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Within the ocean’s vast expanse lie immense reservoirs of carbon – surpassing those found in either the atmosphere or the land.

The ocean actively captures and incorporates carbon through various natural mechanisms, locking in a significant portion that would otherwise circulate within the Earth’s systems, thereby functioning as a continuous carbon sink.

This crucial role mitigates climate change by reducing the amount of carbon which ends up in the atmosphere. If the ocean remains as a net carbon sink, it can aid in offsetting ongoing emissions and slowing global warming.

Unfortunately, a longstanding misconception persists that the ocean has an infinite resilience to human exploitation and negligence – likely stemming from the fact that the consequences of our actions are obscured beneath the surface.

Unsustainable use of the ocean’s resources – such as through overfishing – coupled with warming and acidification progressively erode the ocean’s capacity to regulate carbon and heat and its ability to sustain essential resources and services. 

Consequently, rates of carbon sequestration are weakening and the vast carbon reserves held within marine ecosystems are increasingly susceptible to release. 

This guest post lays out the climate opportunities presented by “blue carbon” and the challenges these ecosystems face.

Blue carbon is a term that refers to carbon captured by the world’s ocean and coastal ecosystems that has potential to be conserved or enhanced. Blue carbon is stored in vegetated coastal and marine ecosystems such as seagrass, mangroves and salt marshes.

The opportunity of coastal ecosystems

Coastal ecosystems – particularly vegetated ones, such as mangroves, seagrasses and salt marshes – are among the most crucial marine systems for storing carbon. Like plants on land, marine vegetation absorbs CO2 through photosynthesis. Because their waterlogged soils are low in oxygen, the carbon stored there can be locked away for centuries.

Despite only occupying approximately 0.5% of the ocean, these ecosystems boast remarkable carbon sequestration capabilities, contributing more than 50% of total carbon buried in marine sediments.

However, these vital ecosystems also face relentless human-caused pressures, from runoff of nutrients and sediments to urban expansion. They are being destroyed at an alarming pace – an average of 2% loss per year for mangroves – and are among the most threatened ecosystems on the planet. 

Nevertheless, amidst this threat lies an opportunity: by reversing the conditions that are causing their decline, we can restore lost ecosystems and harness their potential as carbon sequestration hotspots once more.

The chart below shows the annual carbon storage potential of coastal ecosystems around the world, with yellow and light green indicating low storage potential and darker blues indicating high storage potential. The US, Mexico, Australia, Indonesia and Mexico stand out as countries with particularly high storage potential.    

Map of global blue carbon stocks (in millions of tonnes of carbon), with yellow and green colours representing lower amounts of blue carbon storage potential and blues indicating higher amounts of storage potential. Source: Bertram et al. (2021).
Map of global blue carbon stocks (in millions of tonnes of carbon), with yellow and green colours representing lower amounts of blue carbon storage potential and blues indicating higher amounts of storage potential. Source: Bertram et al. (2021)

Managing coastal vegetated ecosystems to enhance carbon sequestration, often referred to as “blue carbon”, represents a valuable nature-based strategy for mitigating climate change. 

While the amount of carbon that is offset through these methods is estimated to be at least an order of magnitude below other mitigation approaches – such as ocean alkalinisation and direct carbon capture and storage – they have additional benefits. 

These ecosystems also enhance adaptation by stabilising coastlines, safeguarding against erosion and storms, enhancing water quality and nurturing marine life – thus promoting biodiversity through the provision of shelter, food and nursery grounds.

Climate and biodiversity

Blue carbon is a prime example of how climate change and the alarming decline in global biodiversity are connected

Initiatives focused on blue carbon restoration – such as the “Mangroves for Coastal Resilience” project in Indonesia, the largest such initiative in the world – not only enhance carbon sequestration, but also reverse habitat loss and bolster biodiversity. Safeguarding marine biodiversity can also help secure the long-term well-being and prosperity of people whose lives and livelihoods are tightly linked to the oceans. 

For example, declines in marine biodiversity undermine ecosystem resilience, heightening vulnerability to environmental disturbances and impacting economies reliant on marine resources. Loss of species degrades the food webs underpinning fisheries, jeopardising food security and livelihoods.

Furthermore, biodiversity loss directly compromises human health by fostering the emergence of zoonotic diseases that pass from animals to humans, diminishing water quality and impeding the exploration of new pharmaceuticals and treatments. 

Protecting communities

Coastal restoration projects are already being carried out around the world, from small, local projects to larger initiatives.

They also encompass a range of activities, from planting new mangrove trees to managing tidal flows.

There are several crucial factors that demand careful consideration before implementing such a project.

Among these is the need to prioritise the protection of intact ecosystems. By safeguarding these areas, we can prevent the loss of carbon they have already sequestered and sidestep the time lag associated with re-establishing vital ecosystem services following habitat restoration. 

Additionally, it is imperative to address the underlying pressures contributing to ecosystem loss, such as sewage discharge and agricultural runoff. 

Volunteers planting spartina grasses at a salt marsh restoration event, Jamaica Bay Wildlife Refuge.
Volunteers planting spartina grasses at a salt marsh restoration event, Jamaica Bay Wildlife Refuge. Credit: Johann Schumacher / Alamy Stock Photo.

Restoration efforts must also be designed to withstand potential future challenges, such as changing land-use patterns and the projected impacts of climate change. Proactive measures to safeguard and restore coastal ecosystems should account for these complex and dynamic factors to ensure their long-term success and resilience in the face of ongoing environmental changes.

Local engagement and support for blue carbon initiatives are also needed because coastal communities often directly interact with these ecosystems for livelihoods, fishing, tourism and protection from natural disasters. Engaging these communities ensures that conservation efforts are sustainable. Additionally, tapping into the knowledge and expertise of local communities about coastal ecosystems is essential for informed decision-making. 

Integrating carbon sequestration goals with other conservation and management objectives, such as sustainable fisheries and coastal resilience, is possible by empowering local communities to lead blue carbon initiatives. This can help ensure social equity, address economic opportunities and reduce conflicts over resource use.

Ultimately, garnering people’s buy-in for blue carbon solutions is essential for their effectiveness, sustainability and equitable distribution of benefits.

Considering marine sediment

Blue carbon “solutions” can be regarded as any intervention which aims to enhance the ocean’s natural capacity to store and sequester carbon.

As such, one might consider the management of commercial species and natural populations to increase the biomass of, and thereby carbon contained in, marine organisms. Managing interactions with the seabed can also be an important blue carbon solution.

Recent estimates suggest marine sediments are the largest store of organic carbon on the planet. Therefore, activities which disrupt them, such as bottom trawling or deep-sea mining, may be stirring up this sediment and leading to carbon being released back to the atmosphere. 

Although the full picture has yet to emerge, examining the impacts of where and how trawling is conducted allows us to make choices informed by all of the potential impacts. And before deep-sea mining activities are further scaled up, a more comprehensive understanding of their impacts is vital. 

The post Guest post: The role of ‘blue carbon’ in addressing climate change appeared first on Carbon Brief.

Guest post: The role of ‘blue carbon’ in addressing climate change

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As blue economy gathers pace, communities must benefit from ocean boom, activists say

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As governments and institutions pledged billions for offshore wind, cleaner shipping and marine protection at last month’s Our Ocean Conference in Mombasa, countries are increasingly turning to the ocean as a source of jobs and climate action.

But civil society groups warn that the push to expand the “blue economy” may reproduce familiar inequalities unless coastal communities have a greater say in how projects are designed, financed and governed.

Neville van Rooy from The Green Connection in South Africa, which works with coastal communities who rely directly on the ocean for their livelihoods, said local people were frequently unaware of proposed developments until civil society groups alerted them.

“Communities need to be taken seriously,” van Rooy told delegates at the Mombasa conference held on the shores of the Indian Ocean.

“Just because they are often struggling does not mean they do not have a vision of development. Inclusivity needs to be at the centre and development pathways must build on communities’ own experience, including indigenous knowledge systems rooted in harmony with nature.”

    Ocean investment flowing in

    The value of the blue economy—the sustainable use and protection of marine resources—doubled from $1.3 trillion in 1995 to $2.6 trillion in 2020 and is projected to quadruple by 2050, according to the Organisation for Economic Co-operation and Development (OECD).

    The scale of ambition in Mombasa was clear, with governments, institutions, companies and civil society groups announcing 320 commitments worth $6.4 billion.

    The largest share went to sustainable blue economy projects, with 86 commitments worth $2.86 billion, followed by sustainable fisheries with $1.75 billion and ocean-climate action with $1.18 billion.

    The pledges included support for ocean startups in Africa, coastal ecosystem restoration across the Indian Ocean, marine research and policy, recycling discarded fishing nets, sustainable livelihoods in Timor-Leste and planning tools for offshore wind.

    Cynthia Barzuna, global deputy director of the Ocean Program at the World Resources Institute, said there are signs that blue finance and ocean planning are moving closer to coastal communities, particularly through the development of sustainable ocean plans.

    In 2020, a group of 14 countries – co-led by Australia and Chile – pledged to manage their oceans sustainably, by jointly drawing up plans with coastal communities to shape how marine resources are managed and where investments should go.

    “Once communities are involved in the planning, bring in their knowledge, and participate in designing, developing and implementing a sustainable ocean plan, it puts us on the right path,” Barzuna told Climate Home News on the sidelines of the conference.

    Yet some of those countries – including Kenya, Australia and Mexico – have embarked on a new wave of offshore oil and gas projects, threatening key biodiversity hotspots, according to a recent report by a group of environmental NGOs.

    When projects go wrong

    Civil society groups say lessons need to be learnt from failed blue economy projects too.

    In Kenya, a proposed coal-fired power plant at Lamu Port – a fragile coastal ecosystem and a UNESCO World Heritage site – was challenged by residents and campaigners who cited little consultation and threats to fishing, tourism, culture and public health.

    In 2019, Kenya’s National Environment Tribunal revoked its environmental licence, citing inadequate public participation and flaws in the environmental assessment – a decision later upheld by the courts.

    “It is not enough to say that whatever you are doing is in the name of the communities, their livelihoods and whatever else you want to improve”, but that they should be directly involved in projects from the start, said Omar Elmawi, a Kenyan climate activist and Convenor of the Africa Movement of Movements. 

    He said another lesson learnt was that environmental impact assessments must not only be completed, but “must be done rigorously” and that the process has to be transparent so that people feel involved and that their views are being counted.

    Blue transition

    Blue carbon schemes can also attract finance, but campaigners said communities that have long protected mangroves, seagrasses and salt marshes must be treated as rights-holders, not just beneficiaries. In some past projects, they said, communities were asked to provide labour, attend consultations or receive small payments, while outside developers retained control over carbon revenues and decisions over how ecosystems were managed.

    Similarly, offshore wind and marine protected areas can bring climate and conservation gains, but if poorly planned, they can disrupt fishing grounds, marine species and small-scale fishers’ access to the sea, added campaigners.

    Farida Aliwa, executive director of Natural Justice, said the answer was not to halt ocean-based development, but to put in place stronger safeguards before projects are approved, financed and expanded.

    Aliwa said legal frameworks across Africa were evolving, with strategic litigation increasingly being used to hold governments accountable for environmental, climate and human rights impacts related to new projects.

    But she warned that communities and coastal defenders still face shrinking civic space, and said any shift to renewable energy must be designed responsibly.

    “As we work on alternatives, we need to ensure that renewable projects benefit communities,” she said.

    The post As blue economy gathers pace, communities must benefit from ocean boom, activists say appeared first on Climate Home News.

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    AI governance debate silent on risks to nature, campaigners warn

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    As countries gathered in Geneva this week for the first UN dialogue on the governance of artificial intelligence, campaigners said the debate around the fast-evolving technology has overlooked the potential harm it could cause to nature and biodiversity.

    Not only has nature been absent from discussions on the environmental impacts of AI data centres, which focus mainly on carbon emissions and water use, there has also been no consideration of how AI deployment by industry could gobble up more natural resources, activists warned.

    Brian O’Donnell, director of the Campaign for Nature, said that while AI can help protect wildlife and forests, the broader boost it will give to economic growth poses a far bigger threat than expected benefits.

    “We’ve seen over $250 billion of private capital go into AI in 2024 alone – and almost all of that is seeking an economic return, and the money follows commercial value,” he told journalists. “Extraction, industrial farming, resource logistics, and the engines that drive ever more consumption are all activities that contribute to biodiversity loss.”

      The leading conservationist added that the policy documents produced by leading AI companies do not address the downstream effects of their technology for nature and biodiversity, focusing more on employment and other social issues.

      Some have firms have put small sums towards projects that support conservation, he noted, but none are addressing the issue in a serious way or have included nature in the safety rules for their models.

      “The living world that all of this rests upon – nature being the foundation of our economies, our societies, all life on earth – is not a primary concern in the governance of AI, as proposed by the corporates of AI,” O’Donnell said.

      Positive uses steal the show

      Last month, UN chief António Guterres launched an initiative to hold major AI firms accountable for their exploding environmental impacts, including carbon emissions, the amount of water and land used for data centres, and the energy they consume.

      The UN boss also wants big players to commit to power all data centres with renewable energy by 2030. On Monday in Geneva, in a wide-ranging speech, he again raised his proposed “AI Environmental Transparency Initiative”. But nature has not featured in his comments on the issue.

      UN asks AI companies to reveal full environmental impacts

      In addition, the preliminary report of the newly formed Independent International Scientific Panel on AI – which assesses the opportunities, risks and impacts of AI – mentions environmental concerns only briefly.

      The report, which examines available scientific evidence and was presented to governments at the Geneva dialogue, does not highlight any threats to nature and biodiversity but cites a study showing how AI has been used to track and reduce conflict between humans and wildlife.

      O’Donnell pointed to “some really important technological uses of AI for biodiversity” such as monitoring species, forest damage and tree cover and using camera traps to see what kind of wildlife migrates in a particular area. But, he added, these get a disproportionate amount of attention compared with the threat from more rapacious resource extraction which he perceives as far greater.

      By making commercial operations cheaper, quicker and more efficient, and opening access to untapped areas of land and sea, AI could drive biodiversity loss through increased over-exploitation of fish, wildlife and timber, worsening pollution and spreading invasive species on faster trade networks, he added.

      Indigenous concerns

      Indigenous peoples are also worried that their lands, critical mineral reserves and knowledge will be appropriated by AI and the accelerated economic development it fuels, said Hindou Oumarou Ibrahim, a leading global environmental activist and Indigenous leader from Chad.

      Ibrahim, who produced a report on Indigenous peoples and AI for the UN in April, told journalists that before Indigenous peoples share their know-how on managing forests and stewarding nature, companies and governments must put in place principles to ensure this can happen in a fair way that prevents it being abused by bad actors.

      Warning against ‘consumer club’ as G7 forms critical minerals alliance

      Her report also points to positive ways that AI can support Indigenous culture and rights, such as tackling their lack of access to digital tools, preserving their languages and knowledge and mapping their territories to detect threats and better protect biodiversity.

      Efforts such as those by the UN to shape the future of AI governance should look not only at what AI can do, but also ask who benefits and how it safeguards the planet, Ibrahim said.

      “If we answer those questions together with Indigenous peoples as equal partners, we can build AI that serves humanity, protects biodiversity and help restore the balance between peoples and planet in an equitable and just way,” she added.

      Policy processes lag AI development

      Both O’Donnell and Ibrahim said they would lobby countries, the UN and AI firms themselves to put nature and biodiversity on the political agenda, including at the UN biodiversity summit in Armenia in October.

      O’Donnell told Climate Home News that when the Global Biodiversity Framework, the world’s main treaty to protect nature, was agreed in 2022, AI was still nascent but has since exploded in terms of investment and its influence on economies.

      The vote that stopped a data center: US communities query resource-hungry AI

      He pointed to the mismatch between the timeline of the UN’s efforts to develop governance guidelines and the speed with which AI is being developed in the real world.

      “Nature can’t be sidelined in these discussions,” he said, calling for a faster and more comprehensive response from policymakers, business and the environmental community.

      “We have a very short window to embed nature both into the governance constitutions of the companies themselves and into the formal regulatory [system] going forward,” he added.

      The post AI governance debate silent on risks to nature, campaigners warn appeared first on Climate Home News.

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      Ugandan farmers launch UK court case against East African oil pipeline

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      Four Ugandan farmers filed a case with London’s High Court on Tuesday, aiming to stop the East African Crude Oil Pipeline (EACOP) from starting to operate by asking the court to apply Uganda’s laws against the project’s UK-registered company.

      The controversial 1,443-kilometre (897-mile) pipeline, majority-owned by French energy company ​TotalEnergies, aims to carry crude from Ugandan fields for export through neighbouring Tanzania. About 80% has been built so far, according to its developers.

      The pipeline’s first oil exports are expected as soon as October, according to its developers, and the campaign group Avaaz, which is backing the farmers’ crowdfunded lawsuit, called it “one final chance to stop one of the worst oil pipelines on the planet”.

      The claim, filed by London law firm Leigh Day, argues that EACOP Ltd’s role in developing and operating the pipeline breaches Ugandan laws that protect citizens’ right to a clean and healthy environment.

        One of the claimants, Racheal Tugume, told a press conference she had been displaced from her land due to the pipeline’s construction, which she said had damaged local rivers, wildlife and ecosystems that communities depend on for their livelihoods just as erratic weather linked to climate change takes an increasing toll.

        “I am very happy that there are people in countries like the UK who are listening to us, who are behind us and who have come to support us,” Tugume said, adding that she hoped the case would bring justice to communities affected by the pipeline.

        Ugandan law in UK court

        While the pipeline is a joint venture led by TotalEnergies, with smaller stakes owned by Ugandan, Tanzanian and Chinese national oil firms, it is operated by EACOP Ltd, a company registered to an office in London’s Canary Wharf financial district.

        EACOP Ltd did not respond to a request for comment.

        The claim appears to be the first attempt to have Uganda’s climate and environmental protections enforced in a foreign court, partly reflecting concerns over whether cases challenging the multibillion-dollar pipeline would get a fair trial in Uganda.

        Ugandans living near new oil pipeline let down by compensation programmes

        Concerns about access to a fair hearing are among the issues the court will consider when deciding if it should take on the case, said Matthew Renshaw, partner at Leigh Day.

        Renshaw said that precedents including the Nigerian oil pollution case against Shell have shown that claims against British-registered companies for harms overseas can be successfully fought in UK courts.

        “We are proud to represent the four brave principled individuals,” Renshaw said.

        Constitutional protections

        The pipeline project has already been subject to repeated lawsuits in several countries, none of which have succeeded. A climate lawsuit filed in Uganda more than a decade ago by a group of young people has yet to conclude. Another at the East African Court of Justice, brought by campaign groups against Uganda and Tanzania, was rejected on procedural grounds last November.

        A separate ongoing lawsuit in TotalEnergies’ home country of France – a refiled version of an earlier failed claim – cannot stop EACOP going ahead, but it does seek damages from TotalEnergies for affected communities.

        With the newly launched case, Leigh Day’s legal adviser Marc Willers said the claim draws on specific Ugandan laws in a bid to stop EACOP’s operations.

        Uganda may see lower oil revenues than expected as costs rise and demand falls

        These include the Ugandan constitution, a 2019 environmental law and the National Climate Change Act 2021, which gives Ugandans the right to bring a case before a court in circumstances where anyone or any entity threatens the country’s ability to mitigate climate change.

        Stopping a “carbon bomb”

        The pipeline, which will link Uganda’s Lake Albert oil fields to Africa’s east coast in Tanzania, has already displaced thousands of people and cuts through the Lake Victoria basin, one of East Africa’s major freshwater systems and a critical water source for around 40 million people.

        According to the BankTrack non-profit, when the pipeline is at peak production, it will carry 216,000 barrels of crude oil per day and release over 33 million tonnes of carbon emissions each year. Over its full lifetime of 25 years, it is estimated to release about 379 million tonnes of greenhouse gas emissions across its value chain including construction, refining and product use.

        A May 2026 report from Earth Insight also warns that the pipeline and related infrastructure could affect 158 wetlands in Uganda, 11 rivers, 44 protected areas and seven key biodiversity areas while disrupting about 2,000 square km of protected wildlife habitats.

        This is why the primary focus of the UK court case is to stop the operation of the pipeline in its tracks, Leigh Day’s Willers said, calling it a “carbon bomb” that would worsen the world’s climate crisis.

        Long wait for first hearing

        While the purpose of the case is to stop the pipeline from launching operations, Renshaw said it could take about 12 months before the case gets a first hearing and about 18 months before it goes to trial.

        Billions unlocked as Green Climate Fund agrees to spend more and save less

        The farmers are, however, seeking an injunction to stop EACOP Ltd from proceeding with operations. In the event that shipments begin, the lawsuit will still seek to stop the pipeline from then on, Renshaw said.

        “We will be doing what we can to expedite matters but it is possible that EACOP will have started operating the pipeline before the claim is heard. If that is the case, the claim would intend to halt operations from that point. For example, the pipeline may operate for just one year rather than 30-plus, resulting in far less harm,” he said.

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