What Happened: Global Coral Bleaching Events
Global coral bleaching events would not occur without climate change, mainly caused by the burning of fossil fuels. Additionally, contrary to what was believed, the occurrence of an El Niño is not enough to cause mass bleaching on a global scale, something that has happened four times in human history, all in the last three decades: 1998, 2010, 2014-2017, and 2018-2025.
The conclusion is from a new study conducted by researchers from Climate Central and published in the journal Oceanography. To reach the result, the research analyzed these four major global bleaching events and how they coincided with El Niño.
Why It Matters: The Impact on Communities and the Environment
Coral bleaching events have a significant impact on communities that depend on coral reefs for their livelihood. Additionally, coral reefs play a crucial role in protecting coastlines from storms and maintaining marine biodiversity.
Andrew Pershing, director of Climate Central and lead author of the study, states that we are "almost certainly" on our way to another global bleaching event, given the worsening climate change, combined with El Niño, which may become very strong by the end of this year.
The Mechanism Behind Bleaching: The Science Behind the Process
Coral bleaching occurs when corals are exposed to high temperatures, causing the expulsion of the symbiotic algae that live inside the coral tissues and are responsible for nutrient production. Without these algae, corals lose their color and ability to produce nutrients, leading to bleaching.
Researchers used a method of attributing extreme events with multiple models to understand how the climate crisis and, especially, greenhouse gas emissions (GHG) impact bleaching. They compared this method with the coral bleaching risk model developed by the National Oceanic and Atmospheric Administration (NOAA).
Bigger Picture: The Trend of Increasing Number of Regions at Risk of Bleaching
Researchers also highlight the trend of an increasing number of regions at risk of bleaching since the 1980s. They suggest that many regions are now facing stressful temperatures several times a decade.
In June, the oceans set a record for heat for the month. This suggests that climate change is worsening the risk of coral bleaching worldwide.
What Happens Next: Implications and Forecasts for the Future
With the worsening of climate change, it is likely that coral bleaching events will become more frequent and severe. This may have a significant impact on communities that depend on coral reefs for their livelihood.
It is essential that measures are taken to reduce greenhouse gas emissions and mitigate the impact of climate change on coral reefs. This may include implementing policies to reduce pollution, protecting marine areas, and promoting sustainable fishing practices.
Conclusion: The Importance of Protecting Coral Reefs
Coral reefs are important ecosystems that play a crucial role in maintaining marine biodiversity and protecting coastlines. It is fundamental that measures are taken to protect these ecosystems and mitigate the impact of climate change.
Andrew Pershing states that "people underestimate the value of healthy reefs. They are home to a huge number of species, provide food for many communities, generate income through tourism, and help protect coastlines from storms".
Source / Reference
Source: ClimaInfo
Original URL: https://climainfo.org.br/2026/07/23/branqueamento-de-corais-seria-impossivel-sem-as-mudancas-climaticas/