The Planet Is Absorbing Heat Twice as Fast as It Did Two Decades Ago

TL;DR

Earth's energy imbalance — the gap between incoming solar energy and heat radiated back to space — hit a record 1.12 watts per square metre (2013–2025 average), more than double the level of two decades ago.
Human-induced warming reached 1.37°C above pre-industrial levels in 2025. The planet is now warming at 0.27°C per decade — the fastest rate on record.
The 1.5°C Paris threshold is now expected to be crossed around 2030.
Global sea levels are rising at 3.67 mm/year — more than double the rate of 1976–1995.
The report, published in Earth System Science Data, was produced by dozens of scientists using more than 40 global datasets. Its findings are designed to fill the gap between IPCC reports, which arrive every 5–7 years.

What Happened

On 22 June 2026, the fourth annual "Indicators of Global Climate Change" (IGCC) report was published in the journal Earth System Science Data. Produced by an international team led by Prof Piers Forster at the University of Leeds, the IGCC tracks the key metrics of the climate system on an annual basis — faster than the IPCC's 5-to-7-year cycle.

The headline finding is stark: Earth's energy imbalance — the net amount of extra heat trapped in the climate system by human activity — has reached a record high. Over the most recent period analysed (2013–2025), the imbalance averaged 1.12 watts per square metre (W/m²). That is a roughly 40% increase since the 2019 IPCC assessment, which reported 0.79 W/m² for 2006–2018.

To put 1.12 W/m² in perspective: it is the equivalent of every square metre of the planet's surface continuously absorbing the energy of a small LED lightbulb, 24 hours a day, 365 days a year — and that number is growing.

The report also found that:

Greenhouse gas emissions reached 56.8 billion tonnes of CO₂-equivalent in 2024, an all-time high.
Atmospheric CO₂ hit 425.6 parts per million in 2025 — up 3.8% since 2019.
Human-induced warming reached 1.37°C above pre-industrial levels.
Marine heatwave days more than tripled globally since the early 1990s. In 2025 alone, the ocean experienced 65 marine heatwave days — more than one per week.
Sea level rise is accelerating: 3.67 mm/year over 2006–2025, compared to 1.69 mm/year over 1976–1995.

The report draws on more than 40 global datasets, including NASA's CERES satellite record and the ARGO deep-ocean float network.

What It Actually Means

The energy imbalance is the closest thing climate science has to a single honest number. It does not depend on weather, or El Niño, or any single year's temperature record. It is the direct physical measure of how much extra energy the Earth system is holding onto. And it is now running ahead of model projections.

This matters for three reasons.

First, the acceleration is real and measurable. The imbalance has more than doubled in two decades. The rate of warming — 0.27°C per decade — is the fastest in the instrumental record. These are not projections. They are observations.

Second, the models are being outpaced. The report notes that recent increases in the energy imbalance have exceeded those projected by climate models. This suggests the planet could see more warming than expected — and sooner. Part of the explanation is the decline in sulphate aerosol emissions (which have a cooling effect), but the full picture is still being worked out.

Third, the 1.5°C threshold is now imminent. The report estimates that the Paris Agreement's 1.5°C limit will be crossed around 2030. That is not a distant horizon. It is four years away. And 1.5°C is not an arbitrary number: it is the line beyond which the IPCC has identified risks of catastrophic, potentially irreversible damage to ecosystems and human societies.

The ocean tells the same story. Ninety percent of the excess heat goes into the sea. Marine heatwave days have more than tripled. Sea level rise has more than doubled its rate. These are not separate problems — they are the same problem, measured in different media.

Hype Deconstruction

This is not a "we're all doomed" story, and it is not a "nothing to see here" story. It is a measurement story — and the measurement is worse than expected.

What the report does not say: that the climate system has passed an irreversible tipping point, that warming is accelerating exponentially, or that emissions cuts are futile. The IGCC authors are careful to note that "a significant increase in decarbonisation efforts in the second half of this decade is required to slow down the rate of human-caused warming." The door is not closed. But it is closing faster than anyone thought.

What the report does say: the physical evidence is now unambiguous, the trend is accelerating, and the window for staying under 1.5°C is measured in years, not decades.

Stakeholder Landscape

Who is directly affected: Coastal communities everywhere. The 3.67 mm/year sea level rise rate compounds — and it is accelerating. Low-lying nations (Bangladesh, Pacific island states, the Netherlands, parts of the US Gulf and East Coasts) face the most immediate physical risk.

Who is second-order affected: Agriculture, insurance, and infrastructure. Marine heatwaves are already disrupting fisheries. Extreme heat over land — average maximum daily temperatures now 1.92°C above pre-industrial levels — is stressing crop yields and energy grids.

Who benefits from the noise: No one, in any honest sense. But the report's findings will be weaponised by both sides of the climate debate — one to argue that action is futile, the other to argue that only radical measures remain. Both framings are distortions of what the data actually says.

Who is affected but rarely discussed: The scientists who produce these datasets. The report explicitly warns that long-term monitoring programmes — weather balloon networks, satellite missions, ocean float arrays — are threatened by funding cuts, most notably from the current US administration. Without these observations, future assessments become harder at precisely the moment they are most needed.

Cross-Layer Implications

The aerosol paradox. One of the most uncomfortable findings in the report is that cleaning up air pollution — specifically sulphate aerosols from shipping and industry — is increasing the energy imbalance. Aerosols have a cooling effect. As they decline, more warming is unmasked. This is not an argument against cleaning the air (the health benefits are overwhelming), but it means the climate system responds faster to emissions cuts than simple CO₂ accounting would suggest.

The data infrastructure crisis. The IGCC report used more than 40 global datasets. Several of the observing systems that feed those datasets — particularly weather balloon networks in Africa, the West Pacific, and South America — are in decline. The report cites media accounts of reduced weather balloon launches in Alaska leading to missed storm warnings. Climate monitoring is not a luxury; it is infrastructure, and it is degrading.

The El Niño wildcard. A new El Niño was declared in June 2026. The IGCC data covers through 2025, so the next report will capture its effects. If the 2026–2027 El Niño is strong — and the US Climate Prediction Center puts the odds of a "Super El Niño" at 63% — the energy imbalance numbers could jump again.

What This Means for You

The honest answer is that no individual action changes the trajectory of a 1.12 W/m² global energy imbalance. But there are things a reader can do that are more useful than despair:

If you live near the coast: Sea level rise is accelerating. The 3.67 mm/year rate is a long-term average; storm surge and king tide events are where the damage happens. Check your local council's coastal hazard maps. If you are buying property, factor in a 30-year horizon, not a 5-year one.

If you work in agriculture, insurance, or infrastructure: The 1.92°C land temperature anomaly over 2016–2025 is your new baseline. Stress-test your models against a 2030 world at 1.5°C+, not a 2000 world.

If you are a citizen in a democracy: The report's warning about degrading observation networks is actionable. Weather balloon programmes, satellite missions, and ocean monitoring are funded by governments. They are cheap relative to the cost of flying blind.

If you are simply a human being reading this: The number to carry with you is not 1.5°C or 1.12 W/m². It is this: the Earth's energy imbalance has doubled in twenty years, and it is still rising. That is the trend. Everything else is commentary.

Uncertainty Ledger

The aerosol effect. How much of the recent acceleration is due to declining sulphate aerosols versus rising greenhouse gases is not fully quantified. If the aerosol contribution is larger than estimated, future warming could be even faster.
The 1.5°C crossing date. The "around 2030" estimate has uncertainty bars. A strong El Niño could bring it forward; a sustained La Niña could push it back. But the direction is not in doubt.
Observation network continuity. The report flags but cannot quantify the risk that funding cuts to monitoring programmes will degrade future assessments.
Tipping points. The IGCC does not assess whether specific tipping points (ice sheet collapse, Amazon dieback, permafrost carbon release) have been crossed. Those are separate research questions.

Bottom Line

The Earth's energy imbalance — the most fundamental measure of how thoroughly human activity is disrupting the climate — has doubled in twenty years and is now running at a record 1.12 watts per square metre. The planet is warming at 0.27°C per decade, the fastest rate ever recorded. Sea levels are rising more than twice as fast as they were a generation ago. The 1.5°C threshold is now expected around 2030. None of this is a model projection. It is what the instruments are reading, right now. The data infrastructure that makes these measurements possible is itself under threat — and without it, we lose the ability to know how fast the ground is shifting beneath us.

Sources:

Forster, P. M. et al. (2026) "Indicators of global climate change 2025: annual update of key indicators of the state of the climate system and human influence," Earth System Science Data, doi:10.5194/essd-18-3889-2026. [Tier 1 — peer-reviewed journal]
Carbon Brief / CleanTechnica guest post by Prof Piers Forster, Dr Debbie Rosen, Dr Matt Palmer, Dr Karina Von Schuckmann (22 June 2026). [Tier 2 — expert-authored synthesis of Tier 1 research]
NASA CERES satellite record. [Tier 1 — primary observational data]
IPCC Sixth Assessment Report (AR6). [Tier 1 — intergovernmental scientific assessment]
US Climate Prediction Center El Niño forecast (June 2026). [Tier 1 — government agency]