More from KUOW Arts & Life How Humans Are Contributing To The Sixth Extinction KUOW | By Amina Al-Sadi Published March 6, 2014 at 3:26 PM AKST Twitter LinkedIn Email Listen • 12:24 Elizabeth Kolbert's book "The Sixth Extinction." Steve Scher talks with New Yorker writer Elizabeth Kolbert about her book "The Sixth Extinction: An Unnatural History."