Denise Chow is a reporter for NBC News Science focused on general science and climate change.
The world’s oceans have gone “crazy haywire,” according to a National Oceanic and Atmospheric Administration official, with record-high temperatures imperiling coral reefs. Derek Manzello, coordinator of NOAA’s Coral Reef Watch Program, said in a news briefing Thursday that around 60.5%, or nearly two-thirds, of the world’s coral reefs have experienced heat stress at levels high enough to cause bleaching, a major health threat.
“For an Alert Level 5, we are estimating that approximately 80% or more of corals on a particular reef may die,” he said. “This is analogous to a Category 5 hurricane or cyclone.” Daily monitoring of ocean conditions around the world, released by NOAA’s Coral Reef Watch, shows zones of Bleaching Alert Level 4 in the central Pacific Ocean and off the Atlantic coast of South America, with some ribbons of Alert Level 5 in the southern Atlantic.
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