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Dead matter taking over Melbourne

In the Beginning …
Earth’s atmosphere was unbreathable to humans. But that was okay, since there were no humans. Photosynthesising cyanobacteria used sunlight to convert carbon dioxide and water into food, incidentally producing oxygen. The many microbially-mediated rocks (stromatolites) the bacteria left behind from their halcyon days indicate a cyanobacteria population explosion so vast that it seems likely that simple metabolism accidentally transformed the atmosphere to the one we love and overuse today. This ‘oxygen holocaust’ probably also brought about the fossil status of our inadvertent benefactors around 2.5 billion years ago.

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