This should really be one of the last things on the agenda that we have to protect people from.
It would require a 10 km wide asteroid to wipe out a significant portion of the world's population. The chances of one this size colliding with us have it occurring once every 100 million years. I like those chances.
Waiting 50 years for techonology to develop a little more before worrying about this problem means waiting only 0.0000005% of that time period.
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