Rising temperatures threaten to destroy coral reefs

Rising temperatures threaten to destroy coral reefs

The effects of climate change are increasing year after year, and its effects go beyond the land and reach the depths of the seas. In this context, international environmental reports are emerging that reveal worrying indicators about the health of marine systems, most notably coral reefs, which are among the most sensitive systems to climate change.

According to a report issued byInternational Coral Reef Conservation Initiative (ICRI), these vital systems were exposed to unprecedented waves of mass bleaching, affecting about 84% of coral reefs around the world. This phenomenon heralds an environmental catastrophe that threatens marine biodiversity, and its effects are reflected in coastal communities, local economies, and global climate stability.

Therefore,Earth GuardsIn this article, we review the highlights of the report, and discuss how this crisis relates to the Sustainable Development Goals (SDGs), and the challenges it poses to the future of the marine environment and the planet in general. So keep reading.

Dimensions of the problem

A recent report issued by the International Coral Reef Protection Initiative revealed alarming numbers that illustrate the scale of the crisis facing marine ecosystems. From January 2023 until the end of March 2025, about 84% of the world’s coral reefs were exposed to bleaching caused by heat stress associated with climate change. This high percentage indicates a crisis that threatens marine biodiversity and the livelihoods of millions of people who depend on these systems for food, work, and coastal protection.

The report explains that this phenomenon is not new or surprising, but rather the result of environmental accumulations that have been ongoing for decades, to which the excessive use of fossil energy and human pressure on natural resources contributed. Since the 1950s, coral reefs have gradually begun to lose their ability to adapt, causing their living surface area to decrease by less than half globally.

The danger of bleaching lies in its profound biological effects, which go beyond just the corals losing their bright colors. When water temperatures rise or pollutants increase, coral reefs expel microorganisms that provide the reefs with food through a process similar to photosynthesis. When reefs lose these organisms, they weaken; Because they cannot feed well, and may die if difficult conditions continue for a long time.

Heat threatens coral reefs

Among the most prominent causes of this disaster is the unprecedented rise in ocean temperatures. Dr. Eunhee Kim, Director of the Korea Climate and Ocean Research Institute, has warned that some marine areas have witnessed a rise in temperatures of 5 degrees Celsius since the beginning of 2023. In sensitive ecosystems such as coral reefs, this rise represents something similar to a “thermal tsunami” that threatens to reshape the balance of marine life.

According to the report, this mass bleaching is the fourth of its kind globally, but it is the most severe so far, and this is what prompted climate prediction centers to re-evaluate their standards and add new levels to monitor the scale of the crisis.

However, the threat does not come from heat alone; This phenomenon intersects with other human practices, such as water pollution and overfishing. This puts coral reefs facing a complex series of simultaneous threats, and this is an unequal battle unless immediate and radical measures are taken to protect these vital marine systems.

The role of reefs in human life

The International Coral Reef Initiative estimates that about a third of known marine organisms depend on these reefs for their survival, along with more than a billion people around the world who derive their livelihoods, food, and coastal protection from them. Coral reefs are not just natural decorations in the deep sea or a haven for rare species of fish, but rather they are considered one of the most important pillars of environmental balance on planet Earth.

The role of coral reefs is not limited to providing food security for coastal residents, but they also contribute to regulating carbon dioxide concentrations in the atmosphere, as they act as natural reservoirs that absorb large amounts of carbon. Therefore, the deterioration of these ecosystems means a climate imbalance, which may lead to an acceleration in the pace of global warming and exacerbate climate change crises.

Despite the seriousness of the scene, there is still an opportunity to remedy the situation; Experts confirm that a serious commitment to reducing carbon emissions resulting from fossil fuels can – in accordance with the Paris Climate Agreement – contribute to reducing global warming. Even if the target of 1.5 degrees Celsius was exceeded last year, immediately abandoning fossil fuels would slow the pace of climate change and give coral reefs a chance to survive.

This stage requires bolder steps, starting with restructuring marine protection plans, stopping overfishing activities, expanding the scope of protected areas, and activating international policies to rehabilitate deteriorating coral reefs. Here comes the responsibility of countries that own vast areas of coral reefs, such as France, which is home to more than 60,000 square kilometers of coral reefs around the world.

With this understanding,Earth Guards pursued efforts to protect coral reefs, highlighting innovative scientific experiments that sought to counter the effects of thermal bleaching; In a previous article entitled“Cooling Coral Reefs: A New Strategy to Protect the Marine Environment“, she reviewed an experiment carried out in 2008 in the American Samoa Islands, where floating pumps were used to cool the surrounding waters. reefs, and this contributed to reducing the effect of bleaching in some areas.

Although these experiments were not sufficient to stop the creep of the crisis, they were important milestones that were monitored byEarth Guards as part of the ongoing documentation of research and innovation paths in the face of climate change. It predicted this disaster a year ago, when it warned in the same article of a recurrence of the widespread bleaching phenomena that the world witnessed between 1998 and 2010, as a result of the accelerating pace of climate change.

Earth Guardsat the time indicated that the continued rise in temperatures in this way portends a dark future, during which most coral reefs may lose their lives by the year 2050, which is confirmed today by the shocking indicators of the new report.

In the face of this escalating danger,Earth Guards renewed its call to all parties, stressing the need to take serious measures to protect these threatened ecosystems; These successive warnings indicate the importance of urgent action. The future of the reefs, and the fate of millions of lives that depend on them, rests in our hands.