Average global temperatures have risen by 0.3 degrees Celsius since 2015, adding 11 extra hot days each year. A new study by World Weather Attribution and Climate Central has found that pledges made under the 2015 Paris Agreement to cut CO2 emissions could halve the number of extreme heat days projected by 2100 — if fully implemented.

Heat remains the deadliest form of extreme weather, responsible for about half a million deaths each year. Yet only half of all countries have early warning systems in place.