Rapid Magnetic Changes / Houston Dome / Another Tunguska
“a new study of ancient copper mines in southern Israel found that the strength of the magnetic field could double and then fall back down in less than 20 years.” This could be local, or global, they don’t seem sure. But it is certainly something scientists previously did not believe possible.
Why build bunkers when you can protect an entire city with a massive dome?

The concept would supposedly keep the city safe from a category-5 hurricane.
Tunguska was not the only explosion of its type last century – there’s actually a list of them at Wikipedia. A good candidate to add to that list is a powerful blast that struck British Guyana in 1935. An expedition “reported seeing an area some miles across where the trees had been broken off about 25 feet above their bases“, while numerous people witnessed a “large meteoroid/small asteroid entry“. One day a town or city will be the victim, and we can’t stop it. Hopefully 2012 will not be a time where these events become commonplace.