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What causes coral bleaching on the Great Barrier Reef?

What causes coral bleaching on the Great Barrier Reef?

An overview of coral bleaching on the Great Barrier Reef.
Encyclopædia Britannica, Inc.
  • Encyclopædia Britannica, Inc.
    Media Editor: Lauren Sims
    How to Pronounce Pampas
    White text on a blue textured background reading Pampas.
  • Encyclopædia Britannica, Inc.
    An overview of the land, people, and economy of Malaysia.
    Explore Malaysia's noncontiguous Southeast Asian peninsula and island of Borneo and the people therein
    Explore Malaysia's noncontiguous Southeast Asian peninsula and island of Borneo and the people therein
  • Encyclopædia Britannica, Inc.
    Media Editor: Lauren Sims
    How to Pronounce Fernando de Noronha
    A textured blue background with white text reading Fernando de Noronha.
  • Contunico © ZDF Studios GmbH, Mainz; Thumbnail © Vincent Thedyono/Dreamstime.com
    Studying fossil coral to uncover information about Earth's history.
    Understand how researchers study fossil corals to uncover the earth's palaeontological history
    Understand how researchers study fossil corals to uncover the earth's palaeontological history
  • © Fun Travel TV (A Britannica Publishing Partner)
    A cuttlefish changing colour as it swims near the Great Barrier Reef, off the northeastern coast of Australia.
    Observe a cuttlefish changing its colour as it swims near the Great Barrier Reef, off the coast of Australia
    Observe a cuttlefish changing its colour as it swims near the Great Barrier Reef, off the coast of Australia
  • Encyclopædia Britannica, Inc.
    Learn how the corals of the Great Barrier Reef reproduce.
    How do corals reproduce?
    How do corals reproduce?
  • © Fun Travel TV (A Britannica Publishing Partner)
    Explore the waters of Lady Elliot Island, part of the Great Barrier Reef, off the northeastern coast of Australia.
    Experience the stunning array of marine life in the waters of Lady Elliot Island, part of the Great Barrier Reef, off the northeastern coast of Australia
    Experience the stunning array of marine life in the waters of Lady Elliot Island, part of the Great Barrier Reef, off the northeastern coast of Australia
Related Articles: Coral bleaching , coral , coral reef , Great Barrier Reef

News •

Reefs' new name echoes the legacy of the 'Bingil Bay Bastard' • Nov. 6, 2026, 3:00 PM ET (ABC News (Australia))
Climate change is killing the plants of Uluṟu‑Kata Tjuṯa: Aṉangu traditional owners are concerned • Nov. 1, 2026, 5:00 PM ET (Phys.org)
One giant clam contains a month‑by‑month diary of the Great Barrier Reef’s climate 200 years ago • Oct. 23, 2026, 11:30 AM ET (The Weather Channel)
Nearly All of the World’s Shallow Coral Reefs Are Now Critically Endangered • Oct. 22, 2026, 8:00 AM ET (New York Times)
Filming coral bleaching at an unprecedented level • Oct. 22, 2026, 6:13 AM ET (BBC)
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