A team of scientists have raised questions about current scientific theories about global warming. They showed there was a similar pattern of "global warming" during medieval times and that the planet cooled down after that leading to a "mini ice age."

The group of scientists from the Syracuse University in New York state, led by geochemist Zunli Lu, found that the period known as the "Medieval Warm Period" occurred about 500 to 1,000 years ago and was not limited only to Europe as previously thought, but covered almost the entire world, including the Antarctica.The significance of their work, as Daily Mail points out, is that the world has experienced global warming in the past, even in the absence of the current CO2 emissions that many scientists have blamed for the current pattern of global warming.

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