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  1. Some percentage of the decrease in “time to 50 million” is that the world – or rather the population – is getting larger right? The population was like a quarter the size when airplanes and cars came out.

    And of course, it could be “getting smaller” in a negative sense that most of the stuff at the end of the spectrum- youtube, say – is a lot less of an impact or infrastructure than the car or electricity….

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