Climate Is Forcing People to Move; WHO Wants Health Systems Prepared

The World Health Organization has launched a global research action plan to examine how climate change, migration and displacement interact to affect health and access to care. The initiative seeks to close evidence gaps that complicate government efforts to build climate-resilient health systems that include migrants and displaced populations.

The World Health Organization (WHO) has launched a global research action plan to examine how climate change, migration and displacement combine to affect health, placing a rapidly expanding policy challenge more firmly on the international public-health agenda. The initiative aims to close evidence gaps that make it difficult for governments to protect migrants and displaced people during climate-related emergencies and over the longer term.

Developed jointly by WHO's Health and Migration programme and its Climate Change, Energy and Air Quality team, the plan focuses on three areas: the social determinants of health, universal health coverage and emergency preparedness. It also identifies health data, health outcomes, policy development and practical interventions as priorities that cut across those themes.

The roadmap is not itself a healthcare programme, nor does it guarantee new services, funding or legal protections. Its immediate purpose is more foundational: to help governments, researchers and health institutions determine what they need to study, measure and understand before they can design more effective responses.

A health crisis hidden inside climate mobility

Climate-related migration is often discussed primarily as a question of borders, housing, humanitarian relief or disaster response. The WHO initiative highlights another dimension: what happens to people's health when environmental pressures force or contribute to movement, and what happens when healthcare systems fail to move with them.

Displacement can expose people to new health risks while interrupting access to existing services. The consequences may extend far beyond the immediate aftermath of a climate-related event. WHO's research priorities include mental health, maternal and child health, chronic diseases and the long-term health effects of migration and displacement.

Health needs do not end when people leave an emergency zone. Pregnant women may require continued maternal care. Children may need vaccinations and routine services. People managing chronic conditions may depend on medication, monitoring and regular treatment. Those experiencing trauma or prolonged uncertainty may need sustained mental-health support.

The challenge is therefore not limited to emergency medicine. It involves continuity of care across journeys, temporary settlements, changing jurisdictions and sometimes prolonged periods of instability. This makes climate-related mobility a test of whether health systems are designed around administrative boundaries or around the realities of how vulnerable populations live and move.

The evidence gap is becoming a policy risk

Governments increasingly recognise that climate change, migration and health are connected. Recognition, however, is not the same as having enough evidence to shape policy.

Authorities need to know which populations face the greatest risks, which health conditions are most likely to worsen, where access to care breaks down and which interventions produce measurable results. They also need research capable of distinguishing between different climate-related events, forms of movement and stages of displacement.

Without that detail, governments risk relying on broad assumptions. Policies may treat migrants and displaced people as a single, uniform group despite major differences in legal status, living conditions, healthcare needs and exposure to environmental hazards.

WHO's Global Research Prioritization Exercise attempts to bring greater structure to this field. It was developed through literature reviews, technical consultations, stakeholder engagement and an international survey of 59 experts from governments, research institutions and health organisations.

Its emphasis on social determinants of health is particularly significant. A person's health is shaped not only by medical treatment but also by housing, income, working conditions, legal status, social protection and the ability to obtain essential services. Climate-related displacement can disrupt several of these factors at once.

Research that focuses only on disease or injury may therefore miss the wider mechanisms through which displacement affects health. WHO's framework suggests that understanding those mechanisms is necessary for policies aimed at reducing health inequalities rather than merely responding to their consequences.

Inclusion will determine whether the research delivers

WHO officials have placed health equity at the centre of the initiative. Dr. Santino Severoni, Head of WHO Health and Migration, said migrants and displaced people should be included from the beginning when countries develop climate-resilience strategies and work towards universal health coverage.

The principle shifts the policy question from how systems should react after people become displaced to whether mobile and vulnerable populations are considered during the design of health services in the first place.

Universal health coverage is intended to ensure access to needed services without financial hardship. For migrants and displaced populations, however, coverage may be complicated by legal, administrative, financial or practical barriers. A health service may formally exist while remaining difficult to reach or use.

The roadmap's call for migration-sensitive health data systems could help governments identify such gaps. Better information could reveal where services are being interrupted, which groups are being excluded and how health outcomes differ across populations.

However, more data is not automatically better policy. The collection and management of information involving migrants and displaced people will require attention to consent, privacy and trust. Data systems that are poorly designed or insufficiently protected could discourage vulnerable people from engaging with health authorities.

Community participation is more than a procedural detail. Involving affected populations in research can help institutions ask more relevant questions, understand barriers that may not appear in official statistics and design interventions that people are more likely to trust.

The real test begins after the launch

Dr. Diarmid Campbell-Lendrum, Head of WHO Climate Change, Energy and Air Quality, said stronger scientific evidence is needed to help governments build health systems that are both climate-resilient and equitable.

Producing that evidence will require cooperation across sectors that do not always operate through the same institutions or priorities. Health ministries, climate agencies, migration authorities, emergency services, researchers, humanitarian organisations and local healthcare providers may use different definitions, datasets and planning systems.

The roadmap provides a common direction, but implementation will determine its value. The next developments to watch will be whether governments incorporate the priorities into national and regional strategies, whether research funding follows, and whether countries with limited research capacity receive meaningful support.

Another measure will be whether migrants and displaced communities participate in setting research agendas rather than being treated only as subjects of study. Their involvement could shape which health problems receive attention and whether proposed solutions reflect conditions on the ground.

The initiative also raises a difficult timing issue. Governments cannot wait for a complete evidence base before responding to climate-related displacement. Emergencies are already affecting population movement and public health. Policymakers must improve preparedness and access to care while research continues.

WHO's plan cannot resolve that tension by itself. It can, however, make future decisions more informed and expose where existing health systems remain poorly prepared for mobility driven or intensified by climate pressures.