Almost all coral reef ecosystems face risk of collapse in 50 years, study warns

The world’s coral reef ecosystems almost all face a high risk of collapse in the next 50 years, mostly due to warming oceans and heat waves, according to a global assessment released Thursday. It’s the latest dose of bad news for coral reefs, which are critical sources for seafood and tourism and often serve as buffers from coastal erosion and storms. Sometimes dubbed “rainforests of the sea,”…