Majority of coral reefs examined suffer from low oxygen levels, study says

March 16 (UPI) -- A vast majority of 32 coral reefs examined around the world are suffering from low oxygen levels because of global warming, and the threat to marine ecosystems is expected to get worse, according to a study published Thursday. The new research is documented in the journal Nature Climate Change, and its authors said this is the first time the current state of low oxygen, or hypoxia, was explored around the world. The authors, led by researchers …