This is What a Mass Die-off of Earth's Coral Reefs Looks Like

Earlier this week, we learned that Earth's coral reefs are in the midst of a massive dieoff , triggered by abnormally hot temperatures in ocean basins worldwide. It's hardly the first time in recent history that we've witnessed a widespread coral bleaching event, and it won't be the last. In several decades, coral reefs could literally be extinct -- a striking casualty of global climate change.