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By Ivana Mowry-Mora
When people think about deforestation, they often picture disappearing rainforests, endangered wildlife, or rising carbon emissions. Public health, however, is rarely part of the conversation. Yet a growing body of research suggests that the destruction of ecosystems may also be helping fuel some of the world’s most dangerous disease outbreaks.
From Ebola in West and Central Africa to Nipah virus in Southeast Asia and mosquito-borne diseases spreading under climate change, scientists are increasingly finding the same pattern: when humans rapidly alter ecosystems, disease risk rises.
The connection between environmental degradation and infectious disease is no longer theoretical. It is becoming one of the defining public health challenges of the twenty-first century.
Ebola outbreaks are often portrayed as mysterious events emerging suddenly from remote forests. But recent research tells a more complicated story.
Studies examining Ebola virus disease (EVD) outbreaks across Africa found that many spillover events — the first transmission of the virus from wildlife to humans — occurred in landscapes undergoing rapid environmental change. Rather than untouched wilderness, outbreaks frequently emerged in fragmented forests where agriculture, logging, plantations, roads, and settlements had broken dense forests into smaller patches.
These fragmented environments create what scientists call “edge effects”: zones where humans, livestock, and wildlife increasingly overlap. Fruit bats, widely considered one of the virus’s likely natural reservoirs, may move closer to farms and villages as habitats are disturbed. Other wildlife species associated with Ebola, including primates and forest mammals, can also persist in degraded ecosystems.
Researchers found that:
Forest fragmentation near outbreak sites was significantly higher than the surrounding regional averages.
Many Ebola outbreaks have occurred in recently deforested areas.
In some regions, forest loss within the previous two years strongly predicted Ebola emergence.
The findings challenge the idea that forests themselves are dangerous. Instead, the danger may lie in rapid ecological disruption — especially where expanding human activity collides with stressed wildlife habitats.
The research also points toward another uncomfortable reality: large-scale economic development projects can unintentionally increase outbreak vulnerability.
Across Liberia, Sierra Leone, and Guinea, the years leading up to the 2014–2015 Ebola epidemic were marked by the rapid expansion of mining, infrastructure, and industrial agriculture. Major corporations invested heavily in extractive projects that expanded roads, railways, plantations, and settlements deeper into forested regions.
Scientists argue that these industries can increase disease risk by:
Accelerating deforestation,
Disrupting wildlife habitats,
Increasing migration into remote ecosystems,
Expanding human–wildlife interaction,
And placing pressure on fragile healthcare systems.
Industrial oil palm plantations have drawn particular concern. One study found that large-scale oil palm expansion was consistently associated with increased Ebola spillover risk across Africa. Researchers believe plantations may attract fruit bats because oil palms provide abundant food and shelter, bringing wildlife into closer proximity with workers and nearby communities.
Importantly, smallholder farming did not show the same strong relationship with outbreaks, suggesting that the scale and intensity of industrial land-use change may matter.
Environmental degradation alone does not explain why outbreaks become humanitarian disasters. Social and political conditions matter just as much.
Researchers studying Ebola in Africa argue that the epidemic exposes long-standing structural inequalities rooted in colonialism, extractive economies, and underinvestment in public health. Many communities facing Ebola outbreaks already struggled with:
Weak healthcare infrastructure,
Limited access to clean water,
Poor sanitation,
Political instability,
And deep economic inequality.
Civil wars in Liberia and Sierra Leone had severely weakened healthcare systems long before Ebola arrived in West Africa. Hospitals lacked supplies, surveillance systems were fragile, and rural communities often had little access to medical care. The nexus between extended conflict and rapid environmental degradation is also essential to understanding the present Ebola virus outbreak in the Democratic Republic of the Congo (DRC) and Uganda.
Eastern DRC has faced decades of armed conflict and ongoing insecurity, which means that response workers face real dangers reaching affected communities. Fragile health systems, extreme poverty, and the ongoing impact of funding cuts have left millions of people in the region vulnerable. In some areas, health facilities have almost no protective equipment left for workers to use safely. The outbreak is occurring in areas affected by insecurity, population displacement, mining-related population movement, and frequent cross-border travel, all of which may increase the risk of further transmission. The current Ebola outbreak is a stark reminder of what happens when health systems in conflict-affected countries are left to crumble.
As Ebola spreads, mistrust also becomes a major obstacle. Some communities view governments, corporations, and international health organizations with suspicion because of long histories of exploitation and neglect. In many cases, distrust reflects lived experiences of political exclusion and environmental injustice.
The relationship between environmental change and disease is not limited to Ebola.
Climate change is altering rainfall patterns, temperatures, vegetation cycles, and wildlife migration routes around the world. Scientists warn that these shifts may expand the range of disease vectors such as mosquitoes and ticks, increasing the spread of illnesses like dengue, Zika, chikungunya, and malaria.
At the same time, biodiversity loss may further destabilize ecosystems. Some researchers argue that healthy ecosystems can help regulate disease transmission, while degraded ecosystems may favor species that are especially efficient at carrying pathogens.
Recent Ebola research also suggests that outbreaks may not follow one universal environmental pattern. Some spillovers were preceded by unusual rainfall or vegetation changes, while others occurred under seemingly normal conditions. This complexity highlights how environmental instability can influence disease in multiple ways — through wildlife behavior, migration, food availability, and ecological stress.
One of the clearest lessons emerging from this research is that environmental destruction should no longer be viewed solely as an ecological issue. It is also a public health issue.
The growing “One Health” framework reflects this shift in thinking. One Health recognizes that human health, animal health, and ecosystem health are deeply interconnected. Preventing future pandemics will likely require far more than emergency medical responses after outbreaks begin.
Researchers increasingly call for integrated strategies that combine:
Forest conservation,
Sustainable land-use planning,
Biodiversity protection,
Climate adaptation,
Disease surveillance,
Stronger healthcare systems,
And community-centered governance.
New geospatial technologies are already helping scientists map outbreak vulnerability by combining forest-loss data, wildlife habitats, settlement patterns, and healthcare accessibility. These tools may help governments identify high-risk regions before outbreaks occur.
But the broader message is even more important.
The environmental crises unfolding around the world are not separate from human health. Deforestation, industrial expansion, biodiversity collapse, and climate change are reshaping the ecological systems that regulate disease transmission. As human activity pushes deeper into once-stable ecosystems, the opportunities for zoonotic spillover increase.
Protecting forests, ecosystems, and biodiversity is no longer only about conservation. Increasingly, it may be one of the most important forms of pandemic prevention available.
Allouche, J. (2015). Ebola and extractive industry.
Baranowski, K., & Bharti, N. (2026). Multiple environmental conditions precede Ebola spillovers in Central Africa. Biology Letters, 22(1).
Hudu, S. A., Jimoh, A. O., Amin-Nordin, S., & Syed Hassan, S. (2026). Environmental degradation as a recipe for emerging viral diseases: implications for global health. One Health Outlook.
Jongwattanakul, P., & Ferreira, S. (2024). Oil Palm Plantations, Deforestation, and Ebola Spillover.
Olivero, J., Fa, J. E., Real, R., Márquez, A. L., Farfán, M. A., Vargas, J. M., ... & Nasi, R. (2017). Recent loss of closed forests is associated with Ebola virus disease outbreaks. Scientific reports, 7(1), 14291.
Poirier, O., de Castañeda, R. R., Bolon, I., & Ray, N. (2021). Modelling forest degradation and risk of disease outbreaks in mainland Equatorial Guinea. Journal of Public Health and Emergency, 5.
Rulli, M. C., Santini, M., Hayman, D. T., & D’Odorico, P. (2017). The nexus between forest fragmentation in Africa and Ebola virus disease outbreaks. Scientific reports, 7(1), 41613.
Treffers, S., Ali, S. H., Keil, R., & Fallah, M. (2022). Extending the boundaries of ‘urban society’: The urban political ecologies and pathologies of Ebola Virus Disease in West Africa. Environment and Planning E: Nature and Space, 5(4), 2011-2032.
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