Via Instapundit:
Generally the extinction effects have to be so rapid that their is no time to mitigate or adapt. Space based phenomena like massive asteroid or a nearby gamma ray burster are the kind of situation that we currently could not handle. This is why there is need to stop pissing around with penny ante crap and get serious about moving civilization to full Kardashev level II. At that level there is no known threat other than all out super-war that would be a risk to such a civilization. Even things like the sun going nova could be detected and handled as such a civilization would have its own highly efficient nuclear fusion and other power sources. – Next Big Future
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