"The Sixth ________: An unnatural history" won the 2015 Pulitzer Prize for General Non-Fiction. The book by Elizabeth Kolbert claims that we are currently in the middle of the 6th version of an event that results in a dramatic decrease in life on Earth (some of the previous 5 are Triassic-Jurassic and Late Devonian).
What word completes the title of this book, and what concept is this about?
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"Extinction", referring to Mass Extinction Events.
More details on the book.
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