US president Donald Trump’s tariffs might only shave 0.3% off global carbon dioxide (CO2) emissions this year, according to Carbon Brief analysis.
While the Trump administration is setting back international climate action through policies such as the “one big beautiful bill”, some analysts have argued that his tariffs would inadvertently cut carbon by throwing sand into the engine of the global economy.
However, Carbon Brief’s analysis, based on changing projections of economic growth since the tariffs were announced, shows that this effect is likely to be very limited.
The slew of new tariffs – initially announced on 2 April, dubbed by the president as “liberation day” – might only knock 110-150m tonnes of CO2 (MtCO2) off global emissions in 2025 (0.3-0.4%), the analysis shows.
For 2026, the tariffs could have a slightly higher impact, but still only 190-300MtCO2 (0.5-0.8%).
Trump’s “liberation day” tariffs included a 10% universal levy on all imported goods, alongside additional “reciprocal tariffs” on a number of countries he claimed had “cheated” the US.
The announcement sent the world’s stock markets into “turmoil”. The move has hit a range of diverse industries, including steel and aluminium, oil and more.
Despite initially saying he had no plans to pause the tariffs, Trump announced on 10 April that he would pause them for 90 days.
This pause was set to come to an end on 9 July, but, just days before this, he announced a further extension to 1 August. On his social-media network, Truth Social, Trump said countries would receive “letters and/or deals” on tariffs in the interim.
More recently, he has signed tariff deals with the European Union and countries such as the UK, Japan, the Philippines and others.
These deals reduce the headline tariff rates relative to the “liberation day” situation, as well as typically including a range of carve-outs and exemptions.
However, they do not end uncertainty over tariff levels and still leave US import levies at their highest levels “since the 1930s”, reducing expectations for trade and growth.
Since returning to office at the beginning of 2025, Trump – a climate sceptic – has rolled back a large number of environmental policies and protections.
Most recently, his “one big beautiful bill” was passed on 4 July, bringing an end to a number of former president Joe Biden’s policies, such as the Inflation Reduction Act (IRA), which provided support for electric vehicles, clean-technology manufacturing and more.
In combination with other Trump administration policies, this means the US will breach its now-defunct emissions reduction for 2030 target by a cumulative total of 7bn tonnes of CO2, previous Carbon Brief analysis found.
Nevertheless, numerous people suggested that the economic damage from Trump’s tariffs could “unintentionally” lead to a drop in carbon emissions.
For example, an April 2025 article in the New York Times stated: “Trump’s economic approach may inadvertently reduce greenhouse gas emissions, as consumption slows in response to a global trade war.”
The piece noted that the “reprieve for the planet” was likely to be short-lived, with longer-term impacts potentially hitting clean-energy deployment as international supply chains are hampered.
Similarly, an April 2025 Associated Press article quoted Global Carbon Project head Prof Rob Jackson saying that tariffs “might help the climate in the first year or two”. However, it quoted him continuing that this would come at a high cost and might backfire:
“I would say it might help the climate in the first year or two if we have a downturn in economic activity or a recession, which no one wants. But it will hurt the climate long-term because tariffs impact clean tech more than most other industries because of trade with China.”
Carbon Brief’s analysis shows that the emissions impact, even in the short term, is expected to be minimal.
It assessed the expected emissions impact of reduced global GDP by looking at changes to GDP forecasts from the International Monetary Fund (IMF), Organisation for Economic Cooperation and Development (OECD) and the World Bank, before and after Trump’s tariffs announcements.
The OECD suggests the biggest impact from the tariffs, as shown in the chart below.
The medium- to long-term impact of Trump’s trade wars is expected to be negative for climate action. In a recent interview, UK climate envoy Rachel Kyte told Carbon Brief that it created uncertainty and was likely to slow down clean-energy investment. She said:
“Investment flows when everybody feels confident, right?…[I]f I don’t know if the tariff is 10%, 20%, 25%, 56%, whatever, well, let me put it off till the next quarter to make that investment decision.”
Kyte added: “It’s the hesitancy that it puts in the mind of government, but also in the mind of investors and the private sector…[T]he sort of tariff era we’re in, the risk is that it slows down the investment in the clean-energy transition at a time when it needs to speed up.”
Methodology
Carbon Brief estimated the impact of Trump’s tariffs on global GDP by comparing growth forecasts published during June and July 2025 by the IMF World Economic Outlook, OECD Economic Outlook and World Bank Global Economic Prospects against corresponding forecasts published in December 2024 or January 2025, before Trump’s tariff announcements.
While Trump’s tariffs are not the only factor to have changed in these forecasts over the time period in question, they do represent a singular and sudden effect, which would be expected to have a significant impact on the global economic outlook.
The analysis estimates global GDP over 2025/2026 by applying the growth forecasts to historical GDP from the World Bank.
The reductions in forecast global GDP growth are translated into estimated emissions impacts by assuming that the “carbon intensity” of the world’s economy continues to improve at a steady rate, with or without the tariffs. Carbon intensity is the emissions per unit of GDP and has been improving slowly and steadily over many years.
The analysis only considers CO2 emissions from fossil fuels and cement production. Historical CO2 emissions data is taken from the Global Carbon Budget.
The range of estimated CO2 impacts stems from the varying GDP forecasts of the three different organisations.
For comparison, the International Energy Agency (IEA) has revised down its forecasts for global oil demand growth in 2025 by some 350,000 barrels of oil per day since the start of the year. This is equivalent to cutting global emissions this year by 40MtCO2.
The IEA’s forecasts for global coal demand in 2025 are broadly unchanged since the start of the year, with demand expected to grow 0.2% this year.
The post Analysis: Trump’s tariffs could cut just 0.3% from global CO2 emissions in 2025 appeared first on Carbon Brief.
Analysis: Trump’s tariffs could cut just 0.3% from global CO2 emissions in 2025
As an extreme El Niño breaks marine temperature records, COP31 is set to boost the profile of the ocean’s role in solving climate change, but finance and clear conservation measures will be needed for it to move the needle, experts said.
The Turkish presidency has announced plans for an Antalya Ocean Declaration that recognises the centrality of the global ocean – the world’s largest carbon sink – in regulating the climate and minimising the now unavoidable overshoot of global temperatures above 1.5C over pre-industrial levels.
Meanwhile, as part of the formal UN negotiations, Australia has announced plans to land a cover decision in Antalya, which, according to veteran former US negotiator Sue Biniaz, would be the only section of the formal negotiations where the role of oceans could be included.
She added that an outcome at COP31 seems likely, given the initiative from both presidencies and a push from over 100 countries – including Brazil, the EU and the African Group of countries – calling for the UN negotiations to deliver a plan for implementing ocean measures.
Governments will arrive in Antalya with a “super El Niño” adding stress to marine ecosystems and expected to continue to intensify until December 2026, with parts of the Pacific averaging almost 30C (86F) – over 3C more than normal – in October, according to monthly EU sea temperature data.
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COP31 Briefing: What to expect from the Antalya climate summit?
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Nepal seeks stronger recognition of mountain issues in UN climate process
Flood-hit Nepal wants COP31 to adopt a new agenda item formalising work on mountains and climate change and boosting the response to rising risks
Needs for ocean conservation and funding
While elevating the ocean agenda is “critical”, it must lead to funding for ocean conservation and a clear plan for reaching the global target – set at UN biodiversity talks in 2022 – of protecting 30% of the global ocean by 2030, said Pradeep Singh, senior ocean governance expert at Oceano Azul Foundation.
The ocean is precisely where governments are farthest off track from meeting this target – informally known as the 30×30 goal. Even if countries meet all their nature conservation plans, only about 12% of the global ocean would be protected, the UN says.
“Acknowledgment of marine protected areas and the 30×30 target as climate infrastructures will certainly boost efforts and funding for science and management,” Singh told Climate Home News.
Shamini Selvaratnam, director of international climate and clean energy at Ocean Conservancy, said an ocean commitment that makes a difference in coastal communities “takes funding, local capacity and support that countries can actually access”.
An analysis by climate think tank Zero Carbon Analytics shows that investment in the blue economy – through activities like sustainable fisheries or cleaner shipping – is only at about 2% of the needs, which are estimated at $550 billion per year.
Following-through on commitments
Selvaratnam added that countries must also establish mechanisms to follow through on these measures, which currently only exists in the form of a non-binding dialogue that is not expected to produce any negotiated agreements.
She said that countries at COP31 must find ways for their ocean commitments to inform the next global stocktake, the UN’s five-yearly review of progress on climate action. Some countries – including African countries, Latin American nations, small island states and the European Union – have backed a process that culminates in the next global stocktake.
At climate negotiations, countries are not mandated to include ocean conservation measures in their climate plans. But a group of countries led by France and Brazil is pushing them to do so voluntarily through an initiative called Blue NDC Challenge. Seventeen countries have joined the initiative so far.
In its list of COP31 priorities, the EU has called for the “critical role” of oceans to be recognised, but falls short of calling for any specific actions to feature marine action more prominently in climate plans.
As part of their demands, ocean campaign groups have called for the establishment of an “Antalya Ocean Compact”, a platform where countries can coordinate efforts across different environmental treaties, including the UN climate, biodiversity and high seas negotiations.
Ultimately, Selvaratnam said a strong deal “must accelerate emissions cuts, clean energy, and a transition away from fossil fuels, including offshore oil and gas”.
Ilana Seid, chair of the AOSIS group of small island states and permanent representative of Palau to the UN, said during a press briefing last week that “meaningful progress” on emissions reduction is “the best way” to alleviate stress on the ocean.
The post ‘Blue COP31’ set to spotlight need for ocean protections amid record heat appeared first on Climate Home News.
‘Blue COP31’ set to spotlight need for ocean protections amid record heat
In the wake of its recent glacial flooding disaster, Nepal and the kingdom of Bhutan have proposed a new agenda item on mountains and climate change for the COP31 summit which opens on Monday in the Turkish city of Antalya.
In a submission addressed to the COP31 presidency and the head of the UN climate secretariat (UNFCCC), Nepal said the agenda item, entitled “1.5°C Warming in Mountains”, is an effort to strengthen the response of the international community to the climate risks facing the world’s mountain regions.
The item proposes that mountain issues should become a regular part of the formal UN climate change process, with a focus on scientific assessment of the risks associated with warming overshooting 1.5C, an annual high-level dialogue, a dedicated work programme and improved access to climate finance.
Maheshwar Dhakal, chief of the climate change management division of Nepal’s Ministry of Agriculture, Forests and Environment, told Climate Home News that Himalayan countries face similar problems such as collapsing glaciers and flooding from glacial lakes.
“We are trying to bring all Himalayan countries together under this agenda item,” he said.
COP31 Briefing: What to expect from the Antalya climate summit?
At this year’s UN General Assembly, Nepal’s Prime Minister Balendra Shah called for strong global action to ensure climate justice and proposed creating a Himalayan Climate Resilience Mechanism led by India, China and Nepal. It would share satellite data, monitor glacial slopes and lakes, strengthen early warning systems and coordinate cross-border disaster response.
Nepal has experienced significant infrastructure losses and human casualties from flooding every year since 2020. In late August, the collapse of a glacial slope on the border with Tibet caused a torrent of water and debris to course down the Bhote Koshi River, leaving more than 6,000 people dead or missing.
According to a government needs assessment, the disaster caused an estimated $2.7 billion in physical damage and economic losses, while around $4.8 billion will be required for recovery and reconstruction.
More research needed on threats
Although high mountain regions are known to be fragile ecosystems, especially as global warming accelerates glacier melt, the extent of their vulnerability is still not fully understood. When the devastating Bhote Koshi floods hit, it opened the eyes of the world to the risks.
Dhakal said the Bhote Koshi floods “have proved the impacts of climate change in the Himalayan region”, which were linked to rising temperatures by scientists with the World Weather Attribution group. “Therefore, Nepal wants scientific studies, research and political discussions on mountain climate risks to receive greater attention at international climate conferences,” he added.
Nepal has been making efforts on this front since 2009, when it held a cabinet meeting at Kalapatthar near Mount Everest. Since COP28 in Dubai, Nepal has organised high-level events and dialogues on mountain issues at COPs and is co-hosting one at COP31 with Bhutan, Pakistan, Kyrgyzstan and Tajikistan.
Editor’s Desk: Nepal’s disaster has laid bare the world’s adaptation accountability gap
Dhakal said the dialogues held so far have raised awareness, but mountain concerns must become part of the formal UN climate process to unlock climate finance and technical support that can bolster countries’ capacity to tackle climate threats.
If specific indicators and priorities are developed for mountain regions, vulnerable developing countries like Nepal would have better access to finance to help them adapt to the climate warming they have done very little to cause, he added.
More detailed data would enable them to prepare stronger project proposals for international climate funds, including the Green Climate Fund (GCF). In 2025, the GCF backed a project to protect livelihoods from climate-induced flooding in Nepal but it took seven years to get approval.
Sindhu Dhungana, an alternate board member at the GCF, said the problem is becoming more widespread and urgent for the Hindu Kush Himalaya region.
“The economies, cultures and almost everything in Himalayan countries depend on mountains,” he explained. “For us, climate change is mountain change… [it has] affected everything, including the economy and biodiversity.”
Destroyed development projects
Nepal wants the UN climate process to address mountain risks both before and after disasters. Countries need better research, technology, early warning systems and other adaptation measures to protect people and infrastructure. But even when countries take precautions, loss and damage is likely to occur and will require international support to address it.
Nepal has been provisionally allocated $21.6 million from the United Nations’ new Fund for Responding to Loss and Damage (FRLD) to help with the aftermath of the Bhote Koshi disaster, but this is just a fraction of needs and the money will come only months after it made an initial request.
Dhakal pointed to the damage caused by floods to infrastructure built with loans, such as the Melamchi Drinking Water Project, which received $312 million from the Asian Development Bank but was destroyed by a major flood in 2021, shortly after it began operating. The recent Bhote Koshi disaster wiped out a dozen hydropower facilities, as well as solar energy systems.
Nepal flood destruction shows “limits to adaptation”, scientists say
Nepal wants international discussions on what should happen when climate-related disasters destroy development projects built using credit, and how the loans should be treated afterwards.
“Climatic disasters wash out… projects, but the burden of loan is still paid by Nepal,” Dhakal said.
For now, it remains unclear whether the opening session of COP31 will consider or adopt the proposed agenda item on mountains and climate change, with consultations on how to respond still underway among governments and the COP31 co-presidencies.
“If countries agree to discuss the proposal and include it in the agenda, that would be another step forward,” Dhakal said. “Further discussions in the coming years could gradually give the mountain agenda a stronger shape.”
The post Nepal seeks stronger recognition of mountain issues in UN climate process appeared first on Climate Home News.
Nepal seeks stronger recognition of mountain issues in UN climate process
Some governments have backed using Brazil’s voluntary roadmaps on fossil fuels and deforestation to inform the next UN assessment of global climate action, a key process that concludes in 2028, the COP30 presidency told Climate Home News.
Brazil published the roadmaps on transitioning away from fossil fuels and on halting deforestation by 2030 this week, after failing to secure an agreement in Belém to make them part of formal negotiations. The documents set out a menu of policies countries could use to start acting on both issues straight away.
At their launch, Brazilian top climate officials argued the roadmaps could feed into the second stocktake negotiations. Through that process, due to start at this year’s COP, countries are meant to take stock of collective progress on climate action and decide on a plan to ramp up ambition in future policies.
In an interview with Climate Home News in London, COP30 president André Corrêa do Lag