The fourth global bleaching event is confirmed

Assembled from 44 blocks · 1 evidence · 19 related

1. Story
2. NOAA Coral Reef Watch and the International Coral Reef Initiative jointly confirmed that the thermal stress recorded through 2023 and into 2024 constituted a fourth global bleaching event, with bleaching-level heat stress recorded across reef areas in the Atlantic, Pacific and Indian Oceans. Subsequent updates reported the affected share of global reef area rising through the following year to a level exceeding any previous event. The declaration is a statement about satellite-measured thermal stress across ocean basins, not a survey of mortality, and the two should not be read as the same measurement.
3. Knowledge
4. Coral bleaching
5. Degree Heating Weeks (DHW)
6. NOAA Coral Reef Watch
7. International Coral Reef Initiative
8. The fourth global bleaching event is confirmed
9. Connections
10. NOAA Coral Reef Watch
11. International Coral Reef Initiative
12. NOAA Coral Reef Watch
13. International Coral Reef Initiative
14. Coral bleaching
15. Degree Heating Weeks (DHW)
16. The fourth global bleaching event is confirmed
17. Degree Heating Weeks (DHW)
18. The third global bleaching event
19. The fourth global bleaching event is confirmed
20. The current state of the fourth global bleaching event is not established in this package
21. The fourth global bleaching event is confirmed
22. The International Coral Reef Initiative is formed
23. The fourth global bleaching event is confirmed
24. The current state of the fourth global bleaching event is not established in this package
25. Reef-building corals (Scleractinia)
26. Marine heatwave
27. Degree Heating Weeks (DHW)
28. Symbiont shuffling and thermal tolerance
29. The first global mass bleaching event
30. A published projection that reefs would bleach faster than they could recover
31. The second global bleaching event
32. The third global bleaching event
33. Mass bleaching on the Great Barrier Reef
34. A second consecutive year of mass bleaching on the Great Barrier Reef
35. The interval between severe bleaching events is measured, and it has collapsed
36. Mass bleaching on the Great Barrier Reef during a La Nina
37. The fourth global bleaching event is confirmed
38. The fifth mass bleaching on the Great Barrier Reef since 2016
39. The current state of the fourth global bleaching event is not established in this package
40. Coral bleaching
41. NOAA Coral Reef Watch
42. The fourth global bleaching event is confirmed
43. Evidence
44. NOAA Coral Reef Watch and ICRI confirmed in April 2024 that bleaching-level heat stress across the Atlantic, Pacific and Indian Ocean basins constituted a fourth global bleaching event, with the affected share of world reef area subsequently reported as rising above that of any previous event. V55 verification basis: NOT retrieved. The April 2024 confirmation is stated from the producing model's knowledge; no percentage of affected reef area is quoted here, and the state of the event as of August 2026 is not established — see EVT_GLOBAL_EVENT_STATE_2026.