WMO report finds Earth’s climate indicators further out of balance in 2025

Earth’s climate system retained energy at its fastest recorded rate in 2025, according to the World Meteorological Organization’s State of the Global Climate 2025 report. The assessment brings together measurements of temperature, ocean heat, ice, sea level and greenhouse gas concentrations. Taken together, those indicators describe a system accumulating heat rather than returning an equivalent amount to space.

The report, released on March 23, places Earth’s energy imbalance at its highest level since observational records began in 1960. That measure tracks the difference between energy entering the Earth system and energy leaving it. Reporting on the WMO findings describes the imbalance as a widening gap in the planet’s heat budget. The WMO’s inclusion of this metric among its key climate indicators gives added prominence to a measure that helps connect changes across the atmosphere, oceans and ice.

The report examines conditions at a global scale, where measurements from different parts of the Earth system form a single account. Climate observations cross national borders, placing the assessment among wider world developments shaped by shared environmental conditions and international monitoring.

A record energy imbalance puts ocean heat in focus

The energy imbalance has increased since 1960, with a particularly marked rise over the past two decades, according to the WMO findings. This does not mean that all parts of the climate system warm in the same way or at the same pace. It does mean that the total amount of heat held within the system has continued to grow.

The oceans are central to that picture. About 91 percent of the excess heat retained by the climate system is absorbed by the oceans. In 2025, ocean heat content down to 2,000 meters reached a record high, surpassing the previous record set in 2024. The scale of that measurement matters because it is not confined to surface conditions: it reflects heat stored through a substantial depth of the ocean.

Ocean heat is one of the indicators examined alongside ocean acidification, sea-level rise, Antarctic sea-ice extent and glacier melt. The WMO’s assessment does not present these measures as isolated developments. Its framework instead shows why a planetary energy budget is useful context: retained heat is distributed across the climate system, including the ocean, land, atmosphere and ice.

The report’s main indicators also show that the ocean continues to warm and absorb carbon dioxide. The WMO assessment records ocean heat content through a depth of 2,000 meters, providing a broader measure than conditions at the sea surface alone. For readers following international environmental developments, the significance is less about a single annual record than about the persistence of several measurements moving in the same direction over time.

2025 extended a long run of exceptionally warm years

Global temperature remained near the top of the historical record in 2025. The WMO found that the year was the second- or third-hottest on record, at approximately 1.43 degrees Celsius above the 1850-1900 average. Differences in the ranking reflect the datasets used for global temperature analysis, but the assessment is clear on the broader result: 2025 remained among the warmest years measured.

The longer sequence is equally notable. The years from 2015 through 2025 were the 11 hottest on record. This framing avoids treating a single year as a self-contained signal. It identifies an extended period in which global temperatures have consistently been exceptionally high relative to the preindustrial baseline used in the report.

The WMO also recorded continued increases in concentrations of carbon dioxide, methane and nitrous oxide in 2025, based on data from individual monitoring stations. These gases are included in the assessment alongside physical indicators, rather than as a separate issue. The report says their rising concentrations accompany continuing warming of the atmosphere and ocean, as well as ice loss.

Ice loss and rising seas remain part of the same assessment

Glaciers continued to lose mass, while Arctic and Antarctic sea ice have declined sharply in recent years. Global sea levels are also rising at an accelerating rate. The supplied WMO reporting does not assign a specific cause to that acceleration, nor does it quantify future consequences for individual coastlines or communities. It does establish that sea level is among the indicators moving in a concerning direction.

These measures are recorded through different methods and over different timescales, but the report places them in the same annual assessment. That approach does not erase the distinctions between glaciers, sea ice and sea level. Rather, it gives each indicator a place within an account of how heat is retained and distributed through the Earth system.

That distinction is important when reading an annual climate assessment. The report documents conditions and trends across global measures. It also notes that 2025 brought high-impact weather events, including intense heat, heavy rainfall and tropical cyclones, which caused disruption and devastation in different parts of the world. The evidence provided does not establish a specific link between every event and the indicators in the report, so those developments should be read as part of the year’s observed context rather than as a single causal chain.

The practical value of the WMO’s latest assessment lies in the combined view. Temperature rankings alone can obscure the role of the ocean, while ice and sea-level observations can be read as separate stories. The energy imbalance provides a common measure for understanding why those records belong in the same global account. In 2025, that measure reached a new high, while ocean heat set a record and the latest 11-year period remained the warmest on record.

For now, the report offers a detailed status check rather than a forecast. Its findings show that several of the climate system’s core indicators continued to change in 2025, and that the heat retained by Earth was higher than at any point in the observational record beginning in 1960.

Featured image. Source: Pexels. Credit: ArtHouse Studio. License: Pexels License.