The northern part of the world is generally warmer than it has been at any time in the last 1,200 years, according to research.
Studies of fossil shells, tree rings, ice cores and ancient temperature records show the last part of the 20th Century was the warmest since 800AD.
Scientists even looked at people's diaries over the last 750 years to find out how the weather has changed.
The results of the study support the idea that the world is getting warmer.
Evidence
Scientists examined the rings in the trunks of long life evergreen trees growing in Scandinavia, Siberia and Canada to reveal temperature changes.
Wider rings showed warmer periods, narrow rings suggested colder times.
Researchers at the University of East Anglia also read diaries of people living in the Netherlands and Belgium to find out when canals in that area had frozen over.
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