Commentary: A giant volcano could end human life on Earth as we know it

(National Park Service via AP) This recent but undated photo provided by the National Park Service shows Ledge Geyser in Yellowstone National Park, within days of its most recent eruption that began on April 28, 2019. The noisy geyser in Yellowstone has roared back to life after three years of quiet. Ledge Geyser is one of the biggest in Yellowstone's Norris Geyser Basin.