Rising temperatures linked to climate change are projected to drive millions into physical inactivity by 2050, with hundreds of thousands of deaths expected worldwide, according to new research.

The study, published in The Lancet Global Health on Monday, found that climate change is worsening physical inactivity, a trend that could lead to hundreds of thousands of premature deaths worldwide by 2050.

The researchers analyzed data from 156 countries from 2000 to 2022, and used the findings to project trends for the coming decades.

The findings suggested that by 2050, each additional month with average temperatures above 27.8C (82.04F) could raise global physical inactivity by 1.5%.

This could result in an estimated 470,000 to 700,000 additional premature deaths annually, along with up to $3.68 billion in productivity losses.

“Without stronger mitigation, rising temperatures alone could undermine—or even reverse—a substantial share of WHO’s target of cutting global physical inactivity by 15% by 2030,” the study said, adding that it could also slow economic growth due to heat-related declines in worker productivity.

Prioritizing heat-adaptive urban design, subsidized climate-controlled exercise facilities, and targeted heat-risk communication is essential to mitigate these emerging health and economic burdens, in addition to ambitious emissions reductions, the study added.