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<div style="background:#fff;border:#bbb dashed 1px;padding:5px"><a href="http://www.citatepedia.com/comments.php?id=126107" style="color:#000;text-decoration:none"><a href="http://www.citatepedia.com/comments.php?id=126107" style="color:#000;text-decoration:none">No civilization can possibly survive to an interstellar spacefaring phase unless it limits its numbers. Any society with a marked population explosion will be forced to devote all its energies and technological skills to feeding and caring for the population on its home planet. This is a very powerful conclusion and is in no way based on the idiosyncrasies of a particular civilization. On any planet, no matter what its biology or social system, an exponential increase in population will swallow every resource. Conversely, any civilization that engages in serious interstellar exploration and colonization must have exercised zero population growth or something very close to it for many generations.</a><br><br /></a><strong><a rel="author" href="http://authors.citatepedia.com/by.php?a=Carl+Sagan">Carl Sagan</a></strong> in <em><a href="http://sources.citatepedia.com/from.php?a=Carl+Sagan&d=Cosmos">Cosmos</a></em></div>

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