A fascinating history of species extinctions, their causes and the looming "sixth extinction".
It is the central issue for this generation. Respected journals and popular publications worldwide pose the question, call the warning: "Are we in the middle of a sixth mass extinction?" (Science), "Multitude of species face climate threat" (The New York Times), "The sixth great extinction: a silent extermination" (National Geographic).
Of the 1-3 billion species estimated to have appeared during Earth's history, only 12.5 million exist today. Geologists know that species extinction is as natural a process as species evolution. They also know that the rate of.
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