With COVID-19 cases rising again globally and health agencies monitoring potential threats from bird flu (H5N1, H9N2) and yellow fever, global organizations — including the World Health Organization (WHO) — have recognized the ongoing risk. They recently signed a new Pandemic Agreement to improve preparedness, as high-threat infectious hazards continue to increase due to animal agriculture, deforestation, urbanization, and global wildlife trade.
Research over the past several years, particularly the Intergovernmental Panel on Biodiversity and Ecosystem Services (IPBES) Workshop Report on Biodiversity and Pandemics, has revealed how pandemic risk and biodiversity loss are interlinked consequences of unchecked ecological exploitation, economic growth, and lack of effective policy.
These risks compound: habitat destruction not only accelerates species extinctions but creates more pathways for dangerous viruses to emerge, multiply, and move into human populations.
Root Causes: How Human Activity Drives Spillover
Over 70% of new diseases in people—and nearly all pandemics, like COVID-19—originate from animal microbes also known as “zoonoses”. These spillovers occur when human activities disrupt natural barriers, usually through activities like:
Agricultural expansion. Converting natural habitats like forests and grasslands into farmland is responsible for over 30% of emerging disease events, making it one of the strongest predictors of spillover. Land use change like this causes increased contact between humans, livestock, and wildlife, which makes it easier for diseases to pass from wild animals to people (zoonotic spillover).
Intensive livestock production. Factory farms crowd genetically similar animals together in unsanitary dwellings, creating ideal conditions for pathogens to spread and evolve. Animals in factory farms frequently suffer from a variety of illnesses, and many of these conditions often go unnoticed or untreated due to the sheer number of animals and unmanageable animal-to-worker ratios. These environments substantially increase the probability that a disease will jump from animals to humans.
Deforestation. Clearing forests for agriculture, logging, or settlement destroys wildlife habitats and forces animals into closer proximity with people and livestock. More than 70% of deforestation is driven by agricultural expansion, particularly for grazing and feed crops.
Urbanization. Rapid growth of cities creates densely populated areas where diseases can spread quickly and where expanding development pushes into formerly wild spaces, increasing human contact with wildlife.
Global wildlife trade. The legal and illegal trade of wild animals transports pathogens across borders and brings stressed, diverse species into close quarters with humans, creating ideal spillover conditions.
Together, these activities fragment habitats and expose people and livestock to roughly 1.7 million undiscovered viruses, an estimated 600,000 of which could infect humans.
A World Wildlife Fund (WWF) analysis adds that pandemic risk is best understood as feedback loops: agricultural expansion, luxury wildlife demand, industrialization, and global trade all reinforce each other, making spillover not just a single event but the product of complex, interconnected systems.
Increasingly, scientists and policy leaders advocate for the “One Health” approach—a recognition that human, animal, and ecosystem health are inseparably connected. One Health calls for collaborative action across medicine, veterinary science, agriculture, and environmental protection, aiming to address the root causes of disease outbreaks and ecosystem collapse at their source rather than simply reacting to emergencies.
These root causes mirror the forces behind climate change and global inequality: weak regulation, extractive industries, and profit-driven systems that degrade the very ecosystems acting as our first line of defense.
Animal Agriculture: A Major Driver of Climate Breakdown and Pandemic Risk
Animal agriculture sits at the center of both ecological disruption and disease emergence, making it one of the most significant contributors to pandemic risk.
Livestock farming is responsible for 12–20% of global greenhouse gas emissions, produces 37% of human-caused methane, and drives widespread deforestation, water contamination, and biodiversity loss. As global meat consumption rises, the demand for land and feed crops intensifies, pushing agricultural expansion deeper into natural habitats.
Industrial livestock operations also create ideal conditions for infectious disease evolution. Crowded, genetically similar animals enable viruses to spread rapidly and mutate. Many zoonotic pathogens — including avian and swine influenza and antibiotic-resistant bacteria — originated in high-density livestock systems. Live animal transport and global supply chains further amplify transmission risk, moving pathogens across borders at rapid speed.
The ongoing surge in bird flu outbreaks illustrates these risks: in 2025, millions of chickens and turkeys in North America have been killed to contain infection as H5N1 spreads rapidly in crowded factory farms, which serve as hotspots for viral mutation and transmission. When avian flu is detected in a flock, authorities typically employ mass culling methods—such as gassing or suffocation—which kills every bird in the shed to halt the disease’s spread. This process highlights the normalization of suffering and waste in our food systems.
Research consistently shows that transitioning toward plant-based food systems would reduce emissions, restore ecosystems, and significantly lower the risk of emerging pandemics.
Structural Causes: Capitalism, Inequality, and Rising Risk
As discussed in my previous post on climate and wealth inequality, ecological damage is not evenly caused or experienced. Pandemic risk follows the same pattern.
Large-scale deforestation, industrial agriculture, and wildlife commodification are often financed and directed by high-consuming nations and powerful multinational corporations like JBS and Walmart. These actors profit from activities that degrade ecosystems, while the resulting disease and environmental risks are displaced onto communities.
In a growth-focused global economy, capital flows into industries such as factory farming, fossil fuel extraction, mining, and wildlife trade — sectors that depend on cheap land, weak environmental regulation, and low-cost labor. As these industries expand into biodiversity-rich regions, they fragment ecosystems, displace wildlife, and intensify opportunities for spillover. Global supply chains built for speed and efficiency further entrench this dynamic by externalizing environmental and health costs onto exploited nations and communities.
The very industries that degrade ecosystems and compromise community health channel their profits to corporations and wealthy nations, widening the gap between those who bear the consequences and those who reap the rewards.
Many of the world’s spillover “hotspots” lie in tropical regions managed or inhabited by Indigenous and rural communities who often lack the political power to resist industrial expansion by dominant nations. As a result, these communities face polluted waterways, degraded land, inadequate health infrastructure, and increased exposure to zoonotic disease. When outbreaks occur, indigenous and rural communities experience disproportionate illness, loss of income, and long-term social disruption. Meanwhile, high-consuming nations continue to benefit from exploitation and the availability of cheap commodities, while displacing the risks elsewhere.
The WWF highlights that protecting Indigenous land rights, supporting community-led resource management, and ensuring equitable participation in conservation are not simply justice issues—they are frontline strategies for pandemic prevention. Indigenous management consistently leads to better conservation outcomes, healthier forests, and—by extension—lower pandemic risk.
Calls for pandemic justice echo those of the climate justice movement: those who benefit most from ecological destruction must bear the greatest responsibility for prevention, restoration, and reparative action.
How U.S. Policy Has Increased Vulnerability
If we learned anything from COVID-19 its that reactionary approaches to pandemics are slow, expensive, and inadequate to the scale of the threat (WHO). Instead, prevention must start with transforming the policies that drive ecosystem disruption.
However, recent U.S. policy decisions under the Trump administration have amplified vulnerability to disease emergence and environmental harm simultaneously.
For example, despite warnings from experts about the risk of foot-and-mouth disease in Argentinian cattle, the Trump administration moved forward with policies to expand beef imports from Argentina, a decision that raises the risk of introducing animal diseases into U.S. herds and exemplifies the prioritization of economic and trade interests over ecological and public health safety.
The administration has also greatly weakened the authority of the Environmental Protection Agency (EPA), which has resulted in reduced protections against pollution and habitat destruction across millions of acres, leaving vital wetlands and other ecosystems vulnerable to unsustainable development.
Additionally, there have been significant cuts and delays to federal research funding for emerging infectious diseases, undermining efforts at the National Institutes of Health (NIH) and other agencies to develop new diagnostics, vaccines, and treatments, and diminishing the nation’s ability to monitor and respond to public health threats.
Finally, the U.S. withdrawal from the (WHO) disrupted global data sharing and international public health collaboration, creating funding gaps in vital programs, limiting U.S. influence over international health policy, and reducing coordination on pandemic preparedness with global partners..
These decisions mirror broader climate deregulation: short-term economic gains for those in power, long-term social, health and environmental risks for everyone else.
Plant Based Diets as Resistance
When governments prioritize corporate interests over ecological and public health, it is easy to feel powerless. Yet individual choices — especially the ways we eat and where we put our dollars — offer a powerful form of resistance. A plant-based diet directly withdraws support from the industries most responsible for both climate instability and pandemic risk.
A plant-based diet reduces risk across multiple systems:
- Lower pandemic risk: Reducing dependence on factory farming — one of the primary incubators of zoonotic disease — lowers the conditions that enable pathogens to spill over into human populations. Studies show that people eating primarily plant-based diets experience lower COVID-19 severity and improved immune outcomes.
- Reduced land pressure: Animal agriculture uses 80% of global farmland but supplies less than 20% of calories. Shifting to plant-based diets frees vast areas of land for reforestation, ecosystem recovery, and carbon sequestration.
- Climate mitigation: Plant-based diets reduce greenhouse gas emissions by nearly 50%, while also decreasing water use, pollution, and resource depletion.
- Biodiversity protection: Less demand for meat slows deforestation, protects wildlife habitats, and reduces landscape fragmentation — one of the strongest predictors of zoonotic spillover.
Individual dietary choices can activate our collective power. Even small shifts — like choosing plant-based meals a few times per week — reduce pressure on natural habitats and act as a form of climate care.
International health bodies like WHO, IPBES, and the One Health High-Level Expert Panel consistently affirm that addressing pandemic risk requires protecting ecosystems, reducing destructive land use, and prioritizing community well-being over extractive growth.
Conclusion
While plant-based diets strengthen pandemic and climate resilience at an individual level, systemic transformation is needed to address climate and pandemic risk on a global scale.
The most effective pandemic mitigation strategies cited from IPBES to WHO, BMJ, and global One Health networks include:
- Nature-first prevention: Restoring forests, ending deforestation, and protecting biodiversity hotspots maintain the ecological stability that prevents spillover. Healthy ecosystems act as protective shields against emerging infectious diseases.
- Integrated One Health policies: Aligning human, animal, and environmental health strengthens surveillance, early detection, and coordinated responses across sectors. The One Health model is now widely recognized as essential for global pandemic preparedness.
- Community-led conservation: Indigenous and frontline communities consistently achieve stronger conservation outcomes through place-based knowledge, stewardship, and long-term relationships with land. Their leadership protects biodiversity while strengthening social resilience.
- Redirecting funding toward prevention: Investing billions annually in early-warning systems, ecological restoration, and public health infrastructure breaks the costly cycle of reactive crisis management. Prevention is more effective, equitable, and sustainable than emergency response.
These solutions reflect the growing alignment between climate justice and pandemic prevention frameworks. Both demand a shift away from extractive, profit-driven models of growth and promote moving toward long-term ecological stability, community well-being, and global solidarity.
Climate care is pandemic prevention. Biodiversity is a protective shield that stabilizes the climate, regulates ecosystems, and buffers humanity from disease. When we dismantle that shield, the consequences cascade through every aspect of life.
The latest evidence, echoed by WWF, makes clear: The solutions that prevent pandemics are the same ones that restore justice and planetary health— restoring ecosystems, reducing reliance on animal agriculture, supporting Indigenous leadership, and enacting policies that prioritize people and the planet.
