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Global Climate Change Indicators Report shows that human-induced global warming reached 1.37°C in 2025. With a rate of 0.27°C per decade, a remaining budget of 130 billion tons of CO₂, and seas under pressure, the 1.5°C limit could be reached in about four years.
Global warming has entered an acceleration phase that quickly reduces the planet’s climate safety margin. The fourth edition of the Global Climate Change Indicators report, released in 2026, indicates that human influence raised warming to 1.37°C in 2025.
The analysis gathers indicators on emissions, greenhouse gas concentration, temperature, Earth’s energy balance, carbon budget, marine heatwaves, and sea level. The most sensitive data is the projection that the 1.5°C limit could be exceeded in about four years if the current trend continues.
The planet is accumulating heat at an unprecedented rate
The report shows that Earth’s climate system continues to retain heat at a high speed. This accumulation appears in the so-called energy imbalance of the planet, an indicator that measures the difference between the energy that enters, mainly from solar radiation, and the energy that exits back into space.
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When this balance is positive, the planet warms. According to the report, this imbalance has been growing since the 1970s and has reached a record level. In practice, this means that Earth is storing more energy than it can return, reinforcing changes in the atmosphere, oceans, glaciers, and climate patterns.
Global warming does not only appear as an increase in air temperature but as an accumulation of energy throughout the climate system. That is why the effects also spread through the seas, ocean levels, heatwaves, and the intensity of extremes.
The rate of warming induced by human activities was estimated at about 0.27°C per decade. This pace is central to the projection about the 1.5°C limit because small annual variations may seem discreet, but accumulated over decades, they rapidly alter the global climate level.
The 1.5°C limit is approaching faster
The 1.5°C limit has gained international importance due to its association with the Paris Agreement and efforts to contain more severe climate impacts. It does not represent a “magic line” where everything changes at once, but serves as a reference to measure risk, intensity of extreme events, and pressure on ecosystems.
According to the report update, human influence has already led to a warming of 1.37°C by 2025, compared to the pre-industrial period. If the observed pace continues, warming caused by human activities could reach 1.5°C around 2030, that is, in approximately four years.
The difference between 1.37°C and 1.5°C seems small but is decisive on a climatic scale. Fractions of a degree increase the likelihood of intense heatwaves, prolonged droughts, extreme rainfall, ice loss, and pressure on coastal regions.
It is also important to separate two things: a single year above 1.5°C does not necessarily mean that the long-term climate goal has been officially surpassed. What concerns scientists is the persistent trend, measured in long-term averages, indicating a rapid approach to this threshold.
Remaining carbon budget fell to 130 billion tons
Another central point of the report is the remaining carbon budget. This concept estimates how much carbon dioxide humanity could still emit before surpassing a certain temperature limit becomes inevitable, within the probabilities considered by climate science.
For the 1.5°C limit, the update indicates a central budget of about 130 billion tons of CO₂ from the beginning of 2026. This number is not an authorization to emit, but a scale alert: it shows that the remaining margin has become very narrow given the annual volume of global emissions.
The report also informs that global emissions of greenhouse gases reached 56.8 billion tons of CO₂ equivalent in 2024, the most recent data available in the analysis. Considering the current pace of CO₂ emissions, the 130 billion ton budget could be exhausted in just over three years.
The carbon budget works like a climate counter: the more emissions enter the atmosphere, the smaller the window to keep warming under control. This is why the debate on emission reduction has gained even greater urgency.
Greenhouse gases remain at record levels
The advancement of global warming is mainly linked to the increase in the concentration of greenhouse gases in the atmosphere. Among them are carbon dioxide, methane, and nitrous oxide, all associated with different human activities, such as burning fossil fuels, agriculture, industry, transportation, and land use.
The 2026 update indicates that the concentrations of these gases continued to rise. CO₂ reached 425.6 parts per million in 2025, while methane reached 1,936.3 parts per billion and nitrous oxide 339.4 parts per billion. These are technical indicators, but they help to understand why warming is not slowing down.
As concentrations increase, the planet maintains a trend of accumulated warming. Even if emissions started to fall, the climate system would still respond to the volume of gases already present in the atmosphere, especially in the case of CO₂, which remains for long periods.
The report also highlights a less intuitive factor: the reduction of sulfur aerosols may make part of the warming more evident. These aerosols had a partial cooling effect by reflecting part of the solar radiation. With their decline, part of the previously masked warming becomes more exposed.
Oceans and sea levels show signs of pressure
The oceans are an essential part of the climate system because they absorb much of the heat accumulated by the planet. Therefore, when the Earth retains more energy, the seas also respond, with increased temperature, changes in water chemistry, and impacts on marine ecosystems.
The latest edition of the report has started to prominently track the days of marine heatwaves. In 2025, 65 days were recorded under these conditions on a global scale. The number has more than tripled since 1991, indicating that episodes of extreme heat in the ocean have become more frequent.
Marine heatwaves do not only affect fish and corals; they also interfere with fishing, coastal infrastructure, tourism, oceanic carbon, and the safety of coastal communities. Heat in the sea can alter habitats, intensify stress on species, and modify ecological chains.
Sea levels are also continuing to rise. According to the report, the accumulated rise has reached 23 centimeters since 1901, with the current rate around 1.8 millimeters per year and a trend of acceleration. The increase is associated with the melting of land ice and the thermal expansion of warmer water.
The climate window depends on the decisions of this decade
The report data shows that the climate window is shrinking, but there is still a difference between temporarily exceeding 1.5°C and abandoning any attempt to limit damage. Climate science reinforces that each fraction of a degree avoided reduces risks to people, ecosystems, and infrastructure.
The most important point is that global warming responds to the accumulation of emissions. This means that decisions about energy, transportation, industry, land use, and food production directly influence the extent of future warming. The later emissions fall, the smaller the margin for maneuver.
The message of the report is not one of paralysis, but of measurable urgency. The numbers show how much heat has already been accumulated, how much carbon remains in the estimated budget, and which indicators are deteriorating faster.
Do you think governments, companies, and consumers still treat global warming as a distant problem, or do the data already show that the current decade will be decisive?
Leave your opinion in the comments and tell us which measures should be prioritized to reduce emissions without ignoring social and economic impacts.
