Stressed out: how to measure dangerous heat

In the hottest year on record, with scorching conditions claiming lives from India to Mexico and Greece sweltering in its earliest-ever heat wave, experts are sounding the alarm over heat stress.

Summer in the city: Climate science reveals the impacts of heat

The summer sun beats down. People without air conditioning must find refuge in schools and community centers. Outdoor workers struggle to keep cool. Hot nights interrupt people's sleep, not allowing them to get the rest needed ...