The tropical belt braces for unprecedented heat this summer, with conditions ripe for new records in temperature and humidity. This forecast, based on new research from the University of California, Berkeley, underscores the escalating impact of climate change coupled with an intense El Niño. Why humidity makes heat dangerous Our bodies rely heavily on sweating to stay cool. When sweat evaporates from our skin, it carries heat away with it, lowering our internal temperature. However, in high humidity, the air is already heavily laden with water vapor....