Unless greenhouse gas emissions are cut, earth will soon be at its hottest in 34 million years : study

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Researchers from the University of Bremen, Germany, analysed sediments drilled from the bottom of the ocean. These sediments contain the shells of tiny organisms, and can be used to get a fix on the ambient temperature at that time.

Without the industrial revolution such temperatures could have only been reached in thousands of years.

Scientific American story : Earth Hasn’t Warmed This Fast in Tens of Millions of Years

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