22 December 2025

• Climate: The Southern Ocean is absorbing more CO2 than models predicted, but scientists warn the gain could reverse abruptly.
• Agriculture: India's fertiliser subsidy exceeds Rs 2 lakh crore but the N:P:K ratio is dangerously skewed. Reforms are overdue.
• Environment: The Supreme Court's Aravalli definition could expose up to 60% of the landscape to mining.
• Legislation: President assents to the SHANTI Act 2025. A new rural employment guarantee with 125 days and biometric attendance replaces MGNREGA.
• Biodiversity: The IUCN Species Survival Commission elects its first Asian Chair.

GS area: GS 3 (Environment; Climate Change)

New research shows the Southern Ocean has absorbed more CO2 since the early 2000s than climate models projected. The mechanism involves Antarctic meltwater creating a layer of fresh water that prevents upwelling of carbon-rich deep water.

• Finding: the Southern Ocean carbon sink has strengthened since the early 2000s, absorbing more atmospheric CO2 than earlier model predictions indicated.
• Mechanism: freshwater from melting Antarctic glaciers and ice shelves sits on the ocean surface because it is lighter than salt water. This stratified surface layer suppresses upwelling of deep water that is naturally rich in dissolved CO2. The result is that less carbon escapes the ocean back to the atmosphere.
• Where carbon accumulates: dissolved CO2 is trapped at depths of approximately 100-200 metres below the surface, beyond the reach of immediate air-sea gas exchange.
• The risk: the stratification is not permanent. If the fresh surface layer breaks down due to storm mixing or circulation changes, the trapped CO2 could be released rapidly. This sudden reversal would overwhelm any gains from the strengthened sink.
• Policy relevance: natural carbon sinks are built into every net-zero scenario. If they are more volatile than assumed, climate targets become harder to achieve without faster emissions cuts.

Static linkage: Climate Change; Carbon Cycle; Ocean Circulation; IPCC

GS area: GS 3 (Economy; Agriculture)

India's fertiliser subsidy is the second-largest item in the Union Budget after food subsidy. The subsidy structure has created a severe nitrogen-phosphorus-potassium imbalance in Indian soils.

• Subsidy scale: approximately Rs 2 lakh crore in FY 2025-26, the second-largest Union Budget subsidy.
• Urea pricing: urea is sold at a statutory price of Rs 242 per 45-kg bag regardless of market or production cost. The government pays the difference to producers.
• Import dependence:
  • 78% of natural gas used to make urea is imported.
  • 90% of phosphatic fertilisers (DAP and others) are imported.
  • 100% of potassic fertilisers (MOP) are imported.
• Actual N:P:K ratio: Indian farmers apply nitrogen, phosphorus and potassium in an approximate ratio of 10.9:4.4:1.
• Recommended ratio: 4:2:1. This means far too much nitrogen is applied relative to potassium.
• Nitrogen use efficiency: only 35-40% of applied nitrogen is taken up by crops. The rest leaches into groundwater or volatilises as nitrous oxide, a potent greenhouse gas.
• Diversion: an estimated 20-25% of subsidised urea is diverted to non-agricultural uses, including the chemical industry.
• Proposed reforms: replacing per-unit subsidies with direct income transfers; rationalising the Nutrient Based Subsidy scheme to cover urea; issuing e-vouchers redeemable at points of sale; capping urea purchases per farmer per season.

The core distortion is that the subsidy price of urea has been frozen while market costs have risen. Farmers rationally over-use the cheapest input. Fixing this without harming small and marginal farmers requires a compensation mechanism that current state capacity may not be able to deliver cleanly.

Static linkage: Agriculture Policy; Fertiliser Sector; DBT; Soil Health

GS area: GS 3 (Environment); GS 2 (Polity)

The Supreme Court accepted the Central Government's argument that only areas with an elevation of 100 metres or more qualify as "Aravalli Hills" for regulatory protection purposes.

• Court's acceptance: the SC accepted the Centre's proposed 100-metre elevation criterion as the operative definition of "Aravalli Hills" for the purposes of mining restrictions and forest protection.
• Consequence: up to 60% of the broader Aravalli landscape could fall outside the definition and become accessible to mining and construction.
• Case name: Save Aravalli (ongoing Supreme Court matter concerning Aravalli mining and forest cover).
• Ecological functions of the Aravallis:
  • Acts as a green barrier preventing the Thar Desert from expanding eastward.
  • Recharges groundwater for Rajasthan, Haryana, Delhi and parts of UP.
  • Provides dust-control and windbreak functions for the NCR.
  • Contains a critical wildlife corridor linking Sariska Tiger Reserve (Rajasthan) with Ranthambhore National Park (Rajasthan) via forested patches.
• Legal background: the Forest Conservation Act 1980 and Supreme Court orders since 1996 (TN Godavarman case) have been the main instruments controlling Aravalli land use. The definition of "forest" in those orders is now being contested through this elevation criterion argument.

Static linkage: Forest Conservation Act 1980; Supreme Court Environmental Jurisprudence; Tiger Corridors

GS area: GS 3 (Science and Technology; Governance)

The President of India gave assent to the SHANTI Act 2025 during the Winter Session, completing its legislative passage. The Act opens nuclear energy to private Indian companies for the first time since Independence.

Key provisions (building on the December 19 coverage):

• AERB statutory status: the Atomic Energy Regulatory Board is now a statutory body under SHANTI, no longer dependent on executive orders for its existence and powers.
• Atomic Energy Redressal Advisory Council: a new appellate body for parties aggrieved by AERB decisions.
• Liability cap debate: the maximum operator liability of Rs 3,000 crore remains well below international comparators. Germany's nuclear liability is uncapped; Japan's cap after Fukushima was raised significantly. Critics argue the Indian cap will leave accident victims undercompensated.
• Supplier recourse removed: section removing the operator's right to recover damages from equipment suppliers aligns India with the Vienna Convention on Civil Liability for Nuclear Damage, which India has now effectively joined in spirit.

Static linkage: Atomic Energy Policy; AERB; Nuclear Liability; SHANTI Act

GS area: GS 2 (Governance; Social Justice); GS 3 (Economy)

Parliament passed the Viksit Bharat Guaranteed Rural Agricultural and Marginal Labour Growth Act 2025, replacing the Mahatma Gandhi National Rural Employment Guarantee Act 2005.

• Days guaranteed: 125 days of employment per rural household per year, up from 100 under MGNREGA.
• Funding ratio: 60% Central and 40% State for most states; 90% Central and 10% State for North-Eastern and Himalayan states (same preferential formula as MGNREGA).
• Technology mandate: biometric attendance and GPS geotagging of work sites are mandatory, aimed at eliminating ghost workers and inflated muster rolls.
• Agricultural alignment: a provision allows work pauses of up to 60 days during peak agricultural seasons, so workers can participate in sowing and harvest without losing their guaranteed days.
• Continuity: the asset-creation mandate (durable assets such as ponds, roads and afforestation) is retained. Gram Panchayat implementation remains the primary mechanism.

Static linkage: MGNREGA; Rural Employment; Fiscal Federalism; Gram Panchayat

GS area: GS 3 (Environment; Biodiversity)

The Supreme Court issued additional directions to protect the Great Indian Bustard from power-line collisions, after an earlier 2021 order requiring underground cabling in GIB habitat was challenged by power companies.

• Scientific name: Ardeotis nigriceps.
• Population: approximately 200 individuals remain globally, making it one of the most endangered birds in the world.
• State bird of Rajasthan: GIB is the state bird of Rajasthan, where the bulk of the remaining population lives in the Thar Desert and grasslands.
• Protection status: Schedule I of the Wildlife Protection Act 1972 (highest domestic protection); CITES Appendix I (international trade banned).
• Principal threat: collision with overhead power lines. GIB has poor frontal vision and cannot swerve quickly enough to avoid cables across its flight path.
• Previous SC order: in 2021 the Court directed that power lines in GIB habitat areas be placed underground. Power companies challenged this on cost grounds.
• Current direction: the SC has now strengthened implementation timelines and directed compliance reporting.

Static linkage: Wildlife Protection Act 1972; CITES; Critically Endangered Species; Rajasthan

GS area: GS 3 (Environment; Biodiversity)

The IUCN Species Survival Commission elected Vivek Menon as its Chair for 2025-2029, making him the first Asian to hold the position.

• IUCN SSC: the Species Survival Commission is the largest of IUCN's six commissions. It has over 11,000 volunteer experts across 180 countries. It is the scientific authority that produces the IUCN Red List of Threatened Species.
• Founded: 1949, the same year IUCN itself was established.
• IUCN Red List: the world's most comprehensive inventory of species' conservation status. It assigns categories from Least Concern to Extinct.
• Vivek Menon: Indian wildlife conservationist and founder of Wildlife Trust of India. His election for the 2025-2029 term is the first time a person from Asia has led the SSC.
• IUCN headquarters: Gland, Switzerland.

Static linkage: IUCN; Biodiversity Conservation; Species Survival Commission

GS area: GS 1 (Art and Culture; History)

The National Maritime Heritage Complex at Lothal, Gujarat is under construction and is envisioned as a world-class museum of India's maritime history, anchored at the site of the world's earliest known man-made dockyard.

• Location: Lothal, Gujarat, near Ahmedabad. The site is a major Indus Valley Civilisation settlement.
• Ministry: Ministry of Ports, Shipping and Waterways.
• International partner: National Maritime Museum, Amsterdam.
• Dockyard significance: Lothal's dockyard, dated to approximately 2400 BCE, is considered the world's earliest known man-made dockyard. It was equipped with a tidal lock to control water levels.
• IVC context: Lothal was a major trading and bead-manufacturing centre. Archaeological finds include evidence of trade with Mesopotamia and the Persian Gulf region.
• Complex scope: the planned complex includes a maritime heritage museum, a lighthouse museum, a coastal states' pavilion, a maritime research institute and a recreational maritime theme zone.

Static linkage: Indus Valley Civilisation; Maritime History; Ministry of Ports; Cultural Heritage

GS area: GS 2 (International Relations); GS 3 (Economy)

The IMF approved $206 million under its Rapid Financing Instrument for Sri Lanka following Cyclone Ditwah, demonstrating the use of this emergency facility for natural disaster balance-of-payments support.

• RFI purpose: the Rapid Financing Instrument provides fast balance-of-payments assistance to member countries without requiring a full IMF programme or ex-post performance reviews.
• Regular window: 50% of the member's IMF quota per year, 100% cumulative.
• Natural Disaster window: up to 80% of quota per year for countries facing balance-of-payments needs from a natural disaster.
• Repayment period: 3.25 to 5 years.
• Conditionality: lighter than a standard IMF Extended Fund Facility. No quarterly reviews or prior actions are required, though the borrower must present a policy intent letter.
• Sri Lanka context: Cyclone Ditwah caused infrastructure damage requiring emergency imports. Sri Lanka completed its earlier IMF Extended Fund Facility programme in 2023-24 after the 2022 economic crisis.

Static linkage: IMF Facilities; Balance of Payments; Sri Lanka Economy; India-Sri Lanka Relations

GS area: GS 1 (Geography); GS 2 (Inter-State Relations)

The Bhima River is a major tributary of the Krishna River system and is at the centre of an ongoing water-sharing dispute between Karnataka and Maharashtra.

• Origin: Bhimashankar hills on the Western Ghats, in Pune district of Maharashtra. Bhimashankar is also one of the 12 Jyotirlinga temples.
• Length: approximately 861 km.
• Direction of flow: southeast, from the Western Ghats through Maharashtra and into Karnataka and Telangana before joining the Krishna.
• Confluence: joins the Krishna River at the Karnataka-Telangana border.
• Drainage basin: approximately 70,614 square kilometres.
• Cultural significance: the river passes through Pandharpur in Maharashtra, where the Vitthal (Vithoba) Temple is located, a major pilgrimage site.
• Water dispute: Karnataka and Maharashtra have long-standing disagreements over the allocation of Bhima waters, particularly for irrigation in Solapur (Maharashtra) and the Bijapur-Gulbarga (Vijayapura-Kalaburagi) region of Karnataka.

Static linkage: Krishna River System; Inter-State Water Disputes; Western Ghats; Pilgrimage Geography

• Sariska Tiger Reserve in Alwar, Rajasthan and Ranthambhore National Park in Sawai Madhopur, Rajasthan are connected through a forested corridor that runs through the Aravalli hills. Disruption of this corridor would isolate the two tiger populations genetically.
• Lothal was first excavated by the Archaeological Survey of India under S.R. Rao between 1955 and 1960. It is being proposed for UNESCO World Heritage status.