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In a stark and urgent report, the Global Carbon Budget 2025 paints a picture of a planet caught in a devastating contradiction: global fossil fuel emissions have surged to a new record high, even as the window to limit global warming to 1.5 ∘C slams shut.
New research from the Global Carbon Project confirms that global carbon emissions from fossil fuels are projected to rise by 1.1% in 2025, reaching an all-time peak. This single year's activity is expected to inject 38.1 billion tonnes of fossil carbon dioxide (CO 2) into the atmosphere. With this projected increase, the concentration of CO 2in the atmosphere is set to reach 425.7 ppm in 2025, marking a 52% increase above pre-industrial levels (around 278 ppm in 1750).
The Fading Carbon Budget: Four Years Left
The most alarming finding of the report is the immediate threat to the Paris Agreement's most ambitious target. The remaining carbon budget for limiting global warming to 1.5 ∘C is now considered "virtually exhausted".
Starting from the beginning of 2026, the remaining carbon budget for a 50% likelihood of keeping warming under 1.5 ∘C is a mere 50 GtC (or 170 GtCO 2).
At the projected emissions rate of 2025, this critical budget will be consumed in approximately four years.
The carbon budgets for limiting warming to 1.7 ∘C and 2 ∘C have also been severely diminished, reduced to enough for about 12 and 25 years respectively at current emission levels.
Growth in the World's Major Emitters
The overall global rise is fueled by projected increases in emissions from major economies, in some cases reversing recent positive trends.
The projected surge in global fossil fuel emissions for 2025 is driven by increases across all major fuel types, with gas, oil, and coal all expected to rise by 1.3%, 1.0%, and 0.8% respectively, compared to 2024 levels.
Nature's Fading Defense: The Sinks are Straining
While human emissions spike, the Earth's natural defense systems—the ocean and land carbon sinks—are showing signs of severe strain due to climate change.
The report finds that climate change and climate variability are weakening the combined land and ocean carbon sinks.
Since 1960, this weakening effect is responsible for 8% of the rise in atmospheric CO 2 concentration.
The ocean sink's ability to absorb carbon has been "stagnant" since 2016, a trend influenced by the recent ocean heatwave of 2023-2024 in the Northern Hemisphere.
However, the land sink—which absorbs CO 2 through natural ecosystems—is expected to show a significant recovery in 2025, returning to pre-El Niño levels. This recovery follows a strong reduction in 2024 due to the prolonged 2023-2024 El Niño weather pattern.
A Single Beacon of Hope
Despite the overall devastating trend, the research highlights that efforts to decarbonize are beginning to take root in some nations. The number of countries successfully reducing their emissions while simultaneously growing their economies nearly doubled in the last decade. During the period 2015-2024, a total of 35 countries saw their fossil CO 2emissions decrease even as their economies expanded.
However, this progress remains insufficient to counteract the overwhelming growth in global energy demand. To keep the 1.5 ∘C goal alive, the required cuts in emissions—an average reduction of 4% of 2025 total anthropogenic emissions each year until 2050—would need to be comparable to the dramatic, global drop observed during the height of the COVID-19 pandemic.
With the remaining carbon budget for 1.5 ∘C equivalent to less than four years of current emissions, the time for incremental change has ended. The new Global Carbon Budget makes it clear: the world must achieve an immediate, dramatic, and sustained decline in global emissions to avert the virtually exhausted climate crisis.
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The Final Countdown: Global CO 2
Emissions Hit a Record High as the 1.5 ∘C Carbon Budget is 'Virtually Exhausted'
In a stark and urgent report, the Global Carbon Budget 2025 paints a picture of a planet caught in a devastating contradiction: global fossil fuel emissions have surged to a new record high, even as the window to limit global warming to 1.5 ∘C slams shut.
An Alarming New Global Record
New research from the Global Carbon Project confirms that global carbon emissions from fossil fuels are projected to rise by 1.1% in 2025, reaching an all-time peak. This single year's activity is expected to inject an unprecedented 38.1 billion tonnes of fossil carbon dioxide (CO 2) into the atmosphere. With this projected increase, the concentration of CO 2 in the atmosphere is set to reach 425.7 ppm in 2025. This is a staggering 52% increase above the pre-industrial level of around 278 ppm in 1750.
The overall global rise is driven by increases across all major fuel types compared to 2024 levels: gas emissions are projected to rise by 1.3%, oil by 1.0%, and coal by 0.8%.
The 1.5 ∘C Carbon Budget Disappears
The most alarming finding of the report is the immediate threat to the Paris Agreement's most ambitious target. The remaining carbon budget for limiting global warming to 1.5 ∘C is now considered "virtually exhausted".
Starting from the beginning of 2026, the total remaining carbon budget that gives a 50% likelihood of staying under 1.5 ∘C is only 170 GtCO 2(or 50 GtC). At the projected total anthropogenic emissions rate of 2025, this critical budget will be consumed in approximately four years. The carbon budgets for limiting warming to 1.7 ∘C and 2 ∘C have also been severely diminished, reduced to enough for about 12 and 25 years respectively at current emission levels.
Major Economies Reverse Course
The projected surge in global fossil fuel emissions is fueled by increases in major economies, in some cases reversing positive trends from previous years.
Emissions in the United States are projected to increase by +1.9% in 2025, reversing a long-term downward trend.
The European Union (EU27) is also projected to see an increase of +0.4%, similarly reversing a previous decrease.
India's emissions are projected to increase by +1.4%.
China is expected to see a slight increase of +0.4%.
Only a few major economies are projected to show a decrease, such as Japan with a projected fall of −2.2%.
Earth's Natural Sinks are Straining
While human emissions climb, the planet's natural carbon sinks—the vast ocean and land ecosystems that absorb CO 2—are showing signs of severe strain.
The overall weakening of these combined land and ocean sinks due to climate change is responsible for an estimated 8% of the rise in atmospheric CO 2 concentration since 1960.
The ocean sink's ability to absorb carbon has been "stagnant" since 2016.
On land, the end of the 2023-2024 El Niño weather pattern—which typically causes heat and drought—is expected to allow the land sink to recover entirely in 2025, returning to pre-El Niño levels after a strong reduction in 2024.
A Narrow Path Forward
Despite the devastating global trend, the report highlights that successful decarbonization efforts are possible. The number of countries that managed to reduce their fossil CO 2 emissions while simultaneously growing their economies nearly doubled in the last decade (2015-2024), reaching a total of 35 countries.
However, this progress is being swiftly outpaced by the growth in global energy demand. To meet the Paris Agreement's goal of limiting warming to 1.7 ∘C (well below 2 ∘C) and reach net-zero by 2050, total anthropogenic CO 2 emissions must be cut by an average of 4% each year starting from 2025. This rate of decline is comparable in magnitude to the massive, globally coordinated reduction in emissions observed during the height of the COVID-19 pandemic in 2020. With the most ambitious 1.5 ∘C target now essentially lost, only an immediate, dramatic, and sustained global decline in emissions can preserve a pathway toward the higher-level climate goals.