Over the last half-billion years, there have been five major mass extinctions. The last of these, caused by an asteroid impact, did in the dinosaurs. Scientists now say we are on the verge of a sixth extinction. This time the cause is us. How are humans driving a mass extinction and what can be done?
Elizabeth Kolbert is an American journalist and author. She is best known for her Pulitzer Prize-winning book, The Sixth Extinction: An Unnatural History, and as an observer and commentator on environmentalism for The New Yorker magazine. She resides in Williamstown, Massachusetts.