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736 pages, Hardcover
First published October 1, 2004
In fact, it is estimated that 99% of all bird species that have ever lived on earth are now extinct. So, why should we be concerned about bird species becoming extinct today?
The answer is simple: the wave of extinction currently underway is occurring at a pace and scale fully comparable to the five greatest extinction episodes in the earth's history, but this sixth mass extinction is directly caused by human activities across the globe. The physical and biological changes humans have caused on earth are so profound and widespread that a new expression -- the Anthropocene -- has been coined to describe this epoch in geological terms. The worldwide spread of modern Homo sapiens has resulted in the extinction of about 8000 species of landbirds, according to recent estimates based on fossil deposits. Most biologists agree that human-caused extinction now rival those associated with the events that extinguished the dinosaurs about 65 million years ago.