Giant volcano at Yellowstone erupts on schedule. The last eruption covered about 20 states with ash. If Yellowstone blows, think big: Think REALLY BIG!

Gas hydrates under the ocean may contain an almost unlimited supply of energy, but they’re hard to get, and using them could make global warming even worse. Now a UC-Riverside professor says quick releases of frozen methane could cause a climate catastrophe. So is this gas a blessing, a curse, or both?

As coastal populations continue rising around the world, we wonder about the history of tsunami assaults on humans. What causes these titanic waves, and what can we do to reduce their deadly impact?As coastal populations continue rising around the world, we wonder about the history of tsunami assaults on humans.