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Popular science writer and paleontologist Ward presents breaking news about the link between past mass extinctions and global warming. Disarmingly engaging, Ward combines tales of his own punishing fieldwork with a piquant history of the controversies that have dogged scientists seeking the cause of the "mother of all extinctions" in the Permian period. This provides the foundation for a stunning discovery: evidence of past greenhouse extinctions. As Ward carefully parses the data and its implications, he observes, "the key to climate change seems to be both the level and the rate at which carbon dioxide rises in the atmosphere," no matter its source. Ward also illuminates the symbiosis between ocean currents and climate change, then explains why, as the northern ice cap melts, it is likely that the Atlantic conveyor current system will be altered, thus accelerating climate change. Ward asserts that humankind has flourished during a remarkable period of climatic stability and notes how tragic it will be if our carbon habit brings this boon to a catastrophic end. An important addition to the necessary literature of global warming. Donna Seaman
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Product Description
By looking backward at the course of great extinctions, a paleontologist sees what the future holds.
More than 200 million years ago, a cataclysmic event known as the Permian extinction destroyed more than 90 percent of all species and nearly 97 percent of all living things. Its origins have long been a puzzle for paleontologists. 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 from helping prove that an asteroid had killed the dinosaurs, turned to the Permian problem, and he has come to a stunning conclusion. In his investigations of the fates of several groups of mollusks during that extinction and others, he discovered that the near-total devastation at the end of the Permian period was caused by rising levels of carbon dioxide leading to climate change. But it's not the heat (nor the humidity) that's directly responsible for the extinctions, and the story of the discovery of what is responsible makes for a fascinating, globe-spanning adventure.
In Under a Green Sky, Ward explains how the Permian extinction as well as four others happened, and describes the freakish oceans—belching poisonous gas—and sky—slightly green and always hazy—that would have attended them. Those ancient upheavals demonstrate that the threat of climate change cannot be ignored, lest the world's life today—ourselves included—face the same dire fate that has overwhelmed our planet several times before.
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