It's not normal, a new study says of the current global warming period.
World at its warmest of past 1,200 years, researchers showTree rings and seashells help reveal unusual climate of last half century
In November, Science published a paper showing atmospheric levels of the greenhouse gases carbon dioxide and methane are higher now than at any time in the past 650,000 yearsOur results show that, during the late 20th century, warming affected the entire northern hemisphere and that at no point in the past 1,000 years has the northern hemisphere experienced the same widespread warming," Dr Osborn said.
The study showed that the medieval warm period ran from about 890 to 1170 and that this was later followed by a significant period of cooling between 1580 and 1850, which included the period known as the "little ice age" when frost fairs were held on the River Thames.
"The key conclusion was that the 20th century stands out as having unusually widespread warmth, compared to all of the natural warming and cooling episodes during the past 1,200 years," Dr Osborn said.
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