The Role of Climate Change in Disease Emergence: Why the Climate Crisis Is Also a Public Health Crisis - Slum and Rural Health Initiative - Non-Profit Organization
July 22, 2026 The Role of Climate Change in Disease Emergence: Why the Climate Crisis Is Also a Public Health Crisis Oluwadara Asaolu, SRHIN For many people, climate change is synonymous with melting glaciers, rising sea levels, and increasingly unpredictable weather. While these visible consequences dominate public discourse, another crisis is quietly unfolding, one that
July 22, 2026The Role of Climate Change in Disease Emergence: Why the Climate Crisis Is Also a Public Health CrisisOluwadara Asaolu, SRHINFor many people, climate change is synonymous with melting glaciers, rising sea levels, and increasingly unpredictable weather. While these visible consequences dominate public discourse, another crisis is quietly unfolding, one that has profound implications for global health. Climate change is reshaping the way infectious diseases emerge, spread, and affect populations. It is changing where disease-carrying mosquitoes can survive. It is disrupting ecosystems that naturally regulate pathogens. It is forcing wildlife, livestock, and humans into closer contact. And in doing so, it is creating new opportunities for diseases to spill over, spread, and threaten communities around the world. The climate crisis is no longer just an environmental issue. It is a public health issue. How Climate Change Influences Disease EmergenceClimate change does not create viruses or bacteria. Rather, it changes the environmental conditions that influence how pathogens, vectors, animal hosts, and people interact. Temperature, rainfall, humidity, biodiversity, and land use have always shaped the ecology of infectious diseases. As these factors change, so too does the landscape of disease risk. This means diseases can appear in places where they were previously uncommon, transmission seasons may become longer, and outbreaks may become more difficult to predict. Understanding these changing dynamics is critical for epidemic preparedness. Extreme Weather Doesn't End When the Storm PassesFloods, droughts, heatwaves, and storms are becoming more frequent and intense. While their immediate impacts are obvious, their effects on health often continue long after the event itself. Floodwaters contaminate drinking water and sanitation systems, increasing the risk of waterborne diseases such as cholera. Drought forces people and animals to depend on limited water sources, creating new opportunities for disease transmission. Climate-related disasters also displace communities, disrupt healthcare services, interrupt vaccination programs, and weaken disease surveillance, conditions that increase the likelihood of outbreaks. In many cases, the disaster is only the beginning. When Nature Is Disturbed, Disease Finds New PathwaysClimate change rarely acts alone. It interacts with deforestation, biodiversity loss, agricultural expansion, urbanization, and land-use change to transform ecosystems. As natural habitats shrink, wildlife increasingly comes into contact with livestock and human populations. These interactions increase the risk of zoonotic spillover, the transmission of pathogens from animals to humans. Many of the world’s most significant emerging infectious diseases, including Ebola, SARS, COVID-19, and Mpox, have reminded us that the health of humans is inseparable from the health of animals and the ecosystems they inhabit. Protecting forests, conserving biodiversity, and promoting sustainable land use are therefore not only environmental priorities, they are investments in disease prevention. Climate Change Is Also Testing Our Health SystemsThe effects of climate change extend beyond disease transmission. Health systems themselves are becoming increasingly vulnerable. Extreme weather damages healthcare infrastructure, disrupts supply chains, limits access to essential services, and places additional strain on already overstretched health workers. At the same time, countries must contend with multiple, overlapping crises, from climate disasters and infectious disease outbreaks to food insecurity and antimicrobial resistance. Preparing for future epidemics therefore requires building health systems that are resilient to both biological and environmental threats. Why One Health Is More Important Than EverThese interconnected challenges are exactly why the One Health approach has become indispensable. One Health recognizes that the health of people, animals, and the environment cannot be managed independently. Preventing future outbreaks requires veterinarians, physicians, environmental scientists, ecologists, public health experts, policymakers, and communities to work together—not after a crisis begins, but long before one emerges. It also requires listening to communities, strengthening surveillance in both humans and animals, protecting ecosystems, and ensuring that health information is trusted, culturally relevant, and actionable. One Health is not simply a framework for collaboration. It is a strategy for prevention. Moving From Reaction to PreventionFor too long, global health has measured success by how quickly we respond to outbreaks. The climate crisis challenges us to ask a different question:How can we prevent outbreaks from occurring in the first place?The answer lies in investing in stronger surveillance systems, climate-resilient health systems, sustainable agriculture, environmental conservation, community engagement, and interdisciplinary collaboration. These investments may not make headlines. But they are among the most powerful tools we have for preventing the next epidemic. A Healthier Future Depends on the Choices We Make TodayClimate change is reshaping the future of infectious diseases. Whether that future is defined by repeated crises or greater resilience depends on the decisions we make now. The evidence is clear. Protecting the environment is also protecting public health. Strengthening animal health systems is also strengthening human health. Empowering communities with trusted information is also improving epidemic preparedness. These are not separate goals. They are different expressions of the same idea. Because in an interconnected world, the health of people, animals, and the planet will always rise, or fall, together.