1 month ago
Climate Change Main Cause of Global Coral Bleaching
A new study shows that climate change, not just natural events like El Nino, is the main cause of coral bleaching.
Coral bleaching happens when the ocean gets too warm, and the corals lose their colorful algae.
This study looked at big bleaching events from 1998 to 2025 and found that human-caused climate change makes these events more likely and widespread.
Without climate change, bleaching would be rare.
The study also found that in the future, climate change will still be a bigger risk for coral reefs than El Nino.
Many people and countries depend on healthy coral reefs for food and jobs, so reducing emissions is crucial to save them.
Climate change is the primary cause of global coral bleaching, making such events frequent and widespread.
El Nino events contribute to coral bleaching but are not the sole cause of mass bleaching events.
The study analyzed major bleaching events from 1998 to 2025 and found that climate change significantly increases bleaching risk.
In the 2018-2025 bleaching event, 70 out of 71 regions showed moderate to high risk due to climate change.
Regions like the Caribbean, Central and South American coasts, and eastern Asia are especially vulnerable to bleaching in 2026-2027.
- Who
- Researchers from Climate Central and other international institutions
- What
- A study on the primary causes of global coral bleaching
- Where
- Global coral reefs, with specific focus on regions like the Caribbean and eastern Asia
- When
- Published on 21 July, with data on events from 1998 to 2025
- Why
- To understand the impact of climate change versus natural phenomena like El Nino on coral bleaching
Climate Change Impact
El Nino Impact
Primary Cause of Bleaching
Climate Change Impact
Climate change is the primary cause of global coral bleaching, making such events frequent and widespread.
El Nino Impact
El Nino events are the primary cause of coral bleaching, as they bring higher sea-surface temperatures.
Risk Factors
Climate Change Impact
Human-caused climate change significantly increases the risk of coral bleaching, with 70 out of 71 regions showing moderate to high risk due to climate change.
El Nino Impact
El Nino conditions contribute to low-level coral bleaching, but are not the sole cause of mass bleaching events.
Key facts
- Study Lead Author
- Andrew Pershing, Chief Program Officer at Climate Central
- Study Publication Date
- 21 July
- Study Journal
- Oceanography
- Key Coral Reefs Affected
- Great Barrier Reef, Red Sea Coral reefs, Maldives Atoll reefs, Andaman and Nicobar Island reefs
- Major Bleaching Events
- 1998, 2010, 2014-17, 2018-2025
- Vulnerable Regions in 2026-2027
- Caribbean, Central and South American coasts, eastern Asia coasts
Quotes
Andrew Pershing
Chief Program Officer at Climate Central and lead author of the study
“"Our study shows that without climate change, coral bleaching would be a rare and isolated event, and global mass coral bleaching simply would not occur."”
theprint.in
Sources
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