Climate-driven changes in temperature, moisture, and extreme weather are altering where and how often fungal diseases occur. Researchers and public health agencies identify several interacting drivers that change geographic range, seasonality, and host susceptibility, with real-world consequences for human health, agriculture, and wildlife.
Mechanisms linking climate and fungi
Warming increases the thermal envelope available to many fungi, allowing species once restricted to tropical regions to survive at higher latitudes and elevations. Matthew C. Fisher at Imperial College London has described how shifts in temperature and precipitation can expand suitable habitats for pathogens that infect people and animals. Extreme weather such as floods and droughts alters soil disturbance and aerosolization of spores, increasing exposure in some communities. Changes in humidity and vegetation affect fungal growth cycles and phenology, while rising atmospheric CO2 and land-use change modify host plant and animal communities, indirectly influencing pathogen dynamics. Arturo Casadevall at Johns Hopkins Bloomberg School of Public Health has proposed that warming may have contributed to the emergence of new human fungal threats by selecting for strains more tolerant of mammalian body temperatures, a hypothesis offered to explain the sudden appearance of Candida auris.
Consequences for health, ecosystems, and livelihoods
Public health consequences include increased incidence and geographic spread of diseases such as coccidioidomycosis in North America, where the Centers for Disease Control and Prevention documents expansions of risk areas associated with climate variability. Clinical burdens may rise as more people are exposed, especially among the elderly, immunocompromised, and communities with limited access to healthcare. Agricultural impacts include altered patterns of crop fungal diseases and mycotoxin contamination that threaten food security and livelihoods in vulnerable regions. Wildlife effects are profound; fungal pathogens have driven declines in amphibians and bats, with cascading ecosystem consequences that vary by territory and culture, affecting subsistence practices and biodiversity valued by Indigenous peoples.
Response requires stronger surveillance, targeted research, and public health preparedness. The World Health Organization underscores the need for integrated monitoring across human, animal, and environmental health sectors. Mitigation of climate change reduces long-term risk, while local adaptations such as improved diagnostics, occupational protections for farm and construction workers, and culturally informed outreach can lower immediate harms. Uncertainties remain about the pace and local patterning of changes, but consensus among researchers and health institutions points to climate as an important, growing factor shaping fungal disease distribution and incidence.