Remember that you still need to explain the Fermi paradox [1]. If you apply the above logic to life & civilizations in general, you conclude that it's actually

Remember that you still need to explain the Fermi paradox [1]. If you apply the above logic to life & civilizations in general, you conclude that it's actually quite likely for them to survive long enough and become widespread. Yet, our experience contradicts that assertion, for we don't know any other race at even comparable level of technical development Of course, this (i.e. civilization quickly become extinct) is just one possible resolution to the paradox, but the arguably simplest one. If the actual reason(s) we don't see advanced life are different, the Great filter hypothesis holds less water. We don't know that yet, though. [1] http://en.wikipedia.org/wiki/Fermi_paradox http://en.wikipedia.org/wiki/Fermi_paradox