Many of World's Coral Reefs Turn White in Global Bleaching;54 Countries Have Had Bleaching Reefs as Climate Change Warms Ocean Waters

 Along coastlines from Australia to Kenya to Mexico, many of the world's colorful coral reefs have turned a ghostly white in what scientists said this week amounted to the fourth global bleaching event in the last three decades, the Reuters website reports today (April 17, 2024). 

At least 54 countries and territories have experienced mass bleaching among their reefs since February 2023 as climate change warms the ocean's surface waters, according to the U.S.National Oceanic Atmospheric Administration's (NOAA) Coral Reef Watch, the world's top coral reef monitoring body. 

Bleaching is triggered by water temperature anomalities that cause corals to expel the colorful algae living in their tissues. Without the algaes'  help in delivering nutrients to the corale, the corals cannot survive.

"More than 54% of the reef areas in the global ocean are experiencing bleaching--level heat stress," Coral Reef Watch coordinator Derek Manzello said. 

Announcement of the latest global bleaching event was made jointly by NOAA and the International Coral Reef Initiative (ICRI), a global intergovernmental conservation partnership. For an event to be deemed global, significant bleaching must occur in all three ocean basins --  the Atlantic, Pacific. and Indian -- within a 365--day period.