Earth may seem perfectly designed for life, but beneath the surface lies a world of terrifying possibilities. From the unimaginable depths of the oceans to a planet without oxygen, from Earth’s ancient past to a future without humanity, how fragile is the world we call home? Enjoying this video? Dive even deeper into the world of science and discovery with Popular Science, the free streaming channel bringing you more of what you love from What If, plus epic explorations in engineering, rocket launches, movies, space, and Earth sciences underknown.com/popularscience 00:00 - How Is Earth So Suspiciously Perfect For Life? 18:29 - The Insane Scale of the Ocean Explained 41:11 - What If Earth Lost 1% of Its Oxygen Every Second Starting Now? 1:00:17 - What If Earth Became a Water World? 1:15:45 - The Entire History of Earth Condensed into 27 Minutes 1:39:28 - If All Humans Vanished, How Long Until Earth Erased Every Trace Of Us? Support us on Patreon: patreon.com/what...