Earth’s Energy Imbalance (IEE)

What is the Significance of Earth’s Energy Imbalance (EEI)? The State of the Global Climate 2025 was released by WMO. Read here to learn about the key findings.

The ‘State of the Global Climate 2025’ report, released by the World Meteorological Organisation (WMO) on World Meteorological Day (23 March) under the theme “Observing Today, Protecting Tomorrow”, highlights the accelerating pace of global warming and introduces Earth’s Energy Imbalance (EEI) as a crucial climate indicator for the first time.

The report offers a comprehensive assessment of the Earth’s changing climate system, underscoring the urgency of addressing anthropogenic climate change.

Earth’s Energy Imbalance (EEI)

Earth’s Energy Imbalance refers to the difference between the energy Earth receives from the Sun and the energy it radiates back into space.

In more precise terms, it is calculated as:

• Incoming solar radiation absorbed by Earth minus Outgoing long-wave radiation emitted back into space

This balance determines whether the planet is warming, cooling, or stable.

Positive vs Negative EEI

• A positive EEI indicates that Earth is gaining more energy than it loses, leading to global warming.
• A negative EEI suggests that Earth is losing more energy than it receives, resulting in cooling.

Currently, the Earth is experiencing a strongly positive EEI, which explains the sustained rise in global temperatures.

Why EEI is a Crucial Indicator

EEI is considered one of the most comprehensive indicators of climate change because it:

• Measures the rate at which heat accumulates in the climate system
• Reflects the net impact of greenhouse gas emissions
• Integrates changes across:
  • Atmosphere
  • Oceans
  • Cryosphere (ice)

Unlike surface temperature alone, EEI captures the total energy stored in the Earth system, making it a more reliable indicator of long-term warming trends.

Causes of Increasing Earth’s Energy Imbalance (EEI)

The report identifies several interlinked factors responsible for the rising energy imbalance:

• Rising Greenhouse Gas (GHG) Concentrations: Increased emissions of gases such as CO₂ trap heat in the atmosphere, reducing the amount of outgoing long-wave radiation. This is the primary driver of positive EEI.
• Reduction in Aerosol Emissions: Aerosols typically reflect sunlight into space. A reduction in aerosol pollution decreases this reflective effect, allowing more solar energy to be absorbed by the Earth.
• Increase in Trace Gases and Water Vapour: Higher concentrations of trace gases and water vapour enhance the greenhouse effect, further limiting heat loss to space.
• Changes in Clouds and Sea Ice: Reduced cloud reflectivity (albedo) leads to greater absorption of solar radiation. Melting sea ice decreases Earth’s reflectivity, exposing darker ocean surfaces that absorb more heat.

Together, these factors amplify warming through positive feedback mechanisms.

Key Findings of the Report

Rising Global Temperatures

• The year 2025 was recorded as the 2nd or 3rd warmest year on record, with global temperatures reaching approximately 43°C above the 1850-1900 baseline.
• This indicates that the world is approaching the 5°C threshold set under the Paris Agreement.

Hottest Decade on Record

• The period 2015-2025 represents the hottest 11-year span ever recorded, highlighting a persistent and accelerating warming trend.

Record Atmospheric CO₂ Levels

• The report notes that atmospheric CO₂ concentrations in 2024 reached their highest levels in the last 2 million years.
• This unprecedented rise underscores the scale of human impact on the climate system.

Ocean Heat Content at Record High

• The ocean heat content reached a new record high in 2025, indicating that oceans are absorbing the majority of excess heat generated by global warming.
• This has significant implications for: Sea-level rise, Marine ecosystems and Extreme weather events

Significance of EEI in Climate Science

The inclusion of EEI as a key indicator marks a shift in climate monitoring approaches. It allows scientists and policymakers to:

• Better understand the energy dynamics of the planet
• Predict long-term climate trends more accurately
• Assess the effectiveness of mitigation strategies

Earth’s Energy Imbalance (EEI) also helps explain why warming continues even when short-term temperature variations occur, as excess energy is largely stored in the oceans.

Implications for the Future

Accelerating Climate Change: A persistently positive Earth’s Energy Imbalance (EEI) indicates that global warming will continue unless emissions are drastically reduced.

Increased Climate Extremes: Higher energy in the climate system leads to more frequent and intense:

• Heatwaves
• Cyclones
• Floods and droughts

Threat to Cryosphere and Sea Levels: Melting glaciers and polar ice, driven by the rising Earth’s Energy Imbalance (EEI), contribute to sea-level rise, threatening coastal regions worldwide.

Urgency for Climate Action: The findings reinforce the need for:

• Rapid decarbonisation
• Transition to renewable energy
• Strengthening global climate governance

Conclusion

The State of the Global Climate 2025 report highlights a critical reality: the Earth is accumulating heat at an alarming rate, as evidenced by the rising Earth’s Energy Imbalance (EEI).

This indicator provides a holistic understanding of climate change, showing that global warming is not just about rising temperatures, but about a fundamental shift in the planet’s energy system.

As the world edges closer to critical climate thresholds, the report serves as a stark reminder that immediate and sustained action is essential to stabilise the Earth’s energy balance and secure a sustainable future.

Related articles:

• State of the Global Climate Report 2023