Bleached coral occurs when extreme temperatures, increased UV rays, disease, chemicals, silinity and exposure to air and rain at extreme low tides occur - Great Barrier Reef, Queensland [Getty Images]

Bleached coral occurs when extreme temperatures, increased UV rays, disease, chemicals, silinity and exposure to air and rain at extreme low tides occur - Great Barrier Reef, Queensland — see more

Bleached coral occurs when extreme temperatures, increased UV rays, disease, chemicals, silinity and exposure to air and rain at extreme low tides occur - Great Barrier Reef, Queensland