A groundbreaking study has revealed that climate change is driving venomous snakes away from their arid habitats and towards densely populated coastal areas, significantly increasing the risk of deadly encounters for millions. The research, published in the journal PLOS Neglected Tropical Diseases, highlights the alarming shift in snake populations towards higher latitudes and urban centres as rising temperatures render their current habitats less viable.
A Grim Forecast for Coastal Dwellers
Researchers predict that by the years 2050 and 2090, snake populations will predominantly migrate towards the east coast of Australia, moving from the arid interior into more populous southern regions. This shift is not confined to Australia; globally, the study identifies regions such as Sub-Saharan Africa, South Asia, and Southeast Asia as areas where human-snake interactions are set to intensify.
According to the findings, the four venomous snake species most likely to increase their exposure to human populations by 2090 include the black-necked spitting cobra, the many-banded krait, the cottonmouth, and the copperhead. The study notes, “Before this research, surprisingly little was known about the exact distribution of many medically important snakes,” underscoring the urgent need for better data on snakebite incidents.
The Human Toll of Snakebites
Snakebites are a significant public health issue, with approximately 138,000 fatalities and 400,000 disabilities reported annually, primarily impacting impoverished rural communities in low- and middle-income countries. The World Health Organization aims to halve this burden by 2030, yet the increasing overlap of snake habitats with human populations complicates these efforts.
Human factors exacerbate the situation. Workers in agriculture, often lacking protective equipment, are at heightened risk of snake encounters. Additionally, extreme weather events that displace both snakes and humans can lead to a surge in snakebite incidents. The study emphasises the importance of strategically stockpiling antivenom and directing healthcare resources to the most at-risk communities.
Conservation Concerns Amidst Climate Crisis
Not all snake species will thrive in the face of climate change. The study predicts that many species in the Congo and Amazon basins, as well as Southeast Asia, may experience significant declines in their populations. The wide-ranging puff adder, a species responsible for numerous bites across Africa, is also expected to lose much of its current habitat.
The researchers stress that understanding these shifts in snake distribution is crucial for public health planning and conservation efforts. “Our predictions can be used to determine where to stockpile antivenom, how to enhance health facility capacities, and where to focus conservation initiatives for at-risk snake species,” they state.
Climate Emergency and Public Health Preparedness
The urgency of this research is underscored by the recent findings from the UN, which indicate that the global climate is in a state of emergency. The World Meteorological Organization has reported that the past eleven years were the hottest on record, with 2025 temperatures soaring approximately 1.43°C above pre-industrial levels. UN Secretary-General António Guterres has warned that every significant climate indicator is “flashing red”, attributing this crisis to humanity’s dependence on fossil fuels.
The study utilises a worst-case emissions scenario for its projections, arguing that preparing for the most severe outcomes provides the best framework for public health responses.
Why it Matters
As climate change continues to reshape ecosystems, the rising interaction between venomous snakes and human populations presents a pressing public health challenge. The potential for increased snakebite incidents poses a threat not only to individual safety but also to community health resources, particularly in vulnerable regions. This research serves as a critical call to action for governments, public health officials, and conservationists to develop comprehensive strategies that address both the growing prevalence of snakes in urban areas and the urgent need for public health preparedness in the face of a changing climate.
