With tsunamis, earthquakes, and financial concerns dominating headline news, National Geographic initiated a survey about what Americans' think about a potential "Doomsday scenario. Here are some of the key findings:

• More than 62 percent of Americans think the world will experience a major catastrophe in the next 20 years.
• The four most likely disaster scenarios include (in order) a significant earthquake, a significant hurricane, a terrorist attack, a financial collapse.
• 71 percent envision a major disaster in their lifetime as an "act of God, not man."
• 85 percent said they are not ready for a devastating event; 25 percent claim they've done absolutely nothing to prepare for a major disaster.
• When asked what people would do the night before they thought the world might end, these were the three highest answers—Resolve feuds with loved ones (27 percent), Have sex (24 percent), and Stock up on resources (20 percent).