![]() ![]() New Yorker staff writer Kolbert ( Field Notes from a Catastrophe: Man, Nature, and Climate Change, 2006, etc.) returns with a deft examination of the startling losses of the sixth mass extinction occurring at this moment and the sobering, underlying cause: humans.Īlthough “background extinction” continuously occurs in varying slow rates among species, five major mass extinctions mark the past. Scientists theorize that all of these-from the extinction of the Ordovician period, which was caused by glaciation, to the end of the Cretaceous, caused by the impact of a celestial body on the Earth’s surface-were the results of natural phenomena. Today, however, countless species are being wiped out due to human impact. ![]()
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