Apr 25, 2015

Q.1668

"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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This day last year: Q.1303

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