http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html PBS - Evolution (series) 'The Current Mass Extinction' out of existence http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html We are practically as efficient as a bolide impact! http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html mass extinction http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html out of existence http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html mass extinction http://www.pbs.org/wgbh/evolut.....32_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html approximately as long as the average species http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html high rates of wildlife extinction http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html one million years extinction occurring now http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html la extinción actual de especies http://www.pbs.org/wgbh/evolut.....32_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html PBS - Evolution (series) 'The Current Mass Extinction' extinction occurring now http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html at record rates help you out http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html The Current Mass Extinction (PBS) extinción que está ocurriendo ahora mismo http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html 300 times out of existence http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html one million years http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html out of existence http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html extinción continua extinction occurring now http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html The Current Mass Extinction http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html anthropogenic extinction http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html PBS: The Current Mass Extinction extinction occurring now The background level http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html one million years http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html more than 27,000 species http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html one million years 300 times http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html extinction occurring now http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html help you out faster than they did when the dinosaurs died off http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html out of existence http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html 300 times http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html out of existence http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html Evolution--The Current Mass Extinction. http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html PBS - Evolution (series) 'The Current Mass Extinction' The Current Mass Extinction (PBS) http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolut.....32_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html faster than they did when the dinosaurs died off http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html mass extinction http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html mass extinction pbs.org/wgbh/evolution/library/03/2/l_032_04 diversity http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html http://www.pbs.org/wgbh/evolution/library/03/2/l_032_04.html