A quarter of all marine life relies on coral reefs for survival, yet we have lost over half of our reefs in just thirty years. Thanks to a promising coral reef restoration initiative, hope is not lost. Discover more. | National Geographic History

281K views · 3.9K reactions | Earth’s history includes five major mass extinctions, with up to 95% of species lost in events driven by impacts, volcanic eruptions, or potentially solar outbursts. The terminal Pleistocene extinction, though not part of the “Great Five,” saw the disappearance of North America’s megafauna, focusing on top predators and large mammals. | The Randall Carlson | Facebook