How Climate Change is Threatening Animal Health and Ecosystems

Climate change and air pollution are often discussed in the context of human health, energy policy, and economic impact, but the environmental crisis doesn’t stop with us. What’s frequently overlooked is how these environmental stressors are endangering animals, from household pets to wildlife and aquatic species. Just as humans suffer from the deteriorating air quality and increasing temperatures, animals face respiratory diseases, reproductive challenges, habitat loss, and even extinction. In this blog, we’ll dive into reviewing recent scientific research to explore how air pollution and climate change compromise animal health, alter ecosystems, and disrupt food webs, with far-reaching implications for biodiversity and human well-being.

Heat Stress, and Livestock – Climate Change on the Farm

Modern agriculture must navigate the dual challenge of increasing food production to meet rising global food demands while coping with worsening climate conditions. Livestock, in particular, are highly vulnerable to heat stress, disease, and nutritional imbalance, all of which undermine productivity and animal welfare.

Key Impacts on Livestock Include:

Heat Stress: Elevated ambient temperatures interfere with animals’ ability to regulate body heat, causing increased respiratory rates, dehydration, oxidative stress, and reduced feed intake. This leads to metabolic imbalances and suppressed immunity (Bernabucci, 2019).
Metabolic Disorders: Heat-stressed animals, especially dairy cows, show higher incidences of ketosis and liver lipidosis due to altered energy balances and reduced feed intake.
Immune Suppression: Weakened immune responses make livestock more vulnerable to infections like mastitis and reduce vaccine effectiveness.
Reproductive Challenges: Heat stress impacts hormone secretion and embryo development, particularly in dairy cows, thereby reducing reproductive success (Bernabucci, 2019).
Mortality Risks: Higher death rates occur during extreme weather events, with the Temperature-Humidity Index providing a reliable predictor of mortality spikes (Lacetera, 2019).

Indirect Effects
Climate change is also expanding the geographic range of pathogens and vectors, such as gastrointestinal parasites and mycotoxin-producing fungi. These biological shifts reduce feed quality and increase the risk of disease outbreaks (Lacetera, 2019).

Solutions and Adaptation
To mitigate these effects, researchers emphasize integrated strategies:

Implementing animal health surveillance systems linked with climate data
Enhancing management through cooling systems, shaded shelters, and nutritional adjustments
Selective breeding for heat-tolerant livestock
Encouraging cross-disciplinary research on climate-livestock interactions

Ultimately, safeguarding livestock health is crucial for ensuring food security, promoting rural livelihoods, and fostering sustainable agriculture (Bernabucci, 2019; Lacetera, 2019).

Silent Toll on Wildlife and Pets

Air pollution doesn’t just harm humans–it affects every animal that breathes, drinks, or eats in contaminated environments. From city-dwelling pets to remote wildlife, exposure to pollutants like ozone, nitrogen oxides, and particulate matter (PM2.5) is causing widespread illness and ecological imbalance.

Health Effects on Animals:

Respiratory Illnesses: Like humans, pets and wildlife experience asthma-like symptoms, lung inflammation, and chronic respiratory disease from inhaling pollutants like ozone, PM2.5, and smoke. These symptoms are intensified during wildfire seasons and urban smog events (Airly, 2025; Lacetera, 2019; “Smoke and Pollution Effect Your Pets and Other Animals,” 2021).
Skin and Allergy Problems: Pollutants in the air can irritate skin and trigger allergic reactions in animals, particularly in pets exposed to indoor air contaminants (Gilmour et al., 2001).
Liver Damage: Polluted water sources and contaminated food contribute to liver toxicity, especially in aquatic and scavenger species.
Fertility and Reproduction Issues: Pollutants are known to disrupt endocrine systems, leading to lower fertility rates and developmental problems in offspring.
Risk of Extinction: Species with narrow habitat or temperature tolerances are most vulnerable. Long-term exposure to pollutants can reduce reproductive success and genetic diversity, pushing populations toward collapse (Airly, 2025).

Studies from the Canadian government and Airly confirm that animal health mirrors human environmental exposure, often serving as an early warning system for ecological degradation.

Ecosystem Breakdown: The Air-Food Chain Connection

Air pollution affects individual animal health and the ecosystems they inhabit. Through complex pathways, air pollutants alter water chemistry, soil quality, and vegetation health, which in turn affect the entire food web:

Acid Rain: Caused by sulfur and nitrogen emissions, acid rain lowers pH levels in soil and water, leading to habitat loss for amphibians, fish, and invertebrates.
Heavy Metals: Pollutants like mercury and aluminum accumulate in plants and animals, magnifying through trophic levels and impairing neurological and reproductive health in apex predators (“Air Pollution: Effects on Wild Animals,” 2012).
Algal Blooms: Nutrient-rich pollution, especially nitrogen and phosphorus from agriculture, causes algal overgrowth in water bodies. The resulting oxygen depletion kills fish and disrupts aquatic ecosystems (EPA, 2025).
Ozone Exposure: Reduces photosynthesis in sensitive plants, weakening the base of the food web and reducing shelter and food availability for herbivores and insects.

Disruptions in one species often cascade through the ecosystem. For instance, a decline in fish populations due to acidification may benefit some bird species but deprive fish-eating birds of a food source. These interdependencies highlight the urgent need for holistic environmental protection.

Aquatic Life and Food Security: A Hidden Crisis

Aquatic species are among the most vulnerable to environmental change. Rising temperatures, increased runoff, and the accumulation of pollutants are threatening the biodiversity of both marine and freshwater ecosystems.

Key Concerns:

Thermal Limits: Many fish species operate within narrow thermal thresholds. Even slight warming can reduce oxygen levels in water, cause migration shifts, and increase disease outbreaks.
Bioaccumulation: Toxins like mercury and PCBs (polychlorinated biphenyls) concentrate in aquatic organisms, posing risks to wildlife as well as humans who rely on fish for protein (“Air Pollution: Effects on Wild Animals,” 2012).
Habitat Loss: Coral bleaching, wetland drying, and river acidification reduce habitat availability for countless aquatic species
Food Insecurity: Aquatic ecosystems provide essential nutrition for billions of people. Their collapse could increase malnutrition, particularly in coastal and Indigenous communities.

Protecting aquatic life is essential for maintaining biodiversity and global food systems.

Climate Extremes and Wildlife

Wildlife species are particularly vulnerable and close to their physiological limits in arid and desert regions. In Saudi Arabia, research on species such as the Arabian oryx and the spiny-tailed lizard reveals that rising temperatures push animals closer to their thermal limits (Williams et al., 2012). Many of these species already live at the edge of survivability; even a slight increase in ambient temperature can make the difference between life and death.

Physiological and Behavioral Responses Include:

Shifting activity to cooler hours (nocturnality)
Reduced movement to conserve water and energy
Thermoregulation through behavioral adaptation (e.g., burrowing, shading)

However, these strategies are not sustainable in the long term. When temperatures exceed upper lethal limits (typically around 47 degrees Celsius), even well-adapted species struggle to survive (Williams et al., 2012). Conservation strategies must account for these physiological limits and prioritize habitat preservation, climate modeling, and species-specific research.

What Can Be Done?

The combined threats of air pollution and climate change demand integrated solutions. Here are a few key recommendations from researchers:

Improve Monitoring: Link climate data with animal health surveillance to predict and prevent disease outbreaks (Bernabucci, 2019; Lacetera, 2019).
Enhance Animal Management: Use cooling systems, climate-resilient shelter designs, and improved nutrition for livestock.
Support Ecosystem Restoration: Restore damaged ecosystems to improve resilience against pollution and climate stress.
Enact Stronger Regulations: Limit emissions of harmful pollutants like sulfur dioxide, nitrogen oxides, and heavy metals.
Foster Public Awareness: Public understanding of how environmental health impacts animals can drive policy and behavioral change (Airly, 2025).
Encourage Cross-Sector Collaboration: Governments, researchers, veterinarians, and communities must work together to develop scalable, science-based solutions.

Final Thoughts

Animals are often the forgotten victims of climate change and air pollution. Yet, they serve as sentinels of ecological health, and their decline also signals serious problems for humans. Whether it’s livestock in heat-stressed barns, wildlife in acidified streams, or pets struggling to breathe in smoky air, the message is clear: our environment is under strain, and the consequences reach every corner of the animal kingdom.

Protecting animal health means protecting ecosystems and, by extension, ourselves. It’s time to take science seriously and act urgently.

References:

Air pollution: effects on wild animals. (2012). In Government of Canada.

Airly. (2025). How Does Air Pollution Affect Animals? 6 Deadly Effects. Airly.

Bernabucci, U. (2019). Climate change: impact on livestock and how can we adapt. Animal Frontiers, 9(1), 3–5. https://doi.org/10.1093/af/vfy039

EPA. (2025). Air, Animals and Plants.

Gilmour, M. I., Daniels, M., McCrillis, R. C., Winsett, D., & Selgrade, M. K. (2001). Air pollutant-enhanced respiratory disease in experimental animals. Environmental Health Perspectives, 109 Suppl 4(Suppl 4), 619–622. https://doi.org/10.1289/ehp.01109s4619

Lacetera, N. (2019). Impact of climate change on animal health and welfare. Animal Frontiers, 9(1), 26–31. https://doi.org/10.1093/af/vfy030

Smoke and Pollution Effect Your Pets and Other Animals. (2021, September 24). Sierra Veterinary Hospital.

Williams, J. B., Shobrak, M., Wilms, T. M., Arif, I. A., & Khan, H. A. (2012). Climate change and animals in Saudi Arabia. Saudi Journal of Biological Sciences, 19(2), 121–130. https://doi.org/10.1016/j.sjbs.2011.12.004