Global carbon dioxide emissions from fossil fuels and cement have increased by 1.1% in 2023, hitting a new record high of 36.8bn tonnes of CO2 (GtCO2), according to the 2023 Global Carbon Budget report by the Global Carbon Project.
The new report finds that the increase in fossil emissions in 2023 has been largely driven by increased emissions in China – without which the global total would have remained approximately flat at 2022 levels.
Total global CO2 emissions – including land use and fossil CO2 – increased by approximately 0.5% in 2023, driven by a combination of a small drop in land-use emissions, but an increase in fossil CO2 emissions.
However, total CO2 emissions remain ever so slightly below the highs set in 2019 and have been relatively flat since 2015.
The 18th edition of the Global Carbon Budget, which is published today, also reveals:
- Global land-use emissions have likely been falling over the past two decades, driven by decreasing rates of deforestation in Brazil and other countries. However, land-use emissions remain highly uncertain and trends should be interpreted with caution.
- Most of the increase in fossil emissions was from coal and oil. Global coal emissions reached a new record high, though oil emissions still remain below pre-pandemic levels. Gas emissions and those from cement and other sources remained relatively unchanged.
- China’s fossil CO2 emissions are estimated to be up 4% this year, while India’s are up 8.2%. US and European Union emissions are expected to fall by 3% and 7.5%, respectively.
- Emissions from international aviation and shipping have grown by an estimated 11.9% in 2023, reflecting a 28% increase in aviation emissions (as the sector continues to recover from pandemic lows) and a 1% increase in shipping emissions.
- Global CO2 concentrations in 2023 set a new record of 419.3 parts per million (ppm), up 2.4ppm from 2022 levels. Atmospheric CO2 concentrations are now 51% above pre-industrial levels.
Global CO2 emissions virtually tie 2019 record
While CO2 emissions from fossil fuels have exceeded pre-pandemic levels over the past two years, total CO2 global emissions – which includes those from land-use change – have remained marginally below 2019’s record of 40.9GtCO2.
In 2023, the global total effectively tied the 2019 record. The central estimate provided by the Global Carbon Budget is 0.1% lower than the prior record, though the large uncertainties – particularly for land-use change emissions – reduces confidence in the relative ranking of the two.
Each year the Global Carbon Budget is estimated to include the latest data as well as improvements to modelling sources and sinks, resulting in some year-to-year revisions to the historical record.
The figure below shows the 2023 (dark blue solid line), 2022 (yellow dotted), 2021 (bright blue dotted) and 2020 (red dotted) global CO2 emissions estimates, along with the uncertainty (shaded area) of the new 2023 budget.
The 2023 figures are quite similar to the 2022 numbers over the past decade, though it shows somewhat higher emissions during the 1980s and 1990s.
Annual total global CO2 emissions – from fossil and land-use change – between 1959 and 2023 for the 2020, 2021, 2022 and 2023 versions of the Global Carbon Project’s Global Carbon Budget, in billions of tonnes of CO2 per year (GtCO2). Shaded area shows the estimated one-sigma uncertainty for the 2023 budget. Data from the Global Carbon Project; chart by Carbon Brief.
Growth in total CO2 emissions has substantially slowed down over the past decade (2013-22), with an average growth of 0.14% per year. This is much lower than the 2.1% per year average growth rate over the previous decade (2003-12) and the longer-term average growth rate of 1.7% between 1959 and 2012.
The continued growth in fossil-fuel emissions has been largely counterbalanced by a slight decline in land-use emissions. However, the uncertainties surrounding land-use emissions remain quite large. As more data is collected there may be upward or downward revisions in the record over the past decade – as seen in both 2021 and 2022 versions of the Global Carbon Budget.
The figure below breaks down global emissions (black line) in the 2023 budget into fossil and (grey) land-use (yellow) components. Fossil CO2 emissions represent the bulk of total global emissions in recent years, accounting for approximately 90% of emissions in 2023 (compared to 10% for land-use). This represents a large change from the first half of the 20th century, when land-use emissions were approximately the same as fossil emissions.
Global fossil emissions include CO2 emitted from burning coal, oil and gas, as well as the production of cement. However, the Global Carbon Budget also subtracts the cement carbonation sink – CO2 slowly absorbed by cement once it is exposed to the air – from fossil emissions in each year to determine total fossil emissions.
Global CO2 emissions separated out into from fossil and land-use change components between 1959 and 2023 from the 2023 Global Carbon Budget. Note that fossil CO2 emissions are inclusive of the cement carbonation sink. Data from the Global Carbon Project; chart by Carbon Brief.
Recent analyses by both the International Energy Agency (IEA) and Climate Analytics have suggested that global fossil emissions may peak in 2023, as the growth of clean energy accelerates and fossil fuel use declines.
However, hopes for an imminent peak in global emissions should be tempered by past failed predictions. Back in 2016, there were suggestions that global emissions had peaked and would decline. Similarly, a number of researchers (including one of the authors of this article) estimated that fossil emissions would peak in 2019 in the wake of Covid-19 disruptions. In reality, fossil emissions set new records in both 2022 and 2023.
It is also important to emphasise that stopping the growth of CO2 emissions does not stop CO2 from accumulating in the atmosphere or stop the world continuing to warm. For warming to stop, global CO2 emissions need to not only peak, but rapidly fall to net-zero.
Land-use emissions
The Global Carbon Budget estimates that land-use emissions will be 4.1GtCO2 in 2023, down around 5% from 2022 and continuing a small downward trend over the past two decades. However, despite declines in land-use emissions from deforestation, they remain substantially higher than CO2 removals from intentional reforestation and afforestation projects.
The Global Carbon Project now provides a database of land-use emissions by country, though it does not provide country-level emissions through to 2023 yet. The figure below highlights the four countries with the largest land-use emissions in 2022 – Brazil (grey shading), Indonesia (red), the Democratic Republic of Congo (bright blue) and China (yellow) – as well as land-use emissions in the rest of the world (purple).
Annual CO2 emissions from land-use change by major emitting countries and the rest of world from 1959-2022. Note that country-level land-use change emissions are not yet available for 2023. Data from the Global Carbon Project; chart by Carbon Brief.
The decline in global land-use emissions over the past two decades was driven in part by decreasing rates of deforestation in countries such as Brazil, as well as slightly increasing removals of CO2 from reforestation and afforestation projects.
However, these estimates are subject to large uncertainties – as recently as 2020 researchers thought land-use emissions had been increasing – and the Global Carbon Budget authors suggest that long-term trends should be interpreted with caution.
This year’s budget provides a first estimate of how land-use emissions break down into different categories. They find that permanent deforestation is responsible for emissions of around 4.2GtCO2 per year, with around 1.9GtCO2 removed per year by reforestation and afforestation.
(In addition, there is currently a tiny 0.00001GtCO2 removed by permanent carbon removal technologies, such as direct air capture and enhanced rock weathering.)
Deforestation due to shifting cultivation cycles (where deforestation is temporary before land is abandoned to return to forest cover) is responsible for emissions of around 2.9GtCO2 per year, while regrowth in previously cultivated areas removes around 2.8GtCO2 per year. This results in only a small net source of emissions (~0.1GtCO2 per year).
The harvesting of trees for wood (as well as other forest management) leads to net emissions of around 0.8GtCO2 per year, as deforestation for timber production is higher than regrowth rates globally – though this will vary substantially by country and region.
Finally, other emissions from land management, such as peat drainage and burning as well as other land transitions, are responsible for around 1.4GtCO2 per year.
Emissions from wildfires are also presented in the new report, which notes that it is not an additional CO2 source – rather, forest fires are part of the net land carbon sink (or included as land-use emissions if triggered by humans for deforestation purposes).
Chinese emissions drive rising global fossil CO2
Global emissions of fossil CO2 – including coal, oil, gas and cement – increased by around 1.1% in 2023, relative to 2022, with an uncertainty range of 0.0% to 2.1%. This represents a new record high and is 1.4% above the 2019 pre-Covid levels.
The figure below shows global CO2 emissions from fossil fuels, divided into emissions from China (red shading), India (yellow), the US (bright blue), EU (dark blue) and the remainder of the world (grey).
Annual fossil CO2 emissions by major countries and the rest of the world from 1959-2023, excluding the cement carbonation sink as national-level values are not available. Data from the Global Carbon Project; chart by Carbon Brief.
China represents 31% of global CO2 emissions. Their emissions in 2023 are projected to increase by 4% (with an uncertainty range of 1.9% to 6.1%), driven by a rise in emissions from coal (+3.3%), oil (+9.9%) and natural gas (+6.5%). The strong growth in Chinese emissions in 2023 is partly due to a delayed rebound from Covid-19 lockdowns.
India represents 8% of global emissions. In 2023, Indian emissions are projected to increase by 8.2% (ranging from 6.7% to 9.7%), with a 9.5% increase in emissions from coal, a 5.3% increase in emissions from oil, a 5.6% increase in emissions from natural gas and a 8.8% increase in emissions from cement.
The large growth in coal in India is being driven by rapid increases in electricity demand. While India is installing large amounts of renewable energy, it is still far from sufficient to meet the growth in demand. Emissions from India now exceed those from the European Union, though they remain much smaller on a per-capita basis.
The US represents 14% of global emissions (though is responsible for a much larger portion of historical emissions and associated atmospheric accumulation of CO2). US emissions are projected to decrease by 3% in 2023 (ranging from -5.0% to -1.0%). This is being driven by a large decrease in coal emissions, which are expected to fall by more than 18% compared with 2022 levels. Oil emissions are expected to decline by a slight 0.3%, reflecting the rise of electric vehicles, while emissions from gas are expected to increase by 1.4%.
The European Union represents 7% of global emissions. EU emissions are expected to decrease by a sizable 7.4% in 2023, driven by a 18.8% decline in coal emissions, a 1.5% decline in oil emissions and a 6.6% decline in natural gas emissions (driven in part by higher prices and the phaseout of Russian gas).
A combination of rapidly increasing renewable capacity, electric vehicle adoption, lower energy demand and generally high fossil energy prices are driving fairly rapid emissions reductions.
The rest of the world represents 40% of global emissions, of which 2.8% is international aviation and shipping. Emissions in the rest of the world are expected to grow by 0.4% in 2023 – though this is entirely due to growth in international aviation and shipping, which are expected to grow by 11.9% (reflecting a 28% increase in aviation emissions and a 1% increase in shipping emissions). The large increase in aviation emissions reflects the ongoing recovery from pandemic-era declines.
Excluding international aviation and shipping, emissions in the rest of the world are expected to fall by 0.4%.
The total emissions for each year between 2019 and 2023, as well as the countries and regions that were responsible for the changes in absolute emissions, are shown in the figure below. Annual emissions for 2019, 2020, 2021, 2022 and estimates for 2023 are shown by the black bars. The coloured bars show the change in emissions between each set of years, broken down by country or region – the US (bright blue), European Union (dark blue), China (red), India (yellow) and the rest of the world (grey). Negative values show reductions in emissions, while positive values reflect emission increases.
Annual global CO2 emissions from fossil fuels (black bars) and drivers of changes between years by country (coloured bars), excluding the cement carbonation sink as national-level values are not available. Negative values indicate reductions in emissions. Note that the y-axis does not start at zero. Data from the Global Carbon Project; chart by Carbon Brief.
In the absence of an increase in Chinese emissions, global CO2 emissions would have remained flat between 2022 and 2023, with declines in the US, the EU and the rest of the world counterbalancing increases in India and in shipping and aviation.
The large (0.5GtCO2) increase in Chinese emissions relative to 2022 resulted in an overall year-over-year increase in global fossil CO2.
However, there is reason to think that the large increase in Chinese emissions in 2023 will not persist, given that it in part reflected economic recovery after extended Covid lockdowns. As a recent Carbon Brief guest post argued, the combination of slowing economic growth and rapidly expanding clean energy deployments suggests that Chinese emissions might fall in 2024, though it is too early to know with confidence.
The Global Carbon Project also notes that emissions have declined over the past decade (2013-22) in 26 nations despite continued domestic economic growth, representing a long-term decoupling of CO2 emissions and the economy.
These countries include Belgium, Brazil, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hong Kong, Israel, Italy, Jamaica, Japan, Luxembourg, Netherlands, Norway, Portugal, Romania, Slovenia, South Africa, Sweden, Switzerland, UK, US and Zimbabwe. Collectively they represent 28% of global emissions.
Coal emissions reach record highs
Global fossil fuel emissions primarily result from the combustion of coal, oil and natural gas. Coal is responsible for more emissions than any other fossil fuel, representing approximately 41% of global fossil CO2 emissions in 2023. Oil is the second largest contributor at 32% of fossil CO2, while gas rounds out the pack at 21%.
These percentages reflect both the amount of each fossil fuel consumed globally, but also differences in CO2 intensities. Coal results in the most CO2 emitted per unit of heat or energy produced, followed by oil and natural gas.
The figure below shows global CO2 emissions from different fuels over time, covering coal (grey shading), oil (red) and gas (blue), as well as cement production (yellow) and other sources (purple). While coal emissions increased rapidly in the mid-2000s, it has largely plateaued since 2013. However, coal use increased significantly in 2021 and modestly in 2022 and 2023.
Annual CO2 emissions by fossil fuel from 1959-2023, excluding the cement carbonation sink. Data from the Global Carbon Project; chart by Carbon Brief.
Global emissions from coal increased by 1.1% in 2023 compared to 2023, while oil emissions increased 1.5% and gas emissions increased by 0.47%. Emissions from cement and other sources increased by 0.64%.
Despite setting a new record this year, global coal use is only 4% above 2011 levels – a full 12 years ago. By contrast, during the 2000s, global coal use grew at a rate of around 4% every single year.
The total emissions for each year between 2019 and 2023 (black bars), as well as the absolute change in emissions for each fuel between years, are shown in the figure below.
Annual global CO2 emissions from fossil fuels (black bars) and drivers of changes between years by fuel (coloured bars), excluding the cement carbonation sink. Negative values indicate reductions in emissions. Note that the y-axis does not start at zero. Data from the Global Carbon Project; chart by Carbon Brief.
Even though they have been increasing over the past three years, global CO2 emissions from oil remain below pre-pandemic highs of 2019.
Similarly, emissions from natural gas decreased notably in 2022 and were flat in 2023, reflecting the effect of higher prices due to geopolitical instability associated with the conflict in Ukraine.
The global carbon budget
Every year, the Global Carbon Project provides an estimate of the overall “global carbon budget”. This is based on estimates of the release of CO2 through human activity and its uptake by the oceans and land, with the remainder adding to atmospheric concentrations of the gas.
(This differs from the commonly used term “carbon budget”, referring to the amount of CO2 that can be released while keeping warming below global limits of 1.5 or 2C.)
The most recent budget, including estimated values for 2023, is shown in the figure below. Values above zero represent sources of CO2 – from fossil fuels and industry (grey shading) and land use (yellow) – while values below zero represent “carbon sinks” that remove CO2 from the atmosphere. Any CO2 emissions that are not absorbed by the oceans (dark blue) or land vegetation (green) accumulate in the atmosphere (blue).
Annual global carbon budget of sources and sinks from 1959-2023. Fossil CO2 emissions include the cement carbonation sink. Note that the budget does not fully balance every year due to remaining uncertainties, particularly in sinks. Data from the Global Carbon Project; chart by Carbon Brief.
The ocean takes up around 26% of total human emissions, or around 10.4GtCO2 per year. The ocean CO2 sink has been relatively flat from 2019 to 2022 due to persistent La Niña conditions (which tend to result in lower ocean CO2 uptake), but increased in 2023 in response to the emerging El Niño event.
The land sink takes up around 31% of global emissions, or 12.3GtCO2 per year on average. However, the land sink is expected to be notably lower in 2023 – only 10.4GtCO2 – due to the effect of El Niño on global vegetation.
Global CO2 emissions from fires were above average this year – at 7-8GtCO2 over the first 10 months of the year – largely due to the extreme wildfire season in Canada.
While fire emissions are presented alongside the global carbon budget for the first time in the 2023 report, a direct comparison cannot be made between fire emissions and other carbon budget components as they already show up in both parts of the land sink and land use emissions.
Overall, the impact of the ongoing emissions from human activity is that atmospheric CO2 continues to increase.
The growth rate of atmospheric CO2 in 2023 is expected to be around 2.4ppm, which matches the average rate over the past decade (2013-22). The emerging El Niño event is expected to contribute to a somewhat higher growth of atmospheric CO2 in 2024.
Atmosphere accumulation hits new heights
More than 40% of human emissions since the industrial revolution have accumulated in the atmosphere, with the remainder absorbed by land and ocean sinks.
The upper chart in the figure below shows the cumulative human emissions (dark blue line) and atmospheric CO2 accumulation (red) since 1750. The lower chart shows the percentage of cumulative emissions remaining in the atmosphere.
Cumulative CO2 emissions from fossil fuels (with the carbonation sink removed) and land use as well as atmospheric CO2 accumulation between 1750 and 2023 (top). Percentage of cumulative CO2 emissions remaining in the atmosphere over time (bottom). Data from the Global Carbon Project; chart by Carbon Brief.
The fact that global emissions substantially exceed atmospheric accumulation is a clear sign that the increase in atmospheric CO2 is due to human emissions, and that other natural systems including the ocean and biosphere are net sinks rather than sources.
This is reinforced by direct measurements showing that both are absorbing more carbon from the atmosphere over time.
The fact that less than half of human-caused emissions remain in the atmosphere over time is, ultimately, a good thing; it means that the world has experienced much less severe climate change than if all emissions remained in the atmosphere.
However, as the world continues to warm, the oceans and potentially the land will become less able to absorb a portion of our emissions. This means that the portion of human emissions remaining in the atmosphere is expected to increase in future.
The post Analysis: Growth of Chinese fossil CO2 emissions drives new global record in 2023 appeared first on Carbon Brief.
Analysis: Growth of Chinese fossil CO2 emissions drives new global record in 2023
The annual World Economic Forum is underway in the Swiss ski resort of Davos, providing a snowy backdrop for leaders and CEOs to opine on international affairs, including close to 65 heads of state and government On Wednesday afternoon, US President Donald Trump is set to speak, with all eyes on whether he will further stoke a potential US-European trade war over his bid to grab Greenland.
Despite geopolitics grabbing the limelight, there are panels addressing issues including electric vehicles, energy security and climate policy. Keep up with top takeaways from those discussions and other climate news from Davos in our bulletin, which we’ll update throughout the day.
In energy transition’s “messy phase”, climate policy falters but clean tech marches on
Politicians may be struggling to free themselves from the clutches of fossil fuel interests, but that won’t slam the brakes on the march of clean tech and renewables worldwide, former US Vice-President and longtime climate advocate Al Gore said at Davos on Wednesday.
Moderating one of the first panels on day two in an almost empty room, he made a stab at answering the question posed by the World Economic Forum: “How do we avoid a climate recession?”
Gore said he sees “a climate policy recession, but not a recession in the energy transition”. That, he explained, is because policy is controlled by governments – “and too many governments are now, unfortunately, controlled by special interests”, namely the fossil fuel industry which is “significantly better at capturing politicians than at capturing emissions”.
The result has been “schizophrenic” policy on addressing climate change in some countries, including in the US, he said, with periods of slamming on the brakes and “going back to the dirty fossil fuels” to satisfy the industry.
In the real world, however, the advantages of renewable energy have become obvious, as have the consequences of the climate crisis, he added, listing a litany of recent impacts.
On the technology front, Gore pointed out that in 2025, of all new electricity generation installed worldwide, 93% was renewables, and “the only thing coming down faster in price than solar panels is utility-scale batteries, because the production is doubling every year”. “So we don’t have a recession in the movement toward this energy transition, in my opinion,” he added.
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Entrepreneur Zhang Lei, founder and CEO of Envision, which develops technology for clean energy systems and AI-powered energy digital platforms, said there may be some swings in climate policy but “the fundamental physics is actually improving”.
He pointed to an 80% drop in the price of energy storage in the last three years, which he said opens up a lot of opportunities to increase the penetration of wind and solar. That, he added, is exactly what is needed to meet the upsurge in electricity demand driven by the advent of artificial intelligence (AI), describing renewables as “infinite and inexpensive energy resources”.
Fossil fuels, by contrast, are “finite” and therefore not up to the job of powering an AI-based future, with electricity supply expected to increase by 10 times in the next 15 years. Renewables, however, are competitive and approaching “zero marginal cost”, he noted.
“We are so lucky to have renewable energy ready” to take advantage of “great prosperity” driven by AI, Zhang Lei added, noting China’s pivotal role in providing the necessary clean tech to much of the world.
Investment by China is making the renewable energy transition “irreversible”, argued Elizabeth Thurbon, professor of international political economy and director of the Green Energy Statecraft Project at the University of New South Wales.
China will stay on this path, she added, because the government understands that the energy transition “is a massive national security multiplier” by boosting economic security, energy security, environmental security, social security through jobs and geo-strategic security.
Globally, however, she warned that the transition is “in a really messy, messy phase”, due largely to poor governance, especially across a lot of Western countries.
Carsten Schneider, Germany’s environment minister, argued that the European Union, for one, has not taken its foot off the climate policy pedal, agreeing a new emissions reduction goal of 90% by 2040 last December. But that was a hard-fought win, amid pressure from some coal-reliant Eastern European countries to soften the target.
EU’s new climate target lines up multibillion-dollar boost for carbon markets
On Tuesday afternoon, in a separate panel, Andrew Forrest, executive chairman and founder of Australian mining company Fortescue, advised politicians and business people not to waver in their commitment to the energy transition – from an economic perspective, if nothing else.
He spoke of his company’s plan to save up to a billion dollars per year in operating costs by removing over a billion litres of diesel from its supply chains by 2030, replacing the dirty fuel used by trucks, trains and ships with renewable energy and batteries. This will improve Fortescue’s efficiency and competitiveness, and cut pollution, Forrest added, enabling it to outperform its peers.
He appealed to fellow business and political leaders to follow economic sense, urging them not to turn away from renewables in 2026 “because the winds of politics blew your values over”.
The post Climate at Davos: Clean tech powers on despite policy wobbles appeared first on Climate Home News.
Climate at Davos: Clean tech powers on despite policy wobbles
Choosing the “least expensive” healthy food options could cut dietary emissions by one-third, according to a new study.
In addition to the lower emissions, diets composed of low-cost, healthy foods would cost roughly one-third as much as a diet of the most-consumed foods in every country.
The study, published in Nature Food, compares prices and emissions associated with 440 local food products in 171 countries.
The researchers identify some food groups that are low in both cost and emissions, including legumes, nuts and seeds, as well as oils and fats.
Some of the most widely consumed foods – such as wheat, maize, white beans, apples, onions, carrots and small fish – also fall into this category, the study says.
One of the lead authors tells Carbon Brief that while food marketing has promoted the idea that eating environmentally friendly diets is “very fancy and expensive”, the study shows that such diets are achievable through cheap, everyday foods.
Meanwhile, a separate Nature Food study found that reforming the policies that reduce taxes on meat products in the EU could decrease food-related emissions by up to 5.7%.
Costs and emissions
The study defines a healthy diet using the “healthy diet basket” (HDB), which is a standard based on nutritional guidelines that includes a range of food groups with the needed nutrients to provide long-term health.
Using both data on locally available products and food-specific emissions databases, the authors estimate the costs and greenhouse gas emissions of 440 food products needed for healthy diets in 171 countries.
They examine three different healthy diets: one using the most-consumed food products, one using the least expensive food products and one using the lowest-emitting food products.
Each of these diets is constructed for each country, based on costs, emissions, availability and consumption patterns.
The researchers find that a healthy diet comprising the most-consumed foods within each country – such as beef, chicken, pork, milk, rice and tomatoes – emits an average of 2.44 kilograms of CO2-equivalent (kgCO2e) and costs $9.96 (£7.24) in 2021 prices, per person and per day.
However, they find that a healthy diet with the least-expensive locally available foods in each country – such as bananas, carrots, small fish, eggs, lentils, chicken and cassava – emits 1.65kgCO2e and costs $3.68 (£2.68). That is approximately one-third of the emissions and one-third of the cost of the most-consumed products diet.
In comparison, a healthy diet with the lowest-emissions products – such as oats, tuna, sardines and apples – would emit just 0.67kgCO2e, but would cost nearly double the least-expensive diet, at $6.95 (£5.05).
This reveals the tradeoffs of affordability and sustainability – and shows that the least-expensive foods tend to produce lower emissions, according to the study.
Dr Elena Martínez, a food-systems researcher at Tufts University and one of the lead authors of the study, tells Carbon Brief this is generally true because lower-cost food production tends to use fewer fossil fuels and require less land-use change, which also cuts emissions.
Ignacio Drake is coordinator of the fiscal and economic policies at Colansa, an organisation promoting healthy eating and sustainable food systems in Latin America and the Caribbean.
Drake, who was not involved in the study, tells Carbon Brief that the research is a “step further” than previous work on healthy diets. He adds that the study “integrates and consolidates” previous analyses done by other groups, such as the World Bank and the UN Food and Agriculture Organization.
Food group differences
The research looks at six food groups: animal-sourced foods, oils and fats, fruits, legumes (as well as nuts and seeds), vegetables and starchy staples.
Animal-sourced foods – such as meat and dairy – are typically the most-emitting, and most-expensive, food group.
Within this group, the study finds that beef has the highest costs and emissions, while small fish, such as sardines, have the lowest emissions. Milk and poultry are amongst the least-expensive products for a healthy diet.
Starchy staple products also contribute to high emissions too, adds the study, because they make up such a large portion of most people’s calories.
Emissions from fruits, vegetables, legumes and oil are lower than those from animal-derived foods.
The following chart shows the energy contributions (top) and related emissions (bottom) from six major food groups in the three diets modelled by the study: lowest-cost (left), lowest-emission (middle) and most-common (right) food items.
The six food groups examined in the study are shown in different colours: animal-sourced foods (red), legumes, nuts and seeds (blue), oils and fats (purple), vegetables (green), fruits (orange) and starchy staples (yellow). The size of each box represents the contribution of that food to the overall dietary energy (top) and greenhouse gas emissions (bottom) of each diet.
Prof William Masters, a professor at Tufts University and author on the study, tells Carbon Brief that balancing food groups is important for human health and the environment, but local context is also important. For example, he points out that in low-income countries, some people do not get enough animal-sourced foods.
For Drake, if there are foods with the same nutritional quality, but that are cheaper and produce fewer emissions, it is logical to think that the “cost-benefit ratio [of switching] is clear”.
Other studies and reports have also modelled healthy and sustainable diets and, although they do not exclude animal-sourced foods, they do limit their consumption.
A recent study estimated that a global food system transformation – including a diet known as the “planetary health diet”, based on cutting meat, dairy and sugar and increasing plant-based foods, along with other actions – can help limit global temperature rise to 1.85C by 2050.
The latest EAT-Lancet Commission report found that a global shift to healthier diets could cut non-CO2 emissions from agriculture, such as methane and nitrous oxide, by 15%. The report recommends increasing the production of fruit, vegetable and nuts by two-thirds, while reducing livestock meat production by one-third.
Dr Sonia Rodríguez, head of the department of food, culture and environment at Mexico’s National Institute of Public Health, says that unlike earlier studies, which project ideal scenarios, this new study also evaluates real scenarios and provides a “global view” of the costs and emissions of diets in various countries.
Increasing access
The study points out that as people’s incomes increase, their consumption of expensive foods also increases. However, it adds, some people with high income that can afford healthy diets often consume other types of foods, due to reasons such as preferences, time and cooking costs.
The study stresses that nearly one-third of the world’s population – about 2.6 billion people – cannot afford sufficient food products required for a healthy diet.
In low-income countries, primarily in sub-Saharan Africa and south Asia, 75% of the population cannot afford a healthy diet, says the study.
In middle-income countries, such as China, Brazil, Mexico and Russia, more than half of the population can afford such a diet.
To improve the consumption of healthy, sustainable and affordable foods, the authors recommend changes in food policy, increasing the availability of food at the local level and substituting highly emitting products.
Martínez also suggests implementing labelling systems with information on the environmental footprint and nutritional quality of foods. She adds:
“We need strategies beyond just reducing the cost of diets to get people to eat climate-friendly foods.”
Drake notes that there are public and financial policies that can help reduce the consumption of unhealthy and unsustainable foods, such as taxes on unhealthy foods and sugary drinks. This, he adds, would lead to better health outcomes for countries and free up public resources for implementing other policies, such as subsidies for producing healthy food.
Separately, another recent Nature Food study looks at taxes specifically on meat products, which are subject to reduced value-added tax (VAT) in 22 EU member states.
It finds that taxing meat at the standard VAT rate could decrease dietary-related greenhouse gases by 3.5-5.7%. Such a levy would also have positive outcomes for water and land use, as well as biodiversity loss, according to the study.
The post Adopting low-cost ‘healthy’ diets could cut food emissions by one-third appeared first on Carbon Brief.
Adopting low-cost ‘healthy’ diets could cut food emissions by one-third
As a treaty to protect the High Seas entered into force this month with backing from more than 80 countries, major fishing nations China, Japan and Brazil secured a last-minute seat at the table to negotiate the procedural rules, funding and other key issues ahead of the treaty’s first COP.
The Biodiversity Beyond National Jurisdiction (BBNJ) pact – known as the High Seas Treaty – was agreed in 2023. It is seen as key to achieving a global goal to protect at least 30% of the planet’s ecosystems by 2030, as it lays the legal foundation for creating international marine protected areas (MPAs) in the deep ocean. The high seas encompass two-thirds of the world’s ocean.
Last September, the treaty reached the key threshold of 60 national ratifications needed for it to enter into force – a number that has kept growing and currently stands at 83. In total, 145 countries have signed the pact, which indicates their intention to ratify it. The treaty formally took effect on January 17.
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“In a world of accelerating crises – climate change, biodiversity loss and pollution – the agreement fills a critical governance gap to secure a resilient and productive ocean for all,” UN Secretary-General António Guterres said in a statement.
Julio Cordano, Chile’s director of environment, climate change and oceans, said the treaty is “one of the most important victories of our time”. He added that the Nazca and Salas y Gómez ridge – off the coast of South America in the Pacific – could be one of the first intact biodiversity hotspots to gain protection.
Scientists have warned the ocean is losing its capacity to act as a carbon sink, as emissions and global temperatures rise. Currently, the ocean traps around 90% of the excess planetary heat building up from global warming. Marine protected areas could become a tool to restore “blue carbon sinks”, by boosting carbon absorption in the seafloor and protecting carbon-trapping organisms such as microalgae.
Last-minute ratifications
Countries that have ratified the BBNJ will now be bound by some of its rules, including a key provision requiring countries to carry out environmental impact assessments (EIA) for activities that could have an impact on the deep ocean’s biodiversity, such as fisheries.
Activities that affect the ocean floor, such as deep-sea mining, will still fall under the jurisdiction of the International Seabed Authority (ISA).
Nations are still negotiating the rules of the BBNJ’s other provisions, including creating new MPAs and sharing genetic resources from biodiversity in the deep ocean. They will meet in one last negotiating session in late March, ahead of the treaty’s first COP (conference of the parties) set to take place in late 2026 or early 2027.
China and Japan – which are major fishing nations that operate in deep waters – ratified the BBNJ in December 2025, just as the treaty was about to enter into force. Other top fishing nations on the high seas like South Korea and Spain had already ratified the BBNJ last year.
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Tom Pickerell, ocean programme director at the World Resources Institute (WRI), said that while the last-minute ratifications from China, Japan and Brazil were not required for the treaty’s entry into force, they were about high-seas players ensuring they have a “seat at the table”.
“As major fishing nations and geopolitical powers, these countries recognise that upcoming BBNJ COP negotiations will shape rules affecting critical commercial sectors – from shipping and fisheries to biotechnology – and influence how governments engage with the treaty going forward,” Pickerell told Climate Home News.
Some major Western countries – including the US, Canada, Germany and the UK – have yet to ratify the treaty and unless they do, they will be left out of drafting its procedural rules. A group of 18 environmental groups urged the UK government to ratify it quickly, saying it would be a “failure of leadership” to miss the BBNJ’s first COP.
Finalising the rules
Countries will meet from March 23 to April 2 for the treaty’s last “preparatory commission” (PrepCom) session in New York, which is set to draft a proposal for the treaty’s procedural rules, among them on funding processes and where the secretariat will be hosted – with current offers coming from China in the city of Xiamen, Chile’s Valparaiso and Brussels in Belgium.
Janine Felson, a diplomat from Belize and co-chair of the “PrepCom”, told journalists in an online briefing “we’re now at a critical stage” because, with the treaty having entered into force, the preparatory commission is “pretty much a definitive moment for the agreement”.
Felson said countries will meet to “tidy up those rules that are necessary for the conference of the parties to convene” and for states to begin implementation. The first COP will adopt the rules of engagement.
She noted there are “some contentious issues” on whether the BBNJ should follow the structure of other international treaties such as the Convention on Biological Diversity (CBD), as well as differing opinions on how prescriptive its procedures should be.
“While there is this tension on how far can we be held to precedent, there is also recognition that this BBNJ agreement has quite a bit to contribute in enhancing global ocean governance,” she added.
The post Big fishing nations secure last-minute seat to write rules on deep sea conservation appeared first on Climate Home News.
Big fishing nations secure last-minute seat to write rules on deep sea conservation
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