The current summer in the Northern Hemisphere has been so hot, with temperatures reaching record highs—including in the sea—that discussions are already revolving around the limits of human survival. Even in Antarctica, sea ice has failed to reform, a drastic departure from normal winter patterns. It is not just an impression that extreme heat events are occurring more frequently. As a result of climate change, the frequency of these events has increased—and is expected to worsen.

In fact, in most years, heat is the most lethal weather phenomenon, killing an average of 490,000 people worldwide and causing serious health problems for many others. According to the World Health Organization, heat-related deaths are projected to increase by 50% by 2050. However, this impact is not distributed equally, either globally or within communities: populations already living in more vulnerable conditions face the greatest risks.