Adaptive Climate Migration as a Public Health Imperative
News
Sep 25, 2023
In an era of accelerating global climate change, human mobility has reached unprecedented levels. While it is acknowledged that many cases of human migration in the context of climate change are forced or involuntary, particularly where adaptation measures have failed to achieve sufficient resilience of communities against impending slow- and sudden-onset disasters, there are also many cases where migration is, itself, a voluntary adaptive measure to secure otherwise unattainable physical safety and life-sustaining resources.
In these cases, migration can be viewed as adaptation.
Indeed, the framing of “migration as adaptation” is now widely used in academic literature on climate migration. This perspective has sparked broader recognition that adaptive human movement can bring far-reaching social, economic, and health benefits for migrants and their communities of origin. A quick look at the history of human movement in response to environmental change further reaffirms this.
However, without a favorable policy environment, migrants may not realize or maximize these benefits and may instead face even greater precarity. The potential health consequences of such policy failures are extreme. Vulnerability to sexual and other forms of abuse along poorly safeguarded migration routes may spur severe mental distress and psychological trauma in affected persons.
Simultaneously, prolonged settlement in poorly serviced refugee and internally displaced persons (IDP) camps can severely increase infectious and waterborne disease risk for camp residents. Without access to adequate healthcare services and social supports, urban migrants may also suffer from a myriad of communicable and non-communicable diseases. Meanwhile, “trapped populations”, lacking the option to relocate, will continue to face life-threatening food and water insecurity as their environment undergoes further degradation.
In contrast, supportive policies that enable individuals to move safely and securely from more to less climate-vulnerable regions can benefit global public health protection and disease prevention. As the international public health community has long committed to achieving these goals under the Global Charter for the Public’s Health, it can be argued that climate migration requires a public health response. The WFPHA has put forth several arguments supporting this stance in a 2023 article published in the Journal of Migration and Health.
The health implications of climate-related migration and displacement remain an important area of global research. In June 2026, the WHO published a global research prioritization and action plan addressing health, migration, and displacement in the context of climate change. The report highlights evidence gaps concerning the health of migrant and displaced populations throughout the migration journey, reinforcing the need for coordinated research and policy responses.
Most importantly, forcing individuals to remain in environmentally fragile settings by denying them a viable option to relocate can directly limit adherence to healthy practices. For instance, if seawater intrusion has resulted in salinization of your only available water supplies, you are forced to suffer from hypertension and other health consequences simply to survive.
Likewise, if flooding or drought destroys the month’s harvest and leaves insufficient food, mothers cannot follow best practices for infant and young child feeding and nutrition, no matter how strongly community health providers enforce recommendations.
Migration cannot only improve the health of otherwise disease-vulnerable populations in environmentally fragile settings, but also relieve pressure on already strained, under-resourced healthcare systems in those settings. As many of the regions of the world most vulnerable to drought, heat waves, flooding, and extreme weather events are in low- and middle-income countries, the burden of caring for injured and sick individuals in the face of natural disasters is frequently borne by the very healthcare systems least equipped to deal with such issues.
Facilitating adaptive human movement in response to climate-driven health threats would redistribute this burden and enable disaster-affected individuals to access healthcare services more commensurate with their needs.
From a disease prevention standpoint, enhancing legal pathways for migration would drastically reduce population density in refugee/IDP camps, illegal settlements, and urban slums, all of which, due to poor living conditions and overcrowding, serve as active hubs for disease transmission.
Simultaneously, providing migrants with adequate shelter, nutrition, water, sanitation, and hygiene, and humanitarian aid along transit paths would substantially reduce their vulnerability to contracting infections, waterborne illnesses, and sexually transmitted diseases due to gender-based violence en route.
Finally, stronger international coordination of migration through well-managed, legal asylum-seeking channels would strengthen national capacity to regulate disease screening for individuals crossing borders. Studies show that when legal migration alternatives are inadequate or nonexistent, people on the move will still pursue illegal routes to enter destination sites. This makes epidemiological and demographic tracking at the national level much harder, as people’s whereabouts go unknown and changes to national population makeup remain undocumented.
With this in mind, we can envision how opening safe, legal transit avenues, coupled with well-coordinated screening and registration processes, would substantially reduce this challenge and enable far more timely, robust, and accurate epidemiological projections to inform national public health policy planning. While researchers have widely disputed the contention that migrants are likely disease carriers, secondary screening of border crossers through well-regulated, legal migration procedures would also improve early detection of other illnesses, enabling timely referrals to necessary health services.
Given the potential for adaptive climate migration to contribute towards the achievement of key global public health objectives, the international public health community MUST endorse measures which facilitate it under the right circumstances. Of course, interdisciplinary collaboration to help communities adapt to the impacts of climate change and remain in their often preferred locations of origin remains a key public health responsibility.
Yet, when environmental conditions, in combination with irremediable social, political, and economic vulnerabilities, impede the possibility of achieving a life of dignity, health, and safety, the option to relocate must be enabled, supported, and facilitated, not just a legal/moral imperative, but indeed as a public health one as well. By Hannah Marcus, WFPHA Environmental Health Working Group
Understanding Climate Migration as Adaptation
Indeed, the framing of “migration as adaptation” is now widely used in academic literature on climate migration. This perspective has sparked broader recognition that adaptive human movement can bring far-reaching social, economic, and health benefits for migrants and their communities of origin. A quick look at the history of human movement in response to environmental change further reaffirms this.
However, without a favorable policy environment, migrants may not realize or maximize these benefits and may instead face even greater precarity. The potential health consequences of such policy failures are extreme. Vulnerability to sexual and other forms of abuse along poorly safeguarded migration routes may spur severe mental distress and psychological trauma in affected persons.
Simultaneously, prolonged settlement in poorly serviced refugee and internally displaced persons (IDP) camps can severely increase infectious and waterborne disease risk for camp residents. Without access to adequate healthcare services and social supports, urban migrants may also suffer from a myriad of communicable and non-communicable diseases. Meanwhile, “trapped populations”, lacking the option to relocate, will continue to face life-threatening food and water insecurity as their environment undergoes further degradation.
Why Climate Migration Is a Public Health Imperative
In contrast, supportive policies that enable individuals to move safely and securely from more to less climate-vulnerable regions can benefit global public health protection and disease prevention. As the international public health community has long committed to achieving these goals under the Global Charter for the Public’s Health, it can be argued that climate migration requires a public health response. The WFPHA has put forth several arguments supporting this stance in a 2023 article published in the Journal of Migration and Health.
The health implications of climate-related migration and displacement remain an important area of global research. In June 2026, the WHO published a global research prioritization and action plan addressing health, migration, and displacement in the context of climate change. The report highlights evidence gaps concerning the health of migrant and displaced populations throughout the migration journey, reinforcing the need for coordinated research and policy responses.
Supporting Healthier Living Conditions Through Adaptive Migration
Most importantly, forcing individuals to remain in environmentally fragile settings by denying them a viable option to relocate can directly limit adherence to healthy practices. For instance, if seawater intrusion has resulted in salinization of your only available water supplies, you are forced to suffer from hypertension and other health consequences simply to survive.
Likewise, if flooding or drought destroys the month’s harvest and leaves insufficient food, mothers cannot follow best practices for infant and young child feeding and nutrition, no matter how strongly community health providers enforce recommendations.
Reducing Pressure on Healthcare Systems in Climate-Vulnerable Regions
Migration cannot only improve the health of otherwise disease-vulnerable populations in environmentally fragile settings, but also relieve pressure on already strained, under-resourced healthcare systems in those settings. As many of the regions of the world most vulnerable to drought, heat waves, flooding, and extreme weather events are in low- and middle-income countries, the burden of caring for injured and sick individuals in the face of natural disasters is frequently borne by the very healthcare systems least equipped to deal with such issues.
Facilitating adaptive human movement in response to climate-driven health threats would redistribute this burden and enable disaster-affected individuals to access healthcare services more commensurate with their needs.
Preventing Disease Through Safe Migration Pathways
From a disease prevention standpoint, enhancing legal pathways for migration would drastically reduce population density in refugee/IDP camps, illegal settlements, and urban slums, all of which, due to poor living conditions and overcrowding, serve as active hubs for disease transmission.
Simultaneously, providing migrants with adequate shelter, nutrition, water, sanitation, and hygiene, and humanitarian aid along transit paths would substantially reduce their vulnerability to contracting infections, waterborne illnesses, and sexually transmitted diseases due to gender-based violence en route.
Strengthening Public Health Surveillance and Disease Screening
Finally, stronger international coordination of migration through well-managed, legal asylum-seeking channels would strengthen national capacity to regulate disease screening for individuals crossing borders. Studies show that when legal migration alternatives are inadequate or nonexistent, people on the move will still pursue illegal routes to enter destination sites. This makes epidemiological and demographic tracking at the national level much harder, as people’s whereabouts go unknown and changes to national population makeup remain undocumented.
With this in mind, we can envision how opening safe, legal transit avenues, coupled with well-coordinated screening and registration processes, would substantially reduce this challenge and enable far more timely, robust, and accurate epidemiological projections to inform national public health policy planning. While researchers have widely disputed the contention that migrants are likely disease carriers, secondary screening of border crossers through well-regulated, legal migration procedures would also improve early detection of other illnesses, enabling timely referrals to necessary health services.
The Role of Public Health in Supporting Adaptive Climate Migration
Given the potential for adaptive climate migration to contribute towards the achievement of key global public health objectives, the international public health community MUST endorse measures which facilitate it under the right circumstances. Of course, interdisciplinary collaboration to help communities adapt to the impacts of climate change and remain in their often preferred locations of origin remains a key public health responsibility.
Yet, when environmental conditions, in combination with irremediable social, political, and economic vulnerabilities, impede the possibility of achieving a life of dignity, health, and safety, the option to relocate must be enabled, supported, and facilitated, not just a legal/moral imperative, but indeed as a public health one as well. By Hannah Marcus, WFPHA Environmental Health Working Group