| http://www.w3.org/ns/prov#value | - ian period, 250 million years ago.United Nations scientists from the Intergovernmental Panel on Climate Change predict up to 6 degrees of warming for the next 100 years if nothing is done about emissions of greenhouse gases, principally carbon dioxide, the chief cause of global warming.The Permian mass extinction is now thought to have been caused by gigantic volcanic eruptions that triggered a ru
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