Tag: Ocean Conservation

Ocean in Peril: Understanding the Escalating Threat of Marine Heatwaves and Acidification

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Ocean sea life and coral reef. Credit: Francesco Ungaro, Unsplash.


As the planet grapples with climate change, our oceans are experiencing unprecedented shifts. Recent research by Joel Wong, Matthias Münnich, and Nicolas Gruber, Column‐Compound Extremes in the Global Ocean published in the Journal of Oceanic Studies into the increasing frequency, intensity, and spatial extent of compound marine extremes—particularly marine heatwaves combined with ocean acidification—highlights a looming crisis for global marine ecosystems. The study, conducted over nearly six decades, offers important insights into these phenomena and underscores the urgent need for global environmental strategies.

The Escalating Intensity of Marine Extremes

The study analyzes data from 1961 to 2020, revealing a concerning trend in the behavior of oceanic compound extremes, referred to as Column-Compound Extreme Events (CCX). These events, characterized by simultaneous occurrences of extreme heat and acidity, have become more intense and longer-lasting over the years. Such changes are primarily driven by global warming and increased carbon dioxide emissions, which not only warm but also acidify ocean waters at alarming rates.

Impact on Marine Life

The effects of these compound extremes are profound. Marine ecosystems, particularly coral reefs, kelp forests, and the myriad species dependent on them, face severe threats from prolonged exposure to extreme conditions. The study estimates that the habitable space within the water column has potentially reduced by up to 75%, a stark indication of the dire conditions many marine organisms now endure. This habitat compression threatens biodiversity, disrupts fishing industries, and jeopardizes the livelihoods of communities dependent on these ecosystems.

Geographic and Vertical Spread

The research identifies that these extremes are not uniformly distributed. Tropical and high latitude regions, known for their rich biodiversity, are the most affected. The impacts extend beyond the surface, complicating the survival conditions for species that cannot migrate to more hospitable waters.

Role of Climate Phenomena

El Niño and other climate phenomena play a significant role in modulating these compound events. The study highlights specific patterns and regional variations in CCX occurrences, linking them to broader climatic shifts that influence ocean currents and temperature distribution.

Need for Advanced Modeling Techniques

A key contribution of this research is the development of advanced models that enhance our understanding of CCX characteristics and drivers. These models are crucial for predicting future changes and implementing effective conservation strategies. They also serve as a vital tool for policymakers and environmental planners as they prepare to mitigate the effects of these changes.

Summing Up

The findings from the study serve as a clarion call for immediate action. Protecting our oceans from compound extremes requires global cooperation and innovative solutions aimed at reducing greenhouse gas emissions and enhancing marine conservation efforts. This research provides a foundation for understanding the scale of the problem and outlines the critical areas for needed interventions.

The preservation of marine biodiversity and the sustainability of our global ocean ecosystems depend on our ability to respond effectively to the challenges posed by climate change. Through informed policy-making and collaborative international efforts, there is hope for mitigating the impact of these profound marine disturbances.

Source: Wong, J., Münnich, M., & Gruber, N. (2024). Column‐Compound Extremes in the Global Ocean. Journal of Oceanic Studies, 5(3). https://doi.org/10.1029/2023AV001059.

‘The biggest conservation victory ever!’ Global treaty to protect oceans reached

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Photo of coral reef by Jimmy Chang on Unsplash.
Photo of a coral reef by Jimmy Chang on Unsplash.

“This is a historic day for conservation and a sign that in a divided world, protecting nature and people can triumph over geopolitics,” said Greenpeace in response to an agreement to protect world’s marine biodiversity.

By Jon Queally, Common Dreams

Ocean conservationists expressed elation late Saturday after it was announced—following nearly two decades of consideration and effort—that delegates from around the world had agreed to language for a far-reaching global treaty aimed at protecting the biodiversity on the high seas and in the deep oceans of the world.

“This is a historic day for conservation and a sign that in a divided world, protecting nature and people can triumph over geopolitics,” declared Dr. Laura Meller, the oceans campaigner for Greenpeace Nordic.

“We praise countries for seeking compromises, putting aside differences, and delivering a Treaty that will let us protect the oceans, build our resilience to climate change and safeguard the lives and livelihoods of billions of people,” Meller added.

The final text of the Global Ocean Treaty, formally referred to as the Biodiversity Beyond National Jurisdiction treaty (BBNJ), was reached after a two-week round of talks that concluded with a 48-hour marathon push between delegations at the United Nations headquarters in New York.

“This is huge,” said Greenpeace in a social media post, calling the agreement “the biggest conservation victory ever!”

Rena Lee of Singapore, the U.N Ambassador for Oceans and president of the conference hosting the talks, received a standing ovation after announcing a final deal had been reached. “The shipped has reached the shore,” Lee told the conference.

“Following a two-week-long rollercoaster ride of negotiations and super-hero efforts in the last 48 hours, governments reached agreement on key issues that will advance protection and better management of marine biodiversity in the High Seas,” said Rebecca Hubbard, director of the High Seas Alliance, a coalition of over 40 ocean-focused NGOs that also includes the International Union for the Conservation of Nature (IUCN).

Minna Epps, director of the Global Marine and Polar Programme at the IUCN, said the agreement represents a new opportunity.

“The High Seas Treaty opens the path for humankind to finally provide protection to marine life across our one ocean,” Epps said in a statement. “Its adoption closes essential gaps in international law and offers a framework for governments to work together to protect global ocean health, climate resilience, and the socioeconomic wellbeing and food security of billions of people.”

Protecting the world’s high seas, which refers to areas of the oceans outside the jurisdiction of any country, is part of the larger push to protect planetary biodiversity and seen as key if nations want to keep their commitment to the UN-brokered Kunming-Montreal Global Biodiversity Framework—also known as the known as the 30×30 pledge—that aims protect 30 percent of the world’s natural habitat by 2030.

“With currently just over 1% of the High Seas protected,” said the High Seas Alliance in a statement, “the new Treaty will provide a pathway to establish marine protected areas in these waters.” The group said the treaty will make acheiving the goals of the Kunming-Montreal agreement possible, but that “time is of the essence” for the world’s biodiversity.

“The new Treaty will bring ocean governance into the 21st century,” said the group, “including establishing modern requirements to assess and manage planned human activities that would affect marine life in the High Seas as well as ensuring greater transparency. This will greatly strengthen the effective area-based management of fishing, shipping, and other activities that have contributed to the overall decline in ocean health.”

According to Greenpeace’s assessment of the talks:

The High Ambition Coalition, which includes the EU, US and UK, and China were key players in brokering the deal. Both showed willingness to compromise in the final days of talks, and built coalitions instead of sowing division. Small Island States have shown leadership throughout the process, and the G77 group led the way in ensuring the Treaty can be put into practice in a fair and equitable way.

The fair sharing of monetary benefits from Marine Genetic Resources was a key sticking point. This was only resolved on the final day of talks. The section of the Treaty on Marine Protected Areas does away with broken consensus-based decision making which has failed to protect the oceans through existing regional bodies like the Antarctic Ocean Commission. While there are still major issues in the text, it is a workable Treaty that is a starting point for protecting 30% of the world’s oceans.

The group said it is now urgent for governments around the world to take the final step of ratifying the treaty.

“We can now finally move from talk to real change at sea. Countries must formally adopt the Treaty and ratify it as quickly as possible to bring it into force, and then deliver the fully protected ocean sanctuaries our planet needs,” Meller said. “The clock is still ticking to deliver 30×30. We have half a decade left, and we can’t be complacent.”