752K views · 1.8K reactions | A quarter of all marine life relies on coral reefs for survival, yet over half of our reefs have died in just thirty years—but hope is not lost. Find out why. | National Geographic History | Facebook

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