The WMO released its State of the Global Climate report 2025 on World Meteorological Day, 23 March 2025. The report paints a stark picture: every major climate indicator is worsening, the decade 2015‑2025 marks the hottest 11‑year stretch on record, and for the first time the Earth’s energy imbalance has reached its highest level in a 65‑year record.
Key Developments (2025)
- All primary climate indicators (temperature, sea‑level rise, extreme events) are on an upward trajectory.
- 2025 ranks as the second or third hottest year since records began, averaging 1.43 °C above the 1850‑1900 baseline.
- The report introduces energy imbalance as a core metric, now at a record high.
- Rising concentrations of greenhouse gases have pushed the system out of equilibrium for at least 800,000 years.
- The ocean continues to warm, absorbing heat equivalent to about 18 times the annual global human energy consumption for two consecutive decades.
- Extreme weather – intense heatwaves, heavy rainfall, and tropical cyclones – caused widespread disruption, underscoring economic and societal vulnerability.
- Arctic sea‑ice extent hit a near‑record low; Antarctic sea‑ice was the third lowest on record; glacier melt persisted unabated.
- Health impacts intensified: dengue cases surged to historic highs, and over 1.2 billion workers (≈ one‑third of the global workforce) face heat‑related occupational risks.
Important Facts
- Atmospheric CO₂, CH₄ and N₂O concentrations are at their highest in at least 800,000 years.
- The ocean has absorbed roughly 18 times the world’s annual energy use each year for the past 20 years.
- Sea‑ice loss contributes to albedo reduction, further accelerating warming.
- Dengue now threatens half of the world’s population, the fastest‑growing mosquito‑borne disease.
- Heat stress jeopardises productivity in agriculture and construction, with significant livelihood losses.
UPSC Relevance
Understanding the State of the Global Climate 2025 is crucial for GS III (Environment & Ecology) and GS II (International Relations) as the report is a collaborative effort of national meteorological services, UN partners, and scientific bodies. Questions on climate indicators, energy imbalance, and health impacts frequently appear in both prelims and mains. The data also feed into policy‑making discussions on the Paris Agreement, National Action Plans on Climate Change (NAPCC), and the Sustainable Development Goals (SDGs).
Way Forward
- Strengthen national monitoring networks to feed into the WMO data pool.
- Accelerate mitigation: enforce stricter emission standards for CO₂, CH₄ and N₂O, and expand renewable energy deployment.
- Enhance adaptation: develop heat‑action plans for vulnerable workers, improve early‑warning systems for extreme events, and invest in climate‑resilient infrastructure.
- Integrate health surveillance with climate data to curb dengue and other vector‑borne diseases.
- Support the United Nations World Water Development Report 2025 recommendations on glacier melt and snow‑cover loss to safeguard water security.
For aspirants, memorising the headline figures (1.43 °C warming, record energy imbalance, 1.2 billion workers at heat risk) and linking them to policy frameworks will aid both objective‑type and essay‑type questions.