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Causes of Global Warming

Papers
  1. Study: Arctic Was Once Tropical (Washington Times)
      "First-of-its-kind core samples dug up from deep beneath the Arctic Ocean floor show that 55 million years ago an area near the North Pole was practically a subtropical paradise, three new studies show."

      "Millions of years ago the Earth experienced an extended period of natural global warming. But about 55 million years ago there was a sudden supercharged spike of carbon dioxide that accelerated the greenhouse effect."

      "Scientists already knew this 'thermal event' happened but are not sure what caused it. Perhaps massive releases of methane from the ocean, the continent-sized burning of trees, numerous volcanic eruptions." 05-06

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