World’s seas heated by a record 23 zettajoules last year
Bleached coral in Thailand: Between January 2023 and September 2025, 84% of global coral reefs experienced bleaching-level heat stress. Photograph: Napat Wesshasartar/ReutersView image in fullscreenBleached coral in Thailand: Between January 2023 and September 2025, 84% of global coral reefs experienced bleaching-level heat stress. Photograph: Hassan Ammar/APThe scientists found a clear acceleration of sea level rise in the western Mediterranean, even as the eastern part showed uneven gains.
- ▪Bleached coral in Thailand: Between January 2023 and September 2025, 84% of global coral reefs experienced bleaching-level heat stress.
- ▪Photograph: Napat Wesshasartar/ReutersView image in fullscreenBleached coral in Thailand: Between January 2023 and September 2025, 84% of global coral reefs experienced bleaching-level heat stress.
- ▪Photograph: Hassan Ammar/APThe scientists found a clear acceleration of sea level rise in the western Mediterranean, even as the eastern part showed uneven gains.
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| Original publisher | World news | The Guardian |
| Canonical URL | https://www.theguardian.com/environment/2026/sep/30/worlds-seas-warmed-23-zettajoules-2025 |
| Publication time | Wed, 30 Sep 2026 06:00:13 GMT |
| Retrieval time | 2026-09-30T06:11:55.929Z |
| Last seen | 2026-09-30T06:11:55.929Z |
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Bleached coral in Thailand: Between January 2023 and September 2025, 84% of global coral reefs experienced bleaching-level heat stress. Photograph: Napat Wesshasartar/ReutersView image in fullscreenBleached coral in Thailand: Between January 2023 and September 2025, 84% of global coral reefs experienced bleaching-level heat stress. Photograph: Napat Wesshasartar/ReutersEnvironmentWorld’s seas heated by a record 23 zettajoules last yearThe injection of thermal energy, 40 times that used by humanity in total, comes amid an increasing rise in sea levels and continuing acidificationAjit NiranjanWed 30 Sep 2026 02.00 EDTSharePrefer the Guardian on GoogleA record-breaking 23 zettajoules of heat was sunk into the world’s seas last year, leaving ocean waters hotter, higher and less hospitable, a…
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