Deadly heatwaves

Around a third of the world's population is currently exposed to deadly heat for 20 days or more a year, and without action to reduce greenhouse gas emissions the risk will increase substantially as the world warms, according to a study published in Nature Climate Change. Scientists from the UK and US reviewed papers published between 1980-2014, identifying 783 cases relating to heat deaths from 164 cities in 36 countries, and concluded that, by 2100, around three-quarters of humanity could be exposed to deadly temperatures, but large cuts to emissions could reduce the threat to around half. To find out more check out Global risk of deadly heat.