Climate change is set to push venomous snake species from their arid habitats towards densely populated coastal regions, significantly escalating the risk of human encounters, according to a groundbreaking study published in PLOS Neglected Tropical Diseases. This research underscores the urgent need for public health preparations as snake populations adapt to rising global temperatures, creating a precarious situation for millions of people.
Venomous Snakes on the Move
The study, which models the distribution of all 508 medically significant venomous snake species, predicts a dramatic shift in their habitats by the years 2050 and 2090. As temperatures rise, many snakes will abandon their current arid environments, gravitating towards more populated coastal areas, particularly along Australia’s east coast. This movement is alarming, as it not only poses a direct threat to nearby communities but also highlights the pressing issue of snakebites, which currently claim approximately 138,000 lives annually and leave another 400,000 individuals with disabilities.
The research team noted that prior to this study, knowledge of the distribution of these medically important snakes was surprisingly limited. “A big reason snakebite is considered a ‘neglected’ tropical disease is that we know so little about exactly how many people get bitten and where, despite the enormous burden these bites cause in many countries,” they stated.
Regions at Risk
The findings indicate that the most significant overlaps between human populations and snake habitats exist in Sub-Saharan Africa, South Asia, and Southeast Asia—regions that already bear the brunt of snakebite incidents. Projections suggest that these overlaps will intensify, particularly across the Indian subcontinent, eastern North America, and parts of China, as the climate continues to warm.
Four snake species are highlighted as having the highest predicted increases in human exposure by 2090: the black-necked spitting cobra, the many-banded krait, the cottonmouth, and the copperhead. This shift could lead to a surge in snakebite incidents, necessitating immediate action to safeguard vulnerable communities.
The Need for Preparedness
The study’s projections rely on a comprehensive analysis that combines data from numerous sources, including citizen science platforms, museum records, and expert observations. This meticulous approach allows for a detailed understanding of how snake populations will react to climate change, offering crucial insights for public health officials and conservationists alike.
Anticipating these changes is vital. “Our predictions can be used to decide where to stockpile which antivenom, how to ensure adequate capacity of individual health facilities, how to improve healthcare accessibility for remote at-risk communities, and where to focus conservation efforts for threatened snake species,” the researchers emphasised.
The World Health Organization aims to cut the global burden of snakebites by 50 per cent by 2030, making it imperative to understand where these encounters are most likely to occur as habitats shift.
Conservation Challenges Ahead
While some snake species will migrate towards human populations, others may face significant range reductions. Species in the Congo and Amazon basins, as well as parts of Southeast Asia, are predicted to lose substantial territory, raising serious conservation concerns. Notably, the puff adder, a major contributor to snakebite incidents across Africa, is also expected to see a contraction in its range.
The implications of these changes are compounded by the broader climate crisis. Recent reports from the United Nations reveal that the global climate system is in a state of emergency, with the past decade witnessing unprecedented temperature rises. The World Meteorological Organization reported that the years 2015 to 2025 were the hottest on record, with 2025 temperatures projected to be approximately 1.43°C above pre-industrial levels.
Why it Matters
As climate change drives venomous snakes towards human populations, the intersection of public health and environmental science becomes increasingly critical. With the potential for rising snakebite incidences, especially in regions already burdened by poverty and inadequate healthcare, proactive measures are essential. Effective planning, resource allocation, and community education are necessary to mitigate the risks associated with this alarming trend, ensuring that vulnerable populations are safeguarded against the dangers posed by these increasingly mobile reptiles.
