Extreme temperatures kill 5 million people a year with heat-related deaths rising, study finds

More than 5 million people die each year globally because of excessively hot or cold conditions, a 20-year study has found – and heat-related deaths are on the rise.

The study involving dozens of scientists around the world found that 9.4% of global deaths each year are attributable to heat or cold exposure, equivalent to 74 extra deaths per 100,000 people.

It’s prompted calls for better housing insulation and more solar-powered air conditioning, as well as warnings that climate change will increase temperature-linked deaths in the future.

Researchers analysed mortality and weather data from 750 locations in 43 countries between 2000 and 2019, and found the average daily temperature in these locations increased by 0.26C per decade.

The study found more people had died of cold than heat over the two-decade period. But heat-related deaths were increasing, while cold-linked deaths were dropping.

Monash University’s Prof Yuming Guo, one of the study’s lead researchers, said this trend would continue because of climate change, and total mortality rates may go up.

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