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I remember Carl Sagan going through this on Cosmos in the early 80's and being struck by the dramatic effect of including, as he so eloquently put it, the trap of the combination of technology and passions leading to the early end of civilizations.
I also recall an astronomer on the radio last year when asked whether there was intelligent life on other planets saying rather wisely that we should try to find intelligent life on Earth as a starting point.
Thanks for the posting Liz - and love his 70's hairstyle & clothes!
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