts to boost output without sustainable resource management may intensify the very climate pressures that threaten food security. This is vitally important because many of the countries studied face weak food-security systems and limited ability to absorb shocks. In such contexts, a decline in crop production is not merely an agricultural issue. It can become an economic and social crisis, pushing households toward coping strategies such as migration, reduced consumption or reliance on humanitarian support.

The study also finds a mutual relationship between food security and economic growth. Food supply and economic activity influence each other, making agricultural stability central to development. Stronger food systems can support growth by improving welfare, employment and productivity. Economic improvements can also strengthen food supply if they are directed toward rural infrastructure, agricultural productivity, water systems and social protection.

However, the relationship can become damaging when growth depends on carbon-intensive activity or when economic expansion leaves agriculture underfunded. The authors caution that growth strategies in fragile economies must be evaluated alongside food security and environmental sustainability. Economic expansion that ignores climate risk can increase emissions and worsen the pressures that undermine agriculture.

Migration emerges as a survival response, not only an economic choice

Migration is closely tied to climate pressures, food supply and economic growth. In the countries examined, population movement reflects a broader survival dynamic shaped by environmental and economic insecurity.

The analysis uses net migration because comparable data on forced migration, internal displacement and voluntary movement are limited, which means the study cannot separate all forms of migration. The findings indicate that climate and food pressures are linked to migration dynamics, especially in fragile countries where agriculture is a major source of income and employment.

Climate change can trigger migration through several channels. Droughts, floods and irregular rainfall reduce productivity. Lower output can raise food prices and cut household income. In rural communities with few alternatives, these shocks can push people to move in search of work, food, safety or basic services.

The study also finds a relationship between climate pressures and migration, suggesting that climate-induced population movement is not only an environmental issue but also a governance and stability issue. In fragile states, migration linked to climate stress can intensify pressure on cities, public services and labor markets. It can also worsen social tensions where receiving areas already face limited resources.

Food insecurity is also linked to migration. When food supply weakens, households may be forced to relocate, particularly in rural and agriculture-dependent regions. In such cases, migration is less a matter of opportunity and more a strategy to survive deteriorating living conditions.

Economic growth also affects migration, but the relationship is not straightforward. The study finds that economic growth can reduce migration in the long run, suggesting that stronger domestic economies may ease pressure to leave. However, the authors also identify bidirectional dynamics between growth and migration, meaning that population movements can themselves shape economic conditions.

The link is particularly complex in fragile economies. Growth may not be evenly distributed. GDP levels do not necessarily show whether poorer communities benefit, whether rural areas gain opportunities or whether households remain vulnerable to climate shocks. Unequal growth can leave migration pressures unresolved even when national economic indicators improve.

The researchers found no statistically significant short-term causal relationship among most variables, but long-term relationships were more pronounced. This suggests that the crisis loop develops over time rather than through immediate single-year shocks. For policymakers, that means short-term emergency responses are not enough. Long-term adaptation, food-system resilience and inclusive economic planning are required.

Policymakers urged to adopt integrated climate, food and migration strategies

Climate change, food security, economic growth and migration must be addressed together. Treating them as separate policy areas risks missing the feedback loops that drive instability in vulnerable countries, the study points out.

The authors argue that climate adaptation policies should be paired with food-security measures and sustainable economic strategies. Governments and international organizations should support climate-resilient crops, efficient irrigation, sustainable soil management and climate-friendly production practices. These measures can reduce agricultural losses and limit migration pressures linked to food insecurity.

Water and land management are identified as key priorities. In countries where farming is highly exposed to rainfall disruption and drought, resource efficiency is not optional. Better irrigation, protection of water systems, sustainable land use and resilient agricultural planning can help stabilize production and reduce the risk of food crises.

Migration should be integrated into food-security and climate policy. If climate-related food insecurity is already influencing population movement, governments cannot treat migration only as a border-management issue. They need early warning systems, risk modeling, institutional planning and social protection tools that anticipate mobility before crises escalate.

The findings also call for a stronger international governance framework. Current institutions and funding systems are not fully prepared for the scale of climate-driven migration pressures that may emerge in fragile countries. The authors argue that global and national institutions need better coordination to manage climate adaptation, food security and migration together.

The study also highlights the role of sustainable economic growth. Growth strategies that rely heavily on fossil fuels and carbon-intensive production can increase climate pressure. But growth that strengthens agriculture, raises household income, expands employment and improves resilience can reduce migration pressure and support food security.

The findings are closely linked to several Sustainable Development Goals (SDGs), especially zero hunger, decent work and economic growth, and climate action. The authors suggest that progress toward these goals requires a holistic approach because weakness in one area can undermine gains in another.

The research has several limitations. Sudan was excluded because of data constraints, leaving nine countries in the sample. The study covers 1999 to 2022, meaning events after that period are not included. The indicators used for climate change, food security, economic growth and migration do not capture every dimension of each issue. The small sample size may also affect statistical power.