When Yellowstone Explodes

This article states that the area of Yellowstone Park has exploded many times in the past producing continent-wide and worldwide effects. One explosion about 70,000 years ago came close to wiping out the human race. An expert is quoted as saying that just maybe another such eruption will not happen again.

Source:
http://ngm.nationalgeographic.com/2009/08/yellowstone/achenbach-text

Summary by:
Alan Detwiler, author of Thrivers In An Uncertain Future; bio at
www.smashwords.com/profile/view/alandetwiler