Literally off the charts': global coral reef heat stress monitor forced to add new alerts as temperatures rise

We are entering a new world in terms of heat stress where the impacts are becoming so pervasive that we had to rethink how we were doing things, the Coral Reef Watch director, Dr Derek Manzello, told the Guardian.

Excessive heat can cause corals to separate from the tiny algae that give them their colour and much of their nutrients.

Read at www.theguardian.com