The number of hot days doubles, where temperatures reach 50 degrees. Warning of scientists
The number of extremely hot days each year when temperatures reach 50 C has doubled since 1980, a BBC global analysis has found.
They also occur now in more areas of the world than before, posing unprecedented challenges to human health and the way we live.
The total number of days above 50C (122F) has increased in every decade since 1980. On average, between 1980 and 2009, temperatures exceeded 50C about 14 days a year.
The number increased to 26 days a year between 2010 and 2019.
In the same period, temperatures of 45C and above occurred on average two additional weeks per year.
"The increase can be attributed to 100% burning of fossil fuels," says Dr Friederike Otto, associate director of the Institute for Environmental Change at Oxford University.
High heat can be deadly to humans and nature, and cause major problems in buildings, roads and energy systems.
Temperatures of 50 ° C occur mainly in the Middle East and Gulf regions.
And after record temperatures of 48.8C in Italy and 49.6C in Canada this summer, scientists have warned that days above 50C will occur elsewhere if we do not reduce fossil fuel emissions.
"We need to act fast. The sooner we reduce our emissions, the better we will all be, " says Dr Sihan Li, a climate researcher at the School of Geography and Environment at Oxford University.