For two billion years, Earth was nothing but single-celled bacteria. No complex life. No animals. No us. Then something happened exactly once in our planet's history that changed everything: photosynthesis. Terry Adair explains how a single chemical equation — six CO2s plus six waters plus light — terraformed the entire planet, oxygenated the atmosphere, killed off most of the existing organisms, and unlocked the surplus energy that made the Cambrian explosion possible. Every complex thing alive on Earth today exists because of one ancient invention. And if a planet never develops photosynthesis or some analog of it, complex life never gets there. Ever.
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