Studies of ancient climates suggest Earth is now on a fast track to global warming

Human activities are releasing greenhouse gases more than 30 times faster than the rate of emissions that triggered a period of extreme global warming in the Earth's past, according to an expert on ancient climates.

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<p><a href="http://www.physorg.com/news10975.html">Studies of ancient climates suggest Earth is now on a fast track to global warming</a></p> <p>Human activities are releasing greenhouse gases more than 30 times faster than the rate of emissions that triggered a period of extreme global warming in the Earth's past, according to an expert on ancient climates.</p>