To Margulis, the Great Oxidation Event had lessons for today. The first was that people who thought that living creatures couldn’t affect the climate had no idea of the power of life. The second was that the onset of climate change meant that Homo sapiens was getting into the biological big leagues—we were tiptoeing into the terrain of bacteria, algae, and other truly important creatures. The third was that species, like sullen teenagers, don’t pick up after themselves. Cyanobacteria sprayed their oxygen garbage all over Earth without concern for the consequences—littering on an epic scale.
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