This is sometimes called the Fermi Paradox. It's an old conundrum (which may have started with physicist Enrico Fermi) that asks "If space-traveling ETs exist, why aren't they with us already?"
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Their answer to the Fermi Dilemma is simple. Civilizations, even extraterrestrial ones, can't grow without limits. Instead of using the question the Fermi Paradox raises to infer that we are the only intelligent species in the galaxy, Haqq-Misra & Baum use it to infer that these civilizations have learned a lesson which we are just starting to grasp. You have to pace yourself. You have to live within your means. Exponential growth is not likely to be sustainable.
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