Extreme heat puts stress on everyone's bodies. In recent years, scientists and policymakers have homed in on the risks heat poses to older people, whose bodies become more sensitive to heat with increasing age.
But a new study in the journal Science Advances suggests that there is another group at risk, and one that gets less attention.
"Young people are disproportionately vulnerable to heat," says Andrew Wilson, an environmental scientist at Stanford University and an author of the new analysis.
The study, which focused on Mexico, found that people under 35 made up three-quarters of the country's deaths related to heat in recent decades, with risks concentrated amongst children under 4 years old and young adults from 18 to 35. That percentage is likely to increase in the future as human-caused climate change intensifies the number of sticky, humid heat days in the country.