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.
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.
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
More of Germany’s electricity came from wind and solar power than fossil fuels for the first time ever in 2025.
Together, wind and solar power generated 225 terawatt hours (TWh) of electricity – accounting for 44% of the total in 2025 – with just 217TWh (43%) coming from fossil fuels.
Solar and onshore wind have grown rapidly under Germany’s “Energiewende” strategy over the past two decades, as the nation transitions away from both coal and nuclear power.
Renewables have recently faced mounting opposition from the far-right Alternative for Germany (AfD) party and the current coalition government has been trying to develop new gas-power plants.
Nevertheless, Carbon Brief analysis of Energy Institute data – shown in the chart below – illustrates how wind and solar have continued growing, emerging as the nation’s largest power source.
The success of renewables in Germany mirrors the EU as a whole, which also saw wind and solar overtake fossil-fuel power generation in 2025 for the first time.
Germany has various targets in place that require a rapid expansion of wind and solar power, including cutting economy-wide emissions to net-zero by 2045.
The nation is also aiming to increase renewables’ share of electricity consumption to 80% by 2030 to achieve a “largely climate neutral” power system by 2035. It aims to decarbonise its electricity entirely once coal power has been phased out, which has a deadline of “no later than” 2038.
(The renewables targets also include electricity generated from hydropower and bioenergy. The latter produces a relatively large share of Germany’s power – roughly a tenth in 2025.)
Germany has to rely on renewables more than neighbours, such as France and the UK, to achieve its climate goals. This is due to its phaseout of nuclear power, which is a key part of the “Energiewende” strategy.
Nuclear power has long faced widespread public opposition in Germany. This year, the centre-right chancellor Friedrich Merz described the nuclear phaseout as a “strategic mistake”, but the government has ruled out a return to conventional nuclear power.
The country has an official coal phaseout date of 2038, but experts say the country is on track to eliminate coal from its power supply years earlier. This is despite some pressure to temporarily slow the transition away from coal during the recent energy crisis.
(Very few outside the AfD are calling to scrap the coal phaseout altogether, but the government will publish a review of the timelines in August.)
While coal generation has fallen quickly, even as nuclear was being phased out, some argue that coal could have been cut more quickly if nuclear had remained.
Gas-power expansion has also been framed by the government in recent years as an essential component of Germany’s transition away from coal and nuclear power, to support a renewables-heavy grid.
The current government under Merz has tried to boost gas and recently adopted a law to provide state support for new gas-fired power plants. The plan is for these plants to be converted to run on “green hydrogen” by 2045, in order to meet the climate-neutrality goal.
Germany aims to install 115 gigawatts (GW) of onshore wind by 2030 and approved a record 20.8GW of new capacity in 2025.
Meanwhile, solar generation has reached unprecedented levels during the hot summer of 2026.
However, the government’s planned grid reforms have been criticised by the renewables industry for risking slowing down the energy transition. Under the proposals, renewables developers would only be granted automatic grid connections in areas with limited grid capacity if they waive compensation for future curtailed generation.
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The post Analysis: Wind and solar power overtake fossil fuels in Germany for first time ever appeared first on Carbon Brief.
Analysis: Wind and solar power overtake fossil fuels in Germany for first time ever
Climate Change
Analysis: 84% of nations miss deadline to identify ‘nature-harming’ subsidies by 2025
Most countries failed to meet a 2025 target to identify all of their subsidies that could be “harmful” to biodiversity, according to Carbon Brief analysis.
The findings also reveal that 32 countries spend an estimated $270bn on biodiversity-harming subsidies and other incentives each year.
This is the “tip of the iceberg”, one expert notes, with “trillions” spent globally.
In 2022, almost every country in the world agreed on a set of “goals” and “targets” aiming to halt and reverse biodiversity loss by 2030.
One of these targets asked countries to identify all subsidies that damage biodiversity by 2025, before phasing out or reforming at least $500bn of these incentives by 2030.
The subsidies can be found in a range of sectors, including fossil fuels, agriculture, forestry, mining and fishing.
Just 21 countries appear to have met the 2025 goal, Carbon Brief finds, based on analysis of 134 national reports submitted to the UN Convention on Biological Diversity (CBD) by 1 July 2026.
Five of the world’s 17 megadiverse countries were among those that met the deadline.
Country progress
Carbon Brief’s analysis looks at the number of countries that have met the 2025 target to identify their use of nature-harming subsidies.
However, the metrics to determine which countries have “met” this target are not explicitly defined.
Carbon Brief included any country that says it has completed the process of identifying its subsidies. In almost every case, these countries also included a total figure for the value of those subsidies.
The analysis finds that 21 countries say they have identified their harmful subsidies, as shown in the map below (yellow). This amounts to 16% of the countries that have submitted national reports so far.
A further 11 countries, plus the EU, have provided figures for some of their subsidies, such as only those in a specific sector (dark blue).
Of the 134 national reports submitted to the CBD, 66 make reference to beginning the process (medium blue), while the remaining 68 do not (light blue). The final 62 countries party to the CBD have yet to submit a national report (light grey).
(Every country in the world participates in the CBD, except for the US and the Holy See – the governing body of the Catholic church, which is seated in Vatican City.)
The 32 countries that have identified some or all subsidies spend almost $270bn on nature-harming incentives annually, according to Carbon Brief’s analysis.
This is based on a tally of the figures for the most recent available year listed in countries’ national reports, in US dollars using conversion rates at the end of the given year and adjusted for inflation. The analysis also includes figures from other reports cited in the country submissions.
The $270bn reported in country submissions to date is “just the tip of the iceberg”, notes Eva Zabey, the chief executive of Business for Nature. The global figure could be as high as $1.8tn, according to a 2022 estimate from non-profit group, the B Team.
The figures identified by Carbon Brief are a “warning” that the “world is not moving fast enough” to tackle harmful subsidies, Zabey says, adding:
“The positive news is that some countries have shown it can be done and this should embolden others to follow suit…Subsidy reform should be treated as an economic necessity, not an environmental checklist.”
Harmful subsidies are expected to be among the key priorities at the upcoming COP17 UN nature summit, being held in Armenia in October 2026.
Subsidy target
There is no single definition of a “harmful” subsidy. (See: ‘Harmful’ subsidies.)
The aim to identify these subsidies stems from target 18 of the Kunming-Montreal Global Biodiversity Framework (GBF) – the global agreement containing a series of goals and targets for nature.
Target 18 calls on countries to identify subsidies and other incentives that are harmful for biodiversity by 2025.
It also says that nations should “eliminate, phase out or reform” these subsidies in a “proportionate” way, reducing them by at least $500bn per year by 2030.
It says countries should first target the “most harmful” incentives, while simultaneously scaling up positive incentives for nature.
All 2030 targets in the GBF are global – with countries each expected to outline how they will contribute nationally. So far, 169 countries have submitted these national targets.
Only 38% of countries addressed the 2025 aim to identify harmful subsidies in their national targets “to some extent”, according to a draft version of an upcoming progress report.
Countries’ national reports do not “provide a sufficient basis to determine” whether the 2025 milestone was met, says the report, but available evidence “suggests” that it was not.
‘Harmful’ subsidies
There is no universally agreed-upon definition of a “biodiversity-harmful subsidy” – or how it differs from an environmentally harmful subsidy.
In general, “harmful” environmental subsidies impact humans’ surroundings, whereas those harmful to biodiversity directly affect species and ecosystems. Paul Elton, a PhD candidate at the Australian National University, tells Carbon Brief:
“If you were to do a study that focused on biodiversity-harmful subsidies versus one that focused on environmentally-harmful subsidies, there’d be a Venn diagram where a large percentage would overlap.”
A 2022 working paper on identifying subsidies harmful to biodiversity published by the Organisation for Economic Co-operation and Development (OECD) depicted biodiversity as a subset of the environment, with climate and air falling outside the scope of “biodiversity”.
However, the report also noted that climate change is one of the five key drivers of biodiversity loss, adding:
“As such, subsidies that lead to larger greenhouse gas emissions, for example, will also indirectly impact on biodiversity.”
Prof Jessica Dempsey, a political ecologist at the University of British Columbia, tells Carbon Brief that she would “absolutely” consider fossil-fuel subsidies to be biodiversity-harming – not only as a driver of climate change, but also because the extraction of fossil fuels can cause localised harms to biodiversity. She adds:
“I do think probably it is true that all harmful subsidies are not necessarily biodiversity-related. Some care in that is important, but subsidies to the sectors that are known drivers of biodiversity loss feel very obvious to me.”
Biodiversity-harming subsidies can be either direct or indirect.
Direct subsidies refer to government expenditures that go towards a project that harms nature, such as construction of a new gas-fired power plant. Indirect subsidies could include tax exemptions that encourage a certain behaviour, such as lower tax rates on fuels for agricultural machinery.
Subsidies in agriculture, fishery and energy sectors are most commonly deemed “harmful”, but damage can also be caused by support for forestry, infrastructure, transport, construction, water and other sectors.
One recent estimate of the global total of biodiversity-harming subsidies put the figure at $1.7-3.2tn annually. An estimate of environmentally harmful subsidies put the figure at $2.6tn.
Elton tells Carbon Brief:
“It’s useful to contextualise the $500bn ambition of the GBF against those global estimates of how big [the total] actually could be, because that underscores the fact that so far, you’ve only got a subset of nations reporting about $250bn by your analysis, which is only half of the [phase-out target].
“It’s a significant lack of accountability.”
The chart below compares the $2.6bn estimated value of harmful subsidies to the $500bn phase-out target set in the GBF and the value of the subsidies identified so far in national reports.
Sectoral breakdown
Many subsidies can have both negative and positive impacts on biodiversity, according to the 2022 OECD working paper.
A subsidy on constructing dams for new hydropower can harm local biodiversity by disrupting water flows and flooding certain areas, for example. But it also reduces fossil-fuel dependence, lowering emissions and leading to a decrease in global warming.
Ronald Steenblik, a subsidies expert and co-author of the report estimating $2.6bn of harmful subsidies, tells Carbon Brief:
“What’s harmful is somewhat in the eye of the beholder.”
Most experts agree that a few sectors receive the bulk of the world’s biodiversity-harming subsidies: fossil fuels, agriculture and infrastructure, with much smaller contributions from other sectors, such as forestry, mining and fisheries.
Of the subsidies reported to the CBD, almost half were for the fossil-fuel sector, and around one-quarter for agriculture and fishing.
Dempsey says it is “surprising” that mining “didn’t show up” in these figures. (Of the 32 countries that provided subsidy data, only one mentioned mining as an industry that received harmful subsidies.)
Limitations
One limitation of Carbon Brief’s analysis is the lack of standardisation of subsidy data.
The methodology underlying the national reports lists several definitions of environmentally harmful subsidies, adding:
“[T]here is no standardised, globally agreed methodology for assessing the value of subsidies…nor is there a single global dataset providing this information.”
It adds that it is “important” for countries to identify harmful subsidies “within their national context”. Steenblik says:
“When you get down into the details, you can have lots of arguments of where you draw the line. And, so, the big question on this spreadsheet is where countries drew that line.”
For example, China’s national report says the country has already identified all biodiversity-harming subsidies and reformed them entirely.
In Australia, a 2026 study – led by Elton from Australian National University – identified biodiversity-harmful subsidies worth $26.3bn over 2022-23, a number that amounts to just over 1% of the country’s GDP.
However, in its national report, Australia identified $155m worth of subsidies, largely in the agricultural sector. (The national report says that the identified agricultural subsidies are those that are “potentially most harmful to the environment”.)
Elton tells Carbon Brief that this discrepancy underscores the necessity of an independent assessment of harmful subsidies, “rather than this just being seen as a tick-the-box reporting exercise by officials in the environment department”.
When it comes to actually phasing out harmful subsidies, Dempsey says, focusing on the quality of the subsidy – and who benefits from it – is just as important as focusing on the numbers. She adds:
“If we don’t take this lens of understanding the beneficiaries and we only focus on the [numbers], we really risk having policy changes that then lead to increased affordability problems for everyday working people, and backlash.”
Methodology
Carbon Brief analysed national reports submitted to the CBD by 134 parties – 133 countries and the EU – to assess which ones had identified all of their biodiversity-harmful subsidies and therefore met the 2025 deadline.
The reports were submitted in 2026, with the analysis including those submitted by 1 July 2026.
The figures for each country can be found in this spreadsheet. More than three-quarters of reports did not list any figures.
To get the full tally for the amount listed, Carbon Brief used the figures for 2025 (or the nearest available year) and converted the local currency into US dollars, based on conversion rates in the given year using the currency exchange rates calculator from the US Treasury.
These figures were then adjusted for inflation to the year 2025. Numbers were rounded to the nearest $1,000.
In total, this amounted to $269,856,769,000 in subsidies across 32 countries.
Many countries listed the sector that each subsidy is going towards. Carbon Brief standardised these inputs using the following categories:
- Agriculture and fishing
- Energy
- Forestry
- Fossil fuels
- Infrastructure
- Transport
- Other
- Multiple sectors
“Multiple sectors” was assigned when a country provided only a partial sectoral breakdown of their subsidies or none at all.
“Other” was selected to encompass sectors that were named more infrequently, including water, mining, tourism and construction.
The designations employed and the presentation of the material on the map in this article do not imply the expression of any opinion whatsoever on the part of Carbon Brief concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.
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The post Analysis: 84% of nations miss deadline to identify ‘nature-harming’ subsidies by 2025 appeared first on Carbon Brief.
Analysis: 84% of nations miss deadline to identify ‘nature-harming’ subsidies by 2025
SYDNEY, Monday 27 July 2026 — In response to an announcement that Woodside’s Browse to North West Shelf (Browse) Project was declared a State Significant Project by the WA Government, the following comments can be attributed to Senior Campaigner at Greenpeace Australia Pacific, Hannah Schuch:
“The WA Government must not ignore the significant risks clearly associated with Woodside’s plans to drill for gas at the pristine Scott Reef — to endangered marine life, our oceans, and our climate — all of which are valued and relied upon by Western Australians.
“The WA Environmental Protection Authority has already found Woodside’s plans to drill at Scott Reef would have unacceptable impacts on the environment without considering the climate impacts of 1.6 billion tonnes of carbon pollution associated with this disastrous proposal.
“Woodside’s gas drilling plans, including seismic blasting and carbon dumping in the heart of a precious ecosystem, pose potentially fatal risks to pygmy blue whales and genetically unique green sea turtles, and could cause a catastrophic oil spill.
“If the WA and federal governments are concerned with the prosperity of WA, they must reject Woodside’s nature and climate-wrecking proposal to drill for gas at Scott Reef.”
—ENDS—
High res images and footage of Scott Reef can be found here.
For more information or to arrange an interview, please contact Emma Sangalli on 0431 513 465 or emma.sangalli@greenpeace.org
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