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Type: Prelims Only

  • Satellite data show India’s major deltas sinking

    Why in the News

    A global study published in Nature on 14 January reports widespread land subsidence across India’s major river deltas, driven largely by human activities and observed using Sentinel 1 satellite data.

    Study at a Glance

    • Data source Interferometric Synthetic Aperture Radar from ESA Sentinel 1
    • Period 2014 to 2023
    • Coverage 40 major global deltas including 6 Indian deltas
    • Spatial resolution 75 metres
    • Population relevance Deltas support over 340 million people globally

    Indian Deltas Confirmed to be Sinking

    • Ganges Brahmaputra Delta, Brahmani Delta, Mahanadi Delta, Godavari Delta, Cauvery Delta and Kabani Delta.
    • More than 90 percent area affected in Ganges Brahmaputra, Brahmani and Mahanadi deltas.

    Key Quantitative Findings

    • Brahmani delta: 77 percent area sinking at more than 5 mm per year
    • Mahanadi delta: 69 percent area sinking at more than 5 mm per year
    • In Ganges, Brahmani, Mahanadi, Godavari and Kabani,
       Subsidence rate exceeds regional sea level rise
    • Godavari delta: Even 95th percentile subsidence exceeds projected global sea level rise under worst climate scenario
    • Kolkata: Subsidence equals or exceeds delta average due to urban load and resource extraction

    Major Human Drivers Identified

    • Unsustainable groundwater extraction: Ganges Brahmaputra and Cauvery deltas
    • Rapid urbanisation: Brahmani delta
    • Reduced sediment flux: Mahanadi and Kabani deltas
    • Population pressure: Intensifies compaction and land lowering
    [2018] Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? 

    1. Decreased salinity in the river 

    2. Pollution of groundwater 

    3. Lowering of the water-table 

    Select the correct answer using the code given below: 

    (a) 1 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3

  • PM Modi highlights Parbati Giri’s contribution to freedom struggle

    Why in the news

    Prime Minister Narendra Modi paid tribute to Parbati Giri on her birth centenary, highlighting her role in India’s freedom movement and post independence social service. She was also remembered earlier in Mann Ki Baat.

    Who was Parbati Giri

    • Freedom fighter from Odisha
    • Known as “Mother Teresa of Western Odisha”
    • Actively participated in the Quit India Movement
    • Joined the freedom struggle at just 16 years of age

    Role in freedom struggle

    • Took part in the Quit India Movement of 1942
    • Represented the contribution of women and tribal regions in the national movement
    • Part of the broader mass based resistance against colonial rule

    Post-independence contributions

    • Dedicated her life to social service
    • Worked extensively for Tribal welfare, Healthcare and Women empowerment
    • Established orphanages and welfare institutions
    • Focused on upliftment of the poor and marginalised

    UPSC Prelims pointers

    • Parbati Giri was associated with Quit India Movement
    • Belonged to Odisha
    • Known for lifelong tribal and social welfare work
    • Frequently cited in context of unsung freedom fighters
    [2011] Which one of the following observations is not true about the Quit India Movement of 1942? 

    (a) It was a non-violent movement 

    (b) It was led by Mahatma Gandhi 

    (c) It was a spontaneous movement 

    (d) It did not attract the labour class in general

  • India expands GHG emission intensity regime to four more sectors

    Why in the news

    • The Union Government has expanded the Greenhouse Gas Emission Intensity reduction regime to four additional industrial sectors under amended rules notified by the Ministry of Environment, Forest and Climate Change.
    • The move operationalises India’s Carbon Credit Trading framework and strengthens compliance based climate mitigation.

    Newly included sectors

    • Petroleum refineries, Petrochemicals, Textiles, andSecondary aluminium
    • These are in addition to aluminium, cement, chlor alkali and pulp and paper sectors notified earlier.

    Coverage

    • 208 industrial units across India
      • 173 textile units
      • 21 petroleum refineries
      • 11 petrochemical units
      • 3 secondary aluminium units
    • Major public sector and private companies covered include
      • ONGC, Indian Oil, Bharat Petroleum, Hindustan Petroleum, Numaligarh Refinery and Reliance Industries.

    Legal and policy framework

    • Notified as Greenhouse Gases Emission Intensity Target Amendment Rules
    • Issued under the compliance mechanism of the Carbon Credit Trading Scheme, 2023
    • Enforced by the Central Pollution Control Board

    What is GEI (Greenhouse Gas Emission Intensity) target?

    • Mandatory reduction of GHG emissions per unit of output
    • Baseline year is 2023 to 24
    • Targets apply from 2025 to 26
    • Overall reduction of 3 to 7 percent by 2026 to 27

    Compliance and penalty

    • Units must either
      • Meet GEI targets
      • Or submit carbon credit certificates equal to the shortfall
    • Non compliance penalty
      • Imposed as environmental compensation by CPCB
      • Amount equals twice the average carbon credit price in that trading cycle
      • Payable within 90 days

    Climate significance

    • Aligns with India’s net zero target of 2070
    • Supports India’s Nationally Determined Contribution under the Paris Agreement
    • Promotes market driven decarbonisation instead of criminal penalties
    • Pushes energy efficiency and cleaner technologies in high emission sectors

    UPSC Prelims pointers

    • GEI focuses on emission intensity, not absolute emissions
    • Linked to Carbon Credit Trading Scheme 2023
    • Penalty equals 2 times average carbon credit price
    • Enforcement by CPCB
    • Supports India’s net zero 2070 pathway
    [2011] Regarding “carbon credits”, which one of the following statements is not correct? 

    (a) The carbon credit system was ratified in conjunction with the Kyoto Protocol

    (b) Carbon credits are awarded to countries or groups that have reduced greenhouse gases below their emission quota

    (c) The goal of the carbon credit system is to limit the increase of carbon dioxide emission

    (d) Carbon credits are traded at a price fixed from time to time by the United Nations environment programs

  • BNHS and NMCG launch project to protect Indian Skimmer

    Why in the news

    Bombay Natural History Society and National Mission for Clean Ganga have launched a new conservation project in Dehradun to protect the endangered Indian Skimmer in the Ganga Basin. The project was inaugurated by the Union Minister for Jal Shakti C R Patil.

    About Indian Skimmer

    • Scientific name: Rynchops albicollis
    • IUCN status: Endangered
    • Habitat: Large rivers, estuaries, sandbars and islands
    • India hosts around 90 percent of the global population, making conservation nationally critical.

    Core objective

    • Protection of river sandbars, which are crucial nesting and breeding habitats for Indian Skimmer and other riverine birds.

    Major threats addressed

    • Sand mining on riverbeds
    • Altered river flows and sudden water releases from dams
    • Human and livestock disturbance
    • Predation and habitat fragmentation

    Geographical coverage

    • National Chambal Sanctuary
    • Upper Ganga near Bijnor and Narora
    • Ganga Yamuna confluence at Prayagraj
    • Lower Ganga near the Vikramshila Gangetic Dolphin Sanctuary in Bihar

    UPSC Prelims pointers

    • Indian Skimmer nests on exposed river sandbars.
    • India holds the largest global population share of the species.
    • Project combines science, community participation, and river planning.
    • Linked with Namami Gange ecosystem restoration goals.
    [2014] With reference to Bombay Natural History Society (BNHS), consider the following statements: 1. It is an autonomous organization under the Ministry of Environment and Forests

    2. It strives to conserve nature through action-based research, education and public awareness

    3. It organizes and conducts nature trails and camps for the general public

    Which of the statements given above is/are correct? 

    (a) 1 and 3 only (b) 2 only (c) 2 and 3 only (d) 1, 2 and 3 only

  • Environmental (Protection) Fund

    Why in the news

    The Union Government notified detailed rules in January 2026 to operationalise the Environmental (Protection) Fund, a reform enabled by the Jan Vishwas Act, 2023.

    About

    • A statutory fund of the Government of India created to channel environmental penalties into pollution control, restoration, monitoring, research, and capacity building.
    • Converts monetary penalties into direct environmental remediation.

    Legal basis

    • Provided under the Environment (Protection) Act, 1986.
    • Detailed rules notified in January 2026.
    • Strengthened by the Jan Vishwas Act, 2023, which decriminalised several environmental offences while retaining penalties.

    Nodal authority

    • Administered by the Ministry of Environment, Forest and Climate Change or any body notified by the Central Government.

    Aim

    • Ensure that pollution penalties are recycled for environmental protection, remediation, clean technology promotion, and stronger regulatory institutions.

    Key features

    • Sources of funds
      • Penalties under the Air Act 1981 and Environment Act 1986
      • Interest from investments
      • Other prescribed sources
    • Permitted uses (11 activities)
      • Pollution prevention and mitigation
      • Remediation of contaminated sites
      • Environmental monitoring equipment
      • Clean technology research
      • IT enabled regulatory systems
      • Laboratory infrastructure
      • Capacity building of regulatory bodies
    • Revenue sharing
      • 75% of penalty proceeds to the Consolidated Fund of the State or UT
      • 25% retained by the Centre
    • Governance: Dedicated Project Management Units at Central and State levels
    • Oversight and transparency
      • Audit by the Comptroller and Auditor General of India
      • Centralised online portal developed by the Central Pollution Control Board
    [2019] Consider the following statements: The Environment Protection Act, 1986 empowers the Government of India to: 

    1. State the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought

    2. Lay down the standards for emission or discharge of environmental pollutants from various sources

    Which of the statements given above is/are correct? 

    (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

  • RBI proposes CBDC linkage on BRICS agenda

    Why in the news?

    Reserve Bank of India has advised the Government of India to place a proposal on linking Central Bank Digital Currencies (CBDCs) on the agenda of the BRICS 2026 Summit, which India will host.

    Key proposal

    • Link BRICS members’ CBDCs including India’s e-rupee for cross border trade finance and tourism payments.
    • Aim is faster settlements, lower transaction costs and reduced dependence on correspondent banking systems.
    • RBI clarifies this is not a formal de dollarisation push, but about efficiency and resilience.

    Background context

    • Builds on the 2025 BRICS Rio Declaration that called for interoperability of payment systems.
    • All core BRICS members Brazil Russia India China South Africa are running CBDC pilot projects, none fully launched yet.

    Central Bank Digital Currencies Vs Cryptocurrency

    • Issuing authority

        • CBDCs are issued and regulated by a country’s central bank such as the Reserve Bank of India
        • Cryptocurrencies are issued privately through decentralised blockchain networks with no sovereign authority, for example Bitcoin

    • Legal status

      • CBDCs are legal tender and must be accepted for payments within the issuing country
      • Cryptocurrencies are not legal tender in most countries and their legal status varies

    Strategic significance

    • Could challenge dollar centric payment rails indirectly amid rising geopolitical tensions.
    • Enhances international use of the rupee through regulated digital channels.
    • Fits India’s push for safe sovereign digital money over private stablecoins.

    Prelims pointers

    • CBDC is sovereign digital legal tender issued by a central bank.
    • RBI views CBDCs as less risky than stablecoins for monetary and financial stability.
    • BRICS was founded in 2009 and later expanded beyond the original five members.
    [2024] Consider the following statements in respect of the digital rupee: 

    1. It is a sovereign currency issued by the Reserve Bank of India (RBI) in alignment with its monetary policy

    2. It appears as a liability on the RBI’s balance sheet

    3. It is insured against inflation by its very design

    4. It is freely convertible against commercial bank money and cash

    Which of the statements given above are correct? 

    (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 4 only (d) 1, 2 and 4

  • Indigenous Light Water Reactor Push

    Why in the News?

    India is fast tracking the fabrication of an indigenous Light Water Reactor (LWR) as it opens the nuclear power sector to private participation and explores opportunities in the global nuclear export market.

    Key Development

    • The Department of Atomic Energy (DAE) is accelerating work on a 900 MWe indigenous LWR.
    • Design work began in 2015.
    • Objective is to complement India’s existing Pressurised Heavy Water Reactor (PHWR) fleet.
    • Indigenous LWR capability is expected to improve India’s bargaining power with foreign reactor vendors.

    Why LWRs Matter Globally

    • LWRs account for over 85 percent of global civil nuclear reactor capacity.
    • Used extensively by United States, Russia and France.
    • Dominant technology in international reactor trade and supply chains.
    • Without LWR integration, India risks limited access to global nuclear exports.

    LWR vs PHWR

    • Light Water Reactors

        • Use ordinary water as coolant and moderator
        • Require enriched uranium fuel
        • Simpler design, lower construction cost
        • Higher thermal efficiency
        • Strong economies of scale

    • Pressurised Heavy Water Reactors

      • Use heavy water (deuterium)
      • Operate on natural uranium
      • Core strength of India’s nuclear programme
      • Greater fuel flexibility
      • Less attractive in export markets dominated by LWRs

    Legal and Policy Context

    • The Sustainable Harnessing and Advancement of Nuclear Energy for Transforming India Act, 2025 enables:
      • Greater private sector participation
      • More imported LWR based projects
    • Addresses earlier liability concerns raised by foreign suppliers.
    • Supports projects like Kudankulam Nuclear Power Plant.

    Export and Strategic Angle

    • Indigenous LWR enhances India’s role in the global nuclear supply chain.
    • Emerging economies like UAE, Bangladesh, Saudi Arabia and Turkey are expanding nuclear capacity.
    • India could position itself as a supplier of:
      • PHWRs fuelled with thorium and low enriched uranium
      • Small Modular Reactors (SMRs) of 30 to 300 MWe

    Thorium and India

    • India has modest uranium but vast thorium reserves.
    • Using thorium with low enriched uranium in PHWRs can:
      • Ease fuel constraints
      • Support large scale nuclear expansion
      • Strengthen India’s unique reactor niche

    Prelims Pointers

    • LWRs dominate the global nuclear reactor market.
    • India’s proposed indigenous LWR capacity is 900 MWe.
    • PHWRs remain India’s technological strength.
    • Nuclear amendments aim to attract private and foreign investment.
    • SMRs are emerging as a tool of energy diplomacy, including by China.
    [2023] Consider the following statements: 

    Statement-I: India, despite having uranium deposits, depends on coal for most of its electricity production. 

    Statement-II: Uranium, enriched to the extent of at least 60%, is required for the production of electricity. 

    Which one of the following is correct in respect of the above statements? 

    (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I 

    (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-1 

    (c) Statement-I is correct but Statement-II is incorrect 

    (d) Statement-I is incorrect but Statement-II is correct

  • Indigenous Sodium Ion Battery Development in India

    Why in the News?

    The Chatterjee Group is considering commercial production of indigenous sodium ion batteries, following successful development of a high speed charging Na ion battery by its research arm.

    Key Development

    • Scientists at Research Institute for Sustainable Energy (RISE) have developed an India sourced sodium ion battery.
    • Battery charges up to 94 percent in 5 minutes.
    • Energy density: ~180 Wh per kg, comparable to lithium iron phosphate batteries.
    • Prototype may be ready for industrial scale deployment in 2 to 3 years.
    • Estimated commercial investment could reach 10 to 12 billion dollars.

    About Sodium Ion Batteries

    • Use sodium instead of lithium as the charge carrier.
    • Sodium is abundant, low cost and widely available.
    • Safer thermal profile compared to lithium ion batteries.

    Key advantages

    • No use of lithium, cobalt, nickel or copper.
    • Reduces dependence on critical mineral imports, especially from China.
    • Lower supply chain vulnerability.

    Commercial Potential Areas

    • Electric mobility, especially two and three wheelers due to fast charging needs.
    • Grid scale energy storage for renewable energy integration.
    • Off grid and rural energy systems where robust and low cost storage is required.
    [2025] In the context of electric vehicle batteries, consider the following elements: 

    I. Cobalt 

    II. Graphite 

    III. Lithium 

    IV. Nickel 

    How many of the above usually make up battery cathodes? 

    (a) Only one (b) Only two (c) Only three (d) All the four

  • BRICS Plus Naval Drills and South Africa Probe

    Why in the News?

    South Africa has initiated a probe into Iran’s participation in BRICS Plus naval exercises held near Cape Town, amid reports that President Cyril Ramaphosa wanted Iran to withdraw to avoid straining ties with the United States.

    Key Facts

    • Naval drills conducted in False Bay, close to Simon’s Town Naval Base.
    • Participating countries included China, Russia and Iran under the BRICS Plus framework.
    • Iranian naval vessels were observed operating alongside other participants throughout the exercise.
    • South Africa’s Defence Ministry ordered an inquiry to check whether presidential instructions were ignored or misinterpreted.

    Diplomatic Context

    • The drills coincided with US discussions on extending the African Growth and Opportunity Act (AGOA).
    • South Africa fears possible trade repercussions or exclusion from AGOA.
    • The US Embassy in South Africa expressed concern over Iran’s involvement.

    About BRICS Plus

    • The BRICS is a forum for cooperation among a group of leading emerging economies. The BRICS includes 10 countries – Brazil, China, Egypt, Ethiopia, India, Indonesia, Iran, Russian Federation, South Africa, United Arab Emirates.

    Prelims Pointers

    • BRICS Plus has both economic and security dimensions.
    • Naval exercises can have trade and diplomatic implications.
    • AGOA is a preferential trade programme of the United States for African countries.
    • South Africa follows a policy of strategic autonomy in foreign relations.
    [2025] Consider the following statements with regard to BRICS: 

    I. The 16th BRICS Summit was held under the Chairship of Russia in Kazan

    II. Indonesia has become a full member of BRICS

    III. The theme of the 16th BRICS Summit was Strengthening Multiculturalism for Just Global Development and Security

    Which of the statements given above is/are correct? 

    (a) I and II (b) II and III (c) I and III (d) I only

  • Second Range wide Dolphin Survey

    Why in the News?

    The Second Range wide Dolphin Survey has been launched from Bijnor, Uttar Pradesh under Project Dolphin to update dolphin population estimates, assess habitat quality and identify threats across India’s river systems.

    About Project Dolphin

    A national conservation initiative of the Government of India for protecting riverine and oceanic dolphins through habitat protection, scientific monitoring and community participation.

    Key details

    • Launched: 15 August 2020
    • Nodal Ministry: Ministry of Environment, Forest and Climate Change
    • Aim:
      • Conserve dolphin diversity in India
      • Address threats like pollution, habitat degradation, by catch and altered river flows
      • Involve local communities and stakeholders

    Key features

    • 10 year initiative with pan India coverage
    • Focus on riverine and oceanic species
    • Scientific surveys and monitoring for population trends
    • Linked with river ecosystem conservation and policy action

    Second Range wide Dolphin Survey

    • A pan India scientific estimation exercise to assess:
      • Dolphin population size
      • Distribution and habitat condition
      • Anthropogenic and ecological threats

    Covers riverine and estuarine dolphins in a structured manner.

    Implementation and coverage

    • Phase I:
      • Main stem of the Ganga from Bijnor to Ganga Sagar
      • Indus river system
    • Phase II: Brahmaputra, Ganga tributaries, Sundarbans delta and Odisha river and estuarine systems
    • Coordinating agency: Wildlife Institute of India
    • Implemented with State Forest Departments and conservation partners
    • Uses standardised protocols, hydrophones for acoustic monitoring and trained field teams

    Note: Oceanic dolphins in Indian waters include Indo-Pacific bottlenose (Tursiops aduncus), spinner (Stenella longirostris), seen along Gujarat, Kerala, Odisha coasts in Arabian Sea and Bay of Bengal.

    Previous Survey Findings (2021 to 2023)

    • Around 6,327 riverine dolphins recorded across India
    • Highest populations: Uttar Pradesh and Bihar
    • Followed by West Bengal and Assam
    • Small population of Indus River Dolphin recorded in the Beas system

    Prelims Takeaways

    • Project Dolphin was launched in 2020
    • Nodal ministry is MoEFCC
    • Second survey uses acoustic monitoring via hydrophones
    • Ganga and Brahmaputra systems are key dolphin habitats
    • India hosts both riverine and oceanic dolphins
    [2014] Other than poaching, what are the possible reasons for the decline in the population of Ganga River Dolphins? 

    1. Construction of dams and barrages on rivers

    2. Increase in the population of crocodiles in rivers

    3. Getting trapped in fishing nets accidentally

    4. Use of synthetic fertilizers and other agricultural chemicals in crop-fields in the vicinity of rivers

    Select the correct answer using the code given below: 

    (a) 1 and 2 only (b) 2 and 3 only (c) 1, 3 and 4 only (d) 1, 2, 3 and 4 only