Climate Change Mystery: 'Snowball Earth' 440 Million Years Ago

By the time it ended, 75 percent of the world's marine organisms were extinct. But very slowly the planet began to warm, gradually eroding the mega-continent of ice around the South Pole, and many of the tiny creatures and plants that had died out were replaced by new organisms. Life began anew on planet Earth. It happened, not because of a cataclysmic impact by a foreign body, like the one believed to have wiped out the dinosaurs. It happened simply because the planet's climate began to...Full Story
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