Ashley Cooper / Woman taking polar plunge in 2 degrees C water off an Antarctic cruise ship into sea. Antarctic Peninsula, Antarctica. February 2019.

Georgette Douwma / Bleached coral {Acropora sp} caused by loss of algae with living purple polyps. Maldives.

Peter Scoones / Bleached {Acropora sp} coral caused by loss of algae due to temperature change. Maldives.

Chris Newbert / Stony Coral (Acropora sp) and baitfish, Solomon Islands

Fred Bavendam / Stony Coral (Acropora sp) colony releasing egg-sperm bundles during the mass coral spawning each March at Ningaloo Reef, Western Australia

Fred Bavendam / Staghorn Coral (Acropora cervicornis) colony releasing egg-sperm bundles during the mass coral spawning each March at Ningaloo Reef, Western Australia

Fred Bavendam / Stony Coral (Acropora sp) colony releasing egg-sperm bundles during the annual mass coral spawning on the Great Barrier Reef, Queensland, Australia

Fred Bavendam / Staghorn Coral (Acropora cervicornis) colony with an extensive bleached area at its center, Kimbe Bay, Papua New Guinea

Christian Ziegler / Elkhorn Coral (Acropora palmata), Bastimentos Marine National Park, Bocas del Toro, Panama

Juergen Freund / Vast area of plate corals (Acropora sp) in the reef, Sulawesi, Indonesia.

Juergen Freund / Plate coral (Acropora sp) growing in the reef, Komodo NP, Indonesia, Indo-pacific.

Birgitte Wilms / Stony Coral (Acropora sp) polyps, Solomon Islands

Birgitte Wilms / Stony Coral (Acropora sp), Indonesia

Birgitte Wilms / Stony Coral (Acropora sp), Indonesia

Juergen Freund / Coral (Acropora sp) in the shallows. Misool, Raja Ampat, West Papua, Indonesia.

Georgette Douwma / Hard and soft corals on reef with a small table coral (Acropora sp.). Indonesia, October.

GEORGETTE DOUWMA / Bleached coral {Acropora sp} bleaching caused by loss of algae, Maldives.

Peter Scoones / Bleached coral {Acropora sp} with meter showing 31C temperature which could cause the damage, Indian ocean

Juergen Freund / Closed polyps of Hard coral {Acropora sp} Philippines, Indo-pacific

Georgette Douwma / Coral reef with table coral (Acropora sp), brain coral and porites coral. Rinca, Komodo National Park, Indonesia

Juergen Freund / Staghorn coral {Acropora sp} growing out of tablecoral, Great Barrier Reef, Australia

Juergen Freund / Close up of (Acropora sp) coral fungus coral, Great Barrier Reef, Australia

Sue Daly / Table coral (Acropora sp) showing the effect of White Band Disease, Cebu, Philippines, March

Fred Bavendam / Staghorn Coral (Acropora robusta) and several species of small Damselfish (Chromis sp), Great Barrier Reef, Australia

Chris Newbert / Stony Coral (Acropora sp) formation, Indonesia

Michele Westmorland / Fish schooling above Stags horn coral {Acropora sp} on the coral reefs of Narutu Island near Kitava, Trobriands, Papua New Guinea

Tim Laman / Reef view with hard corals (Acropora sp.) and schools of Slender Anthias (Luzonichthys waitei) and Lyretail Anthias (Pseudanthias squamipinnis) hovering over the reef. Vatu-i-Ra, Fiji.

Tim Laman / Coral reef view with (Acropora sp) hard coral and soft corals. Somosomo Strait, Rainbow Reef, Fiji

Juergen Freund / Juvenile corals {Acropora sp} Great Barrier Reef, Australia, Indo-pacific

GEORGETTE DOUWMA / Purple acropora coral {Acropora sp}, Great Barrier Reef, Australia.

Hiroya Minakuchi / Stony Coral (Acropora sp) branches, Borneo, Malaysia

GEORGETTE DOUWMA / Bleached {Acropora sp} coral caused by loss of algae. Maldives.

Peter Scoones / Bleached {Acropora sp} coral caused by loss of algae showing purple polyps. Maldives.

GEORGETTE DOUWMA / Hard coral {Acropora sp} Great Barrier Reef, Queensland, Australia

GEORGETTE DOUWMA / Bleached {Acropora sp} coral caused by loss of algae. Maldives.

Steven David Miller / Hard coral (Acropora sp) Lady Elliott Island, Great Barrier Reef, Queensland, Australia

Hiroya Minakuchi / Staghorn Coral (Acropora cervicornis) in coral reef around Sipadan Island, Celebes Sea, Borneo

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) living in burrow in Stony Coral (Acropora sp) 30 feet deep Solomon Islands

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) living in burrow in Stony Coral (Acropora sp) 30 feet deep, Solomon Islands

Chris Newbert / Stony Coral (Acropora sp) and baitfish, Solomon Islands

Norbert Wu / Candy Cane Sea Star (Fromia monilis) on Acropora Coral, Seychelles, Indian Ocean

Norbert Wu / Staghorn Coral spawning, coral colonies release eggs and sperm one night a year after the late spring's full moon, Great Barrier Reef

Norbert Wu / Staghorn Coral spawning occurs on consecutive evenings starting five days after the late spring's full moon, Great Barrier Reef

Chris Newbert / Mandarinfish (Synchiropus splendidus) mating in Stony Coral (Acropora sp) 10 feet deep, Solomon Islands

Birgitte Wilms / Stony Coral (Acropora sp) growing close to surface, five feet deep, Solomon Islands

Birgitte Wilms / Stony Coral (Acropora sp) growing close to surface, five feet deep, Solomon Islands

Fred Bavendam / Stony Coral (Acropora sp) colony releasing egg-sperm bundles during the mass coral spawning each March at Ningaloo Reef, Western Australia

Fred Bavendam / Cabbage Coral (Turbinaria sp) and Stony Coral (Acropora sp) with fish in reef, Papua New Guinea

Fred Bavendam / Reticulated Dasycllus (Dascyllus reticulatus) and several other kinds of small reef fish hover above a colony of Staghorn Coral, Bali, Indonesia

Fred Bavendam / Reticulated Dascyllus (Dascyllus reticulatus) and several kinds of Cardinalfish hover about a colony of Staghorn Coral, Indonesia

Flip Nicklin / Stony Coral (Acropora sp) underwater, Grand Cayman

Fred Bavendam / Threespot Damselfish (Eupomacentrus planifrons) living amidst Staghorn Coral (Acropora cervicornis) fish kills Coral polyps and feeds on algae, Venezuela

Fred Bavendam / Threespot Damselfish (Eupomacentrus planifrons) living amidst Staghorn Coral (Acropora cervicornis) fish kills Coral polyps and feeds on algae, Venezuela

Juergen Freund / Staghorn coral spawning {Acropora sp} Great Barrier Reef, Australia

Juergen Freund / Staghorn coral spawning {Acropora sp} Great Barrier Reef, Australia

Jeff Rotman / Reef fish asleep amongst fingers of Staghorn Coral (Acropora sp) Red Sea, Egypt

Juergen Freund / Staghorn coral spawning {Acropora sp} Great Barrier Reef, Australia

Juergen Freund / Staghorn coral spawning {Acropora sp} Great Barrier Reef, Australia

Francis Abbott / Staghorn coral (Acropora sp} Bahrain, Red Sea.

GEORGETTE DOUWMA / Bleached {Acropora sp} coral caused by loss of algae. Maldives.

Juergen Freund / Staghorn coral {Acropora sp} Great barrier reef, Australia Queensland

GEORGETTE DOUWMA / Stony coral {Acropora sp} + Yellow plate coral {Turbinaria sp} Red Sea

GEORGETTE DOUWMA / Hard Acropora coral close up, Great Barrier Reef, Australia

Jeff Rotman / Staghorn coral {Acropora sp} with polyps open at night. Palau, Micronesia, Pacific.

Roberto Rinaldi / Polyps of hard coral (acropora sp), Philippines.

Roberto Rinaldi / Polyps of hard coral (Acropora sp), Sabah, Borneo.

Roberto Rinaldi / Acropora coral and damsel fish (Pseudanthias sp)with diver far above, Papua New Guinea. Model released.

Christian Ziegler / Elkhorn Coral (Acropora palmata), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Elkhorn Coral (Acropora palmata), Bastimentos Marine National Park, Bocas del Toro, Panama

Birgitte Wilms / Stony Coral (Acropora sp), Indonesia

Roberto Rinaldi / Diver looking at Acropora coral (Acropora sp.) Great Barrier Reef, Australia.

Roberto Rinaldi / Staghorn coral (acropora sp) growing indside barrel sponge (xestospongia sp), Sulawesi, Indonesia

Roberto Rinaldi / Polyps of a hard coral (acropora sp). Lankayan island, Borneo, Malaysia.

Roberto Rinaldi / Scuba diver with corals (Acropora sp), New Ireland, Papua New Guinea Model released.

Fred Bavendam / Freckled Hawkfish (Paracirrhites forsteri) hoping to grab a juvenile Damselfish (Chromis sp) on a staghorn coral colony, Manado, North Sulawesi, Indonesia

Juergen Freund / Plate coral view from below {Acropora sp} Indo-pacific