gwern comments on Open thread, November 2011 - Less Wrong

4 Post author: Oscar_Cunningham 02 November 2011 06:19PM

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Comment author: gwern 06 November 2011 05:02:03AM 3 points [-]

This was actually covered in a book I read (I think it was The World Without Us). Summary: even our reactors leave clear traces that will be detectable about as long as the mass extinction event we're causing. So a civilization and species-killing thermonuclear war would definitely be detectable by us.