7 December 2025

• Nuclear triad: INS Aridaman's commissioning completes India's sea-based deterrence capability.
• Ecology: World Soil Day (December 5) highlights soil as a carbon sink, a living filter and a natural sponge for water.
• Digital: PM-WANI crosses 3.9 lakh hotspots; SIM binding compliance window is 60 days in.
• Wildlife: BNHS vulture release plans (January 2026) draw attention to the diclofenac threat.
• Space: Great Nicobar Crake remains a potential undescribed species with 24% faunal endemism on the island at stake.

GS area: GS III - Defence; Nuclear strategy

The commissioning of INS Aridaman as India's third SSBN completes the sea leg of the nuclear triad.

• Nuclear triad definition: A triad consists of three independent delivery systems for nuclear weapons: land-based ballistic missiles, aircraft-delivered bombs or cruise missiles and submarine-launched ballistic missiles.
• India's triad components:
  1. Land: Agni series ballistic missiles (Agni-IV and Agni-V are road-mobile ICBMs).
  2. Air: Mirage 2000 and Jaguar aircraft can deliver gravity bombs; Rafale can carry cruise missiles.
  3. Sea: INS Arihant, INS Arighat and INS Aridaman form the SSBN fleet.
• Strategic value of SSBNs: A submarine at sea is hardest to locate and destroy. This survivability provides a credible second-strike option even after an adversary's first strike.
• India's No-First-Use policy: India committed to NFU in 1998. Credible second-strike capability is the logical military requirement of an NFU doctrine.
• Advanced Technology Vessel project: The classified project that produced all three SSBNs. Construction is at the Ship Building Centre, Visakhapatnam.

Static linkage: India's nuclear doctrine; NFU policy; Strategic Forces Command; Agni missiles

GS area: GS III - Digital infrastructure; GS II - Government schemes

PM-WANI is a policy framework that enables small establishments to become public Wi-Fi access points without a licence.

• Current scale: 3.9 lakh hotspots active nationwide.
• Four-tier architecture (for prelims):
  1. Public Data Office (PDO): the kiosk, shop or establishment hosting the router.
  2. Public Data Office Aggregator (PDOA): the entity managing and billing across PDOs.
  3. App Provider: the company building the app through which users discover and pay.
  4. Central Registry: maintained by C-DoT (Centre for Development of Telematics) to register all actors.
• No licence requirement: This is the key policy innovation. Existing telecom law required a licence for any public internet service. PM-WANI created an exemption.
• Digital divide goal: The scheme targets rural markets, small towns and unserved communities where mobile data is the only connectivity but coverage is patchy.
• Comparison: Similar in structure to the Jio network's carrier-of-carriers model but open to any participant.

Static linkage: Telecom policy; Digital India programme; C-DoT

GS area: GS III - Environment; Agriculture

World Soil Day is observed on 5 December each year. The Food and Agriculture Organisation leads the observance.

• Soil as a carbon sink: Soils store more carbon than the atmosphere and all living vegetation combined. Healthy soils sequester carbon through organic matter accumulation.
• Soil as a living filter: Soil microorganisms (bacteria, fungi, protozoa) break down pollutants, pathogens and organic waste. This natural filtration protects groundwater.
• Soil as a water sponge: Good soil structure absorbs rainfall and releases it slowly. Degraded soils cause runoff and flooding.
• Soil biodiversity: One gram of healthy soil contains up to one billion bacteria and 200 metres of fungal hyphae.
• Urban soil challenge: Urban soils are compacted, contaminated and sealed under impermeable surfaces. Urbanisation removes the soil system's ecological functions.
• Restoration methods: Composting to add organic matter; reducing tillage; cover cropping; biochar addition.
• FAO role: The Global Soil Partnership under FAO coordinates soil data, policy and restoration efforts internationally.

Static linkage: Soil conservation; FAO; Carbon sequestration; Land degradation

GS area: GS I - Culture and heritage; North-east India

The 26th Hornbill Festival runs from 1 to 10 December 2025 at Kisama Heritage Village, Kohima.

• The Hornbill bird: The bird appears prominently in the warrior headgear of many Naga tribes. It is a symbol of vigilance and beauty.
• 17 tribes: All major Naga tribes participate. Each tribe's Morung (traditional youth dormitory) is re-created at Kisama.
• Cultural elements: Naga traditional wrestling, stone-pulling, fire-making demonstrations, local rice beer, tribal cuisine and handloom showcases.
• Tourism economy: The festival draws domestic and international tourists. Nagaland's handloom and handicraft sector benefits directly.
• Nagaland statehood: Nagaland became India's 16th state on 1 December 1963.

Static linkage: North-east India tribes; Naga heritage; State formation history

GS area: GS III - Monetary policy; Economy

The RBI's Rs 1 trillion OMO and $5 billion dollar-rupee swap are the largest single-week liquidity measures in recent years.

• Trigger: The rupee broke past Rs 89 per dollar in early December. Banks reported a liquidity deficit in the overnight market.
• OMO mechanics: RBI purchases government bonds from banks in the secondary market. Banks receive cash. The money supply in the economy increases.
• Swap mechanics: RBI provides dollars to banks against rupees. Banks get dollars to meet import payments. The rupee received by RBI is retired from circulation temporarily, easing currency pressure.
• Bond market effect: Large OMO purchases raise bond prices and reduce yields. This eases the government's borrowing cost.
• Inflation risk: Injecting liquidity when inflation is above target risks further price pressure. RBI is managing a trade-off between rupee stability and inflation control.

Static linkage: RBI instruments; Liquidity Adjustment Facility; Repo rate; Inflation targeting

GS area: GS III - Biodiversity; Conservation

The January 2026 BNHS vulture release in Assam brings two Critically Endangered species back to the wild.

• Role of vultures in ecosystems: Obligate scavengers that consume carcasses before bacteria spread disease. Removing vultures leads to an explosion in feral dog and rat populations. Both carry rabies.
• Speed of decline: The white-rumped vulture (Gyps bengalensis) declined by over 99 per cent in South Asia between 1992 and 2007. This is the fastest decline of any bird not caused by direct hunting.
• Diclofenac ban enforcement gap: Despite India's 2006 ban on veterinary diclofenac, the drug continues to enter the veterinary market via human-use formulations sold in large vials.
• Safe alternative: Meloxicam is equally effective as an anti-inflammatory for livestock and is safe for vultures.
• Breeding centre locations: BNHS operates at Pinjore (Haryana), Rani (Assam) and Rajabhatkhawa (West Bengal) under the Vulture Conservation Breeding Centre programme.

Static linkage: Wildlife Protection Act 1972; IUCN Red List; Ecosystem services

GS area: GS III - Biodiversity; Andaman and Nicobar Islands

The potential new species of crake photographed on Great Nicobar Island sits within a broader pattern of endemism.

• Great Nicobar Island: The southernmost island in the Andaman and Nicobar archipelago. Closest Indian territory to the Strait of Malacca.
• Endemism rate: Approximately 24 per cent of some fauna groups on Great Nicobar are endemic. They exist nowhere else on Earth.
• Rail family (Rallidae): Includes crakes, rails and coots. Many island-dwelling rails have evolved flightlessness due to low predator pressure. The Great Nicobar Crake's status is not yet determined.
• Infrastructure pressure: A large infrastructure project is proposed for Great Nicobar Island's southern tip. Environmentalists flag irreversible habitat loss for endemic species.
• ANET: The Andaman and Nicobar Environment Team conducts baseline surveys. Their data form the basis of endemism estimates.

Static linkage: Andaman and Nicobar geography; Biodiversity hotspots; Island endemism

GS area: GS III - Cybersecurity; GS II - Telecom regulation

The 90-day compliance window for SIM binding under the Telecommunication Cybersecurity Amendment Rules 2025 is now 60 days complete.

• Rule requirement: Messaging applications must link each user account to the SIM card used at registration.
• Sanchar Saathi mandatory pre-installation: All smartphones sold in India must pre-install the app from March 2026. This is a separate but related requirement.
• Web auto-logout: Applications must log users out of web sessions every six hours.
• Compliance challenge: Global messaging platforms (WhatsApp, Telegram, Signal) operate under different architectures. Binding to a SIM rather than a phone number requires design changes.
• Privacy tension: SIM binding creates a link between a user's physical identity (the SIM registered against Aadhaar) and their messaging account. Privacy advocates have raised concerns about surveillance potential.

Static linkage: Telecommunications Act 2023; Digital privacy; Aadhaar-linked SIM

• Nagaland statehood: 1 December 2025 was Nagaland's 62nd Statehood Day. The state was carved out of Assam on 1 December 1963 following the 16th Constitutional Amendment.
• Soil Carbon: The Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) estimates that land degradation costs $10 trillion per year in lost ecosystem services globally.