The changes were described as stark, such as rise in heatwaves across the Mediterranean.
For example, between 1950 and 2017, the Mediterranean saw heatwaves extend by two days per decade.
However, between 1980 and 2017, the trend has accelerated to about 6.4 days per decade.
The study has also found these changes vary across different parts of the world.
Regions like the Amazon in northeast Brazil, West Asia and the Mediterranean are experiences rapid changes in heatwave trends.
But regions like South Australia and North Asia are seeing changes at a slower rate.