North Pole's ancient past holds clues about future global warming

A treasure trove of scientific data is revealing detailed information about conditions of subtropical warmth at the North Pole about 55 million years ago while also providing a window into the future, when greenhouse gases are expected to reach the same levels that caused Earth's ancient heat wave.

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<p><a href="http://www.physorg.com/news68305951.html">North Pole's ancient past holds clues about future global warming</a></p> <p>A treasure trove of scientific data is revealing detailed information about conditions of subtropical warmth at the North Pole about 55 million years ago while also providing a window into the future, when greenhouse gases are expected to reach the same levels that caused Earth's ancient heat wave.</p>