I find EurekAlert! : Is oxygen the cosmic key to alien technology? which notes:
So, how much is enough, and how common is this likely to occur among planets located in the so-called habitable zone?
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The levels of oxygen required to biologically sustain complex life and intelligence are not as high as the levels necessary for technology, so while a species might be able to emerge in a world without oxygen, it will not be able to become a technological species, according to the researchers.
“You might be able to get biology—you might even be able to get intelligent creatures—in a world that doesn’t have oxygen,” Frank says, “but without a ready source of fire, you’re never going to develop higher technology because higher technology requires fuel and melting.”
Enter the “oxygen bottleneck,” a term coined by the researchers to describe the critical threshold that separates worlds capable of fostering technological civilizations from those that fall short. That is, oxygen levels are a bottleneck that impedes the emergence of advanced technology.
So, how much is enough, and how common is this likely to occur among planets located in the so-called habitable zone?
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