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.

Coral bleaching occurs as a result of abnormal ocean…