Climate variability, adaptation and mobility in Senegal: A multicausal analysis of selected hotspots

For centuries, people have moved across the landscape to survive. When rains fail, families might send a son to the city to find work, or a group might shift their herds to greener pastures. This movement is not a sign of failure; it is a long-standing strategy for keeping a household alive when the weather turns against them. In recent years, scientists and policymakers have begun to call this kind of movement "adaptation." The idea is simple: if the climate changes, people move to where life is still possible. However, this view often treats migration as a single, straightforward reaction to a changing environment, as if a person packs a bag and leaves solely because the rain stopped.

The reality is far more complex. People do not live in a vacuum; they live within histories of inequality, economic shifts, and political decisions that shape where they can go and where they must stay. A new study by Elisa Magnani, a researcher at the University of Bologna, explores this complexity by looking at Senegal, a country in West Africa that has faced severe droughts and shifting weather patterns since the 1970s. The research asks a critical question: when we talk about adapting to climate change, are we just looking at people moving, or are we seeing how different strategies—like building walls, moving entire villages, or families sending members away—interact to change the very ground people stand on? The findings suggest that adaptation is not a simple fix that reduces danger for everyone. Instead, it often reshapes who is safe and who is at risk, sometimes moving the problem from one place to another rather than solving it.

To understand this, one must look at the history of Senegal. The country has long been a place of movement. For generations, Senegalese households have managed uncertainty by sending some members away while others stay behind, creating a network of support that stretches from rural villages to bustling cities. This pattern existed long before modern climate policies were written. When the Great Drought hit the Sahel region in the 1970s, it did not create a new system of migration; it intensified and redirected an old one. Rainfall dropped by up to half in some areas, the soil dried out, and the coast began to erode. Families responded by moving, but they did not just flee; they navigated a landscape already transformed by decades of economic change and population growth. Today, adaptation policies are entering a world that has already been reshaped by these long-term forces.

Magnani's study focuses on three specific places along the Senegalese coast to see how these forces play out on the ground. The first is Rufisque, a coastal town where the land is slowly being swallowed by the sea. Here, the government has built sea walls and other engineering projects to protect the coastline. Surprisingly, the people living there do not see these massive concrete structures as foreign impositions. Instead, they view them as a way to "live with" the changing climate. The walls allow families to stay in their homes and keep their livelihoods, reducing the need to move. In this case, a high-tech, government-led intervention supports the local desire to remain in place, showing that infrastructure can sometimes increase a community's ability to adapt by keeping them safe where they are.

The story changes in Lac Rose, a salt lake further south. In the 1970s and 1980s, this area became a magnet for internal migrants seeking work in salt harvesting and tourism. For individual families, moving to Lac Rose was a smart adaptation strategy; it opened up new income sources and helped them survive. However, as more people arrived, the pressure on the land and water grew. The lake began to shrink, the water became too salty for some uses, and the environment degraded under the weight of industry and agriculture. What started as a successful move for a single household eventually contributed to a larger crisis that made the whole area less viable. This illustrates a difficult truth: a strategy that helps one family survive can, when multiplied by thousands of people, change the environment so much that it hurts everyone. The ability of a household to adapt does not always mean the region as a whole is becoming more resilient.

The most striking example of unintended consequences comes from Saint Louis, a historic city at the northern end of the coast. In 2003, heavy rains threatened to flood the city. To save it, authorities cut a channel through a narrow strip of land called the Langue de Barbarie, allowing floodwaters to rush out to the ocean. The immediate goal was achieved, but the channel, known locally as "the breach," kept widening. It let saltwater into the lagoon, destroyed local ecosystems, and accelerated coastal erosion in other areas. The village of Doune Baba Dieye, located nearby, was eventually submerged by the sea, a direct result of the engineering meant to protect the city. The solution for one place created a new vulnerability for another.

This pattern continued with planned relocation. As erosion threatened fishing villages, the government moved families inland to a new settlement called Khar Yallah, which means "waiting for God." The new site was safer from the waves but far from the sea, lacking transport, services, and access to the fishing grounds that defined the residents' lives and culture. Many people found the new location so difficult that they chose to return to their crumbling, flood-prone homes by the water. Their return was not a refusal to adapt; it was a desperate attempt to regain access to their livelihoods and their community. The relocation had reduced the risk of drowning but increased the risk of poverty and isolation.

These cases reveal that adaptation is not a single path. It is a tangled web of decisions where moving and staying are often two sides of the same coin. In Rufisque, staying put is the adaptive choice; in Saint Louis, moving is the official choice, but returning is the human one. The study shows that we cannot simply measure success by counting how many people moved or how many stayed. We must look at what those choices cost. Sometimes, an intervention that protects a city or a specific group of people shifts the danger to a different neighborhood or a different generation.

The research suggests that we need to stop thinking of climate adaptation as a technical problem with a single solution. It is a social and political process that redistributes vulnerability. When a sea wall is built, or a village is moved, or a family sends a member to the city, the balance of safety and risk changes for everyone involved. Some gain the capacity to stay; others lose the capacity to survive. The study argues that we must ask who benefits from these changes and who bears the cost. It is not enough to say that a policy "worked" because it stopped a flood; we must also ask if it made life unlivable for the people who were moved, or if it simply pushed the danger down the coast.

Ultimately, the paper calls for a broader view of how people respond to a changing world. Migration is not just a reaction to a disaster; it is part of a long history of how people navigate uncertainty. Adaptation is not just about building walls or moving people; it is about how those actions reshape the land and the lives on it. In Senegal, as in many places facing climate change, the future will not be decided by a single strategy. It will be shaped by the complex interaction of old traditions, new technologies, and the hard choices people make when the ground beneath them begins to shift. The goal is not to find a perfect fix, but to understand how our choices today will determine who can move, who can stay, and who will be left behind.