What is Coral Bleaching and how does it impact the Great Barrier Reef?

When we talk about the conservation of the Great Barrier Reef there is often mention of coral bleaching, but do you know what coral bleaching actually is?

Half of Great Barrier Reef Died — What Happens If All Coral Reefs Die

Coral bleaching - Great Barrier Reef Foundation

Great Barrier Reef suffers widespread coral bleaching

Interactive: Can the Great Barrier Reef survive climate change?

ESA - Sentinel-2 captures coral bleaching of Great Barrier Reef

The Great Barrier Reef and the Battle Against Coral Bleaching

Two Caribbean Reefs Gravely Distressed from Coral Bleaching and Climate Change - Coral Reef Alliance

Coral Bleaching - Great Barrier Reef Foundation

Only 7% of the Great Barrier Reef has avoided cor - Apr 2016 - JCU Australia

Everything You Need to Know about Coral Bleaching—And How We Can Stop It, Pages