CALI, Colombia—The United Nations, scientists and governments made an urgent call on Wednesday for increased funding to protect coral reefs under threat of extinction. Research this year shows that 77 percent of the world’s reefs are affected by bleaching, mainly due to warming ocean waters amid human-caused climate change. It's…

Coral reefs are vital ecosystems that support over 25% of marine life and nearly a billion people, many relying on reefs for food security, coastal protection and livelihoods, the U.N. development fund said

Research shows 77% of world’s reefs are affected by bleaching