What If Earth Lost 1% of Oxygen Every Second?

You wouldn’t notice it at first. But every second, the air around you is thinning, little by little. After 30 seconds, you’re gasping. Engines fail. Hospitals go dark. By minute two, planes are crashing, oceans are suffocating, and the sky is turning deadly. If Earth started losing 1% of its oxygen every second, this is exactly how fast the world would end.

But how long would it take until we completely run out? Can anything survive in a zero oxygen world? And is there hope for humans to some day repopulate the Earth?

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