Rising Heat Brings Snakes Closer to People

The risk of snakebites is rising around the world. Reptiles are moving to new areas to escape rising temperatures. They are also moving to avoid the expansion of human settlements. A major study led by the World Health Organization confirms that venomous snakes are coming into greater contact with people. This trend is driven by climate disruption and changes in land use.

Snakes from every continent are affected. In Africa, spitting cobras are moving to cooler spots. In Europe and South America, vipers are shifting their locations. In North America, cottonmouth moccasins are expanding their range. In Asia, kraits are changing their habitats. These reptiles are adapting to hotter conditions. Scientists expect this trend to become more severe in the coming decades.

“The overlap between humans and venomous snakes will be greater,” said David Williams. He works with the WHO and the University of Melbourne. He described the risk simply. A person could walk out of their back door and stumble, getting bitten in the process. This illustrates how close these encounters can become in everyday life.

Snakebite statistics are difficult to track. Many bites occur in remote areas and go unreported. However, the new paper estimates about four million cases each year. Most of these happen in tropical regions. While the vast majority of bites are not dangerous, the consequences can be severe. There are approximately 138,000 deaths and 400,000 disabilities annually. Almost half of these occur in South Asia.

Until now, researchers understood the risk of snakebites at a local or national level. There was little analysis of how this risk might change in the future. Climate trends and demographic shifts were not fully integrated into these predictions. The new study aims to fill this knowledge gap. It provides a clearer picture of the global threat.