NASA plans to save the Earth from approaching asteriods by nuking them. Given an advance warning 2 years earlier, they can deflect asteroids of the size 100m-500m. They can also deflect larger asteroids given 5 years warning. Whether this really works out or not, only time will tell.
http://www.flightglobal.com/articles/2007/08/03/215924/nasa-plans-armageddon-spacecraft-to-blast-asteroid.html
NASA plans to bombard approaching asteroids with nukes
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