title: The sixth extinction? There have been five great die-offs in history. This time, the cataclysm is us.
authors: Elizabeth
authors: E
authors: Kolbert
mesh_terms: D000818:Animals; D001001:Anura; D005075:Biological Evolution; D004463:Ecology / Q000266:history; D004777:Environment; D053476:Extinction, Biological; D049673:History, 20th Century; D049674:History, 21st Century; D049690:History, Ancient; D010176:Panama