More than 40% of children under the age of 10 globally are already experiencing at least 20 additional “heat-stress days” due to climate change.

This is according to a new attribution study, published in Science Advances, which combines climate models with demographic data to assess the age groups and regions that are exposed to the most hot, humid days.

The study finds that children up to the age of nine already face more additional heat-stress days globally as a result of climate change than any other age group.