22. Large Hadron Collider - scientists tinkering with something they think they understand the risks of, but what if there's a 0.000001% chance their black hole calculations are wrong? Is it worth the risk? Originally we were told by CERN scientists that it was impossible for a black hole (that might gobble up the entire planet) to be created by the LHC, because it "would decay before it had the chance to do any damage". This has recently been updated to "the growth of black holes to catastrophic size does not seem possible.”
21. Solar System Falls Apart (butterfly effect) - to the best of our knowledge, everything is OK for a long, long time. However simulations have shown how Mercury could cause Earth and Mars to collide a few billion years from now. But throw a stray comet or Planet X into the mix, and our solar system could turn into a catastrophic pinball machine any old time.
20. Ice Age - right now the buzz is about "global warming", yet a mere thirty years ago we were worried about an impending Ice Age. There is evidence that parts of our climate system work more like a switch than a dial, and if a certain level of temperature is reached, it may cause what is known as "abrupt climate change". See the movie "The Day After Tomorrow" for how it might work.
19. Nuclear Accident - nothing is foolproof. We've had such accidents in the past, and a bigger accident is totally possible. Hard for the ancients to predict, though.
18. Genetic Modification - we blindly take vaccinations, and we might be sheep when it comes to "gene therapy" as well. Our desire to live longer might just be our undoing.
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