When Oxygen Almost Killed Life explores one of the strangest turning points in Earth’s history — a time when the very gas that keeps us alive nearly wiped out life on the planet. About 2.4 billion years ago, tiny ocean-dwelling microbes began releasing oxygen through photosynthesis, slowly transforming Earth’s atmosphere. For the anaerobic life that dominated the planet, this new “pollution” was deadly, triggering mass die-offs, rusting the oceans, and possibly plunging the world into a global ice age.

This episode tells the story of the Great Oxidation Event — a planetary crisis caused by microscopic life that ultimately made complex organisms, ecosystems, and human existence possible. It’s a reminder that the air we breathe today was once Earth’s most dangerous environmental change.

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