4 集
第 5 集。Asteroid Apocalypse

第 5 集。Asteroid Apocalypse
Many scientists now believe that a "killer asteroid" wiped out the dinosaurs and 70% of all living things 160-million years ago. How likely is it that a similar event can occur again?
45 分鐘
2006年5月8日
第 7 集。Yellowstone Eruption

第 7 集。Yellowstone Eruption
The world's largest, most active volcano system exists in the western US. 6,000 years ago, the Yellowstone Volcano erupted. Lava and pyroclastic flows covered 3,000-square miles with ash 3-feet thick. Fossils discovered as far away as Nebraska were found.
45 分鐘
2006年5月8日
第 12 集。Mega Freeze

第 12 集。Mega Freeze
Could North America and parts of Europe be headed for a "big chill?" Many experts fear that an abrupt climate change could have catastrophic effects across the planet, including devastating winters in some northern regions.
45 分鐘
2006年5月8日
第 13 集。California's Katrina

第 13 集。California's Katrina
The floods that destroyed so much of New Orleans after Hurricane Katrina showed how fragile levee systems can be. Now, experts believe a devastating flood could also strike Sacramento.
45 分鐘
2006年5月8日
















