What’s behind the 3 near-misses in space?

What’s behind the 3 near-misses in space, the impact in Russia, the fly-by over San Francisco, and the near miss by asteroid 2012 DA14? And what can be done about these near-misses? Will we be hit in the future?
Guest:
Dr. Peter Ward, author of The Flooded Earth, about the threat of rising sea levels.


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