What Happened
- The WMO's State of the Global Climate 2025 report confirms that 2015–2025 are the hottest 11 consecutive years on record, with 2025 ranking as the second or third warmest year at approximately 1.43°C above pre-industrial (1850–1900) levels.
- Atmospheric CO2 is now around 50% higher than pre-industrial levels; global emissions reached record highs in 2025 despite a cooling La Niña phase that typically moderates global heat.
- Ocean heat reached record levels in 2025, accelerating sea-level rise and ocean acidification; Arctic and Antarctic sea ice declined to near-record lows, and glacier storage has significantly diminished.
- Human-driven climate change exacerbated severe weather events in 2025, including Central Asian heatwaves, East Asian wildfires, and Hurricane Melissa in the Caribbean.
- Scientists stress urgent emissions reductions and achieving net-zero targets by 2050 to prevent catastrophic warming, requiring a full transition away from fossil fuels.
Static Topic Bridges
Paris Agreement and the 1.5°C Threshold
The Paris Agreement (2015), adopted under the UNFCCC, commits nations to limiting global average temperature rise to well below 2°C above pre-industrial levels and pursuing efforts to limit it to 1.5°C. The Agreement operates on Nationally Determined Contributions (NDCs), which are countries' self-set climate action pledges reviewed every five years. The WMO 2025 report confirms that 2025 temperatures reached 1.43°C above pre-industrial levels — dangerously close to the 1.5°C threshold — underscoring that current NDCs are insufficient to meet the Agreement's goals.
- Paris Agreement adopted December 12, 2015; entered into force November 4, 2016
- 196 Parties to the UNFCCC signed the Agreement; India ratified on October 2, 2016
- India's NDC targets: 45% reduction in emissions intensity of GDP by 2030 (from 2005 baseline), 50% cumulative electric power installed capacity from non-fossil sources by 2030
- The "Production Gap Report" shows governments plan to produce 120% more fossil fuels by 2030 than levels consistent with 1.5°C; there is a 66% probability of breaching 1.5°C for at least one year between 2023–2027
Connection to this news: The WMO 2025 report directly benchmarks current global temperatures against the Paris Agreement threshold, making this a live test of whether the international climate framework is working as intended.
Ocean Acidification and Marine Ecosystem Impacts
Ocean acidification occurs when the ocean absorbs atmospheric CO2, forming carbonic acid and lowering pH levels. Since the industrial revolution, surface ocean pH has dropped by approximately 0.1 units (representing a 26% increase in acidity). This process disrupts calcification in marine organisms — corals, molluscs, and zooplankton — threatening reef ecosystems and food chains that billions depend on. Ocean heat content reaching record levels in 2025 compounds acidification stress on marine biodiversity.
- Oceans absorb approximately 25–30% of anthropogenic CO2 emissions and over 90% of excess heat from global warming
- Coral reefs cover less than 1% of the ocean floor but support about 25% of all marine species
- India's coral ecosystems: Gulf of Mannar, Lakshadweep, Gulf of Kutch, and Andaman and Nicobar Islands are the major sites
- India is a signatory to the Kunming-Montreal Global Biodiversity Framework (2022), which targets 30% ocean protection by 2030
Connection to this news: Record ocean heat in 2025 accelerates both acidification rates and coral bleaching events, creating compounding threats to India's coastal marine biodiversity.
Cryosphere Changes: Glaciers, Sea Ice, and Sea Level Rise
The cryosphere — all frozen water on Earth — acts as a global thermostat and freshwater reservoir. The Hindu Kush Himalaya (HKH) region, often called the "Third Pole," holds the largest store of freshwater outside the polar regions. Accelerating glacier retreat threatens long-term water security for over 1.65 billion people across South Asia. The 2025 report's finding of near-record-low polar sea ice accelerates sea-level rise, threatening low-lying coastal areas including Mumbai, Kolkata, and Chennai in India.
- The Himalayan glaciers feed 10 major rivers of Asia including the Indus, Ganges, and Brahmaputra
- IPCC AR6 (2021) projects a sea-level rise of 0.28–0.55 m by 2100 under low-emissions scenarios and 0.63–1.01 m under high-emissions scenarios
- India's National Action Plan on Climate Change (NAPCC, 2008) includes the National Mission for Sustaining the Himalayan Ecosystem (NMSHE)
- The Third Pole Environment (TPE) project monitors glacial retreat across 22 nations
Connection to this news: Near-record-low Arctic and Antarctic sea ice in 2025, combined with glacier retreat, directly translates to accelerated sea-level rise threatening India's 7,516-km coastline and over 250 million coastal residents.
Key Facts & Data
- 11 consecutive years (2015–2025) are the hottest on record globally
- 2025 global average temperature: approximately 1.43°C above pre-industrial baseline (1850–1900)
- Atmospheric CO2 is now ~50% higher than pre-industrial levels
- Governments' fossil fuel production plans are 120% above the level consistent with 1.5°C warming
- Ocean heat content and global sea levels both set new records in 2025
- WMO publishes the State of the Global Climate report annually; the 2025 edition was released in March 2026
- India's NAPCC identifies 8 National Missions covering solar energy, energy efficiency, water, Himalayas, green India, sustainable agriculture, strategic knowledge for climate change, and sustainable habitat