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Under a Green Sky: Global Warming, the Mass Extinctions of the Past, and What They Can Tell Us about Our Future Hippocrene Concise Dictionaries and Secret Cow Levels continuesMore than 200 million years ago, a cataclysmic event known as the Permian extinction destroyed more than 90% of all species and nearly 97% of all living things. Its origins have long been a puzzle for paleontologists, and during the 1990s and the early part of this century a great battle was fought between those who thought that death had come from above and those who thought something more complicated was at work. Paleontologist Peter D. Ward, fresh