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GS Paper: GS3

  • The Tailwinds from Lower Global Oil Prices

    Why in the News

    Global oil prices have fallen by nearly 16% since the beginning of the year, with Brent crude now around $61 per barrel. This decline comes despite geopolitical disruptions such as Ukraine’s drone attacks on Russian energy assets and ongoing U.S.–China tariff frictions.
    The fall signals a major shift in global oil dynamics, driven by technological advances, demand stagnation in OECD economies, and a surge in production from both OPEC+ and non-OPEC countries. For India, this could translate into substantial fiscal gains and macroeconomic stability, but the relief may be short-lived given the cyclical volatility of the oil market.

    Introduction

    Crude oil remains the world’s most traded and influential commodity, impacting not just transportation and industry but also fiscal and foreign policy. With over 100 million barrels produced daily, the oil market’s direction affects the global economy’s heartbeat.
    In recent months, a fascinating shift has occurred — a supply-driven decline in prices, contradicting traditional geopolitical expectations. For India, this moment offers both an opportunity for economic strengthening and a reminder of the need for strategic resilience in energy planning.

    Shifting Dynamics in the Global Oil Market

    What is Driving the Decline in Global Oil Prices?

    1. Technological disruptions: Innovations like shale extraction, horizontal drilling, and deep-sea exploration have boosted supply, lowering dependency on traditional producers.
    2. Stagnant demand in OECD economies: Due to slow post-COVID recovery, climate action, and EV adoption, demand growth has flattened.
    3. Emerging market growth plateau: Even China’s demand is tapering, with electric vehicles forming 50% of all new car sales.
    4. Supply overhang — Global production rose by 5.6 mbpd, outpacing demand growth of 1.3 mbpd, creating a glut that pushed prices down.

    How Have Global Producers and Consumers Reacted?

    1. OPEC+ internal friction: Saudi Arabia wants to restore full production to regain market share, while Russia seeks gradual output increases amid sanctions.
    2. Consumer advantage: Many countries have used this moment to replenish strategic petroleum reserves, stabilizing short-term demand.
    3. Floating stockpiles: Over 100 million barrels of unsold crude remain on tankers at sea, an indicator of market saturation.

    What Are the Contradictory Forecasts from Key Agencies?

    1. OPEC’s projection: Expects a slight supply deficit by 2026 (~50,000 bpd short).
    2. IEA’s projection: Predicts an unprecedented oversupply of 4 mbpd, aligning with think-tank estimates of Brent falling to $50/barrel.
    3. Divergence significance: Reflects deep uncertainty and potential volatility, crucial for policy planners like India.

    What Is the Broader Economic Context Influencing Oil Prices?

    1. IMF’s World Economic Outlook (2025): Describes global economy as “in flux, prospects remain dim.”
    2. Global growth slowdown: Projected at 3.2% in 2025 and 3.1% in 2026, with trade expansion slowing to 2.9%, down from 3.5% in 2024.
    3. Geopolitical wildcards: Any relaxation of sanctions on Russia, Iran, or Venezuela, or renewed West Asian tensions, could again disrupt supply-demand balance.

    What Does It Mean for India’s Economy?

    1. Import advantage: India’s oil import bill was $137 billion in 2024-25; every $1 decline in prices improves the current account deficit by $1.6 billion.
    2. Fiscal gains: Lower prices reduce subsidies and inflation, improving fiscal space and boosting public capital expenditure.
    3. Diplomatic breathing room: Reduced reliance on discounted Russian crude may ease U.S. trade frictions.
    4. Risk of remittance slowdown: A weaker West Asian economy may hit Indian remittances, exports, and investments.
    5. Cyclical caution: The oil market’s volatility means current relief could be short-lived, underscoring the need for energy diversification.

    Conclusion

    The decline in global oil prices provides India a strategic tailwind: strengthening fiscal health, reducing inflation, and supporting growth. Yet, this momentary advantage must not breed complacency. The future demands long-term energy resilience, investment in renewables, and strategic petroleum reserves. In an interconnected world, India must use this window to transition towards sustainable and self-reliant energy security before the next price cycle strikes.

    PYQ Relevance

    [UPSC 2013] It is said the India has substantial reserves of shale oil and gas, which can feed the needs of country for quarter century. However, tapping of the resources doesn’t appear to be high on the agenda. Discuss critically the availability and issues involved.

    Linkage: The 2013 question on India’s untapped shale reserves links to the article’s theme of global oversupply driven by the shale revolution; India’s limited shale development has kept it import-dependent, making lower global oil prices a temporary boon rather than true energy security.

  • Tapping the Shine: India must step in as a supplier of solar power to sustain its industry

    Why in the News

    India’s solar energy sector has achieved a historic milestone — generating 1,08,494 GWh in 2024–25, overtaking Japan and becoming the third-largest producer globally. This achievement mirrors India’s rapid growth in renewable capacity — solar module manufacturing expanded from 2 GW in 2014 to a projected 100 GW in 2025. However, beneath this success lies a dilemma: despite its potential, Indian-made solar modules are 1.5–2 times costlier than Chinese ones, and without robust export markets, the new manufacturing capacity may struggle. Hence, India’s push to emerge as a solar supplier to Africa under the International Solar Alliance represents not just climate diplomacy but a crucial economic strategy.

    Introduction

    India’s solar revolution is a remarkable blend of climate responsibility, industrial policy, and global ambition. The cost of solar power fell below coal in 2017 — a landmark that catalyzed private and public investment alike. Yet, with China’s dominance in module exports and India’s limited domestic absorption, the future of India’s solar manufacturing depends on securing new markets and deepening its international role as a sustainable energy leader.

    India’s Solar Power Success Story

    1. Massive Growth: India’s solar generation reached 1,08,494 GWh in 2024–25, overtaking Japan (96,459 GWh).
    2. Manufacturing Leap: Module manufacturing capacity expanded from 2 GW (2014) to 100 GW (2025 projection), a fiftyfold jump.
    3. Installed Capacity: India’s current installed solar capacity stands at 117 GW (as of September 2025).
    4. Comparative Rise: India now ranks 3rd globally, behind only China and the US, according to the International Renewable Energy Agency (IREA).

    What are India’s Solar Targets for 2030?

    1. Climate Commitments: India aims to source 50% of its power from non-fossil fuel sources by 2030.
    2. Solar Share: Around 250–280 GW of this will come from solar energy.
    3. Annual Addition Needed: India must add 30 GW/year until 2030, but has managed 17–23 GW/year in recent years.
    4. Challenge: This gap reflects issues in scaling production, costs, and grid integration.

    Why is Indian Solar Manufacturing Still Costlier?

    1. Higher Costs: Indian modules are 1.5–2x costlier than Chinese ones.
    2. Reasons:
      • China’s control over raw materials and solar supply chains.
      • Superior production lines and economies of scale.
      • India’s fragmented ecosystem and dependency on imported inputs.
    3. Export Comparison:
      • India exported 4 GW of modules to the US in 2024 (a temporary gain due to US restrictions on China).
      • China exported 236 GW the same year, a staggering 59x lead.

    How Can India Sustain Its Solar Manufacturing Boom?

    1. Need for New Markets: Without external demand, India’s large new capacity may remain underutilized.
    2. Africa as Opportunity:
      • Africa uses only 4% of its arable land for irrigation due to lack of rural power.
      • India can leverage this gap with solar-powered pumpsets, modeled on its PM Kusum Scheme.
    3. Diplomatic Leverage: India can push its solar expertise through the International Solar Alliance (ISA), showcasing schemes like PM Surya Ghar (urban rooftop) and PM Kusum (rural solar).
    4. Strategic Goal: To become a credible second supplier after China in emerging markets like Africa.

    Domestic Solar Initiatives as Models for Export

    1. PM Kusum Scheme: Promotes solar irrigation pumps for farmers, ideal for replication in Africa’s rural power-deficient regions.
    2. PM Surya Ghar Scheme: Encourages rooftop solar adoption in urban India, demonstrating scalable, decentralized power solutions.
    3. Outcome So Far: Adoption is moderate, but the models offer policy templates for developing nations.

    Conclusion

    India’s solar journey is a story of ambition and transition, from an energy importer to a renewable exporter. Yet, sustaining this momentum requires vision beyond borders. Becoming a solar supplier to Africa can ensure India’s manufacturing viability, strengthen climate diplomacy, and cement its place in the global green order. As the world tilts toward decarbonization, India’s light must not just illuminate its homes, but the developing world.

  • Great Green Wall of Andhra Pradesh

    Why in the News?

    Andhra Pradesh launched the Great Green Wall project, inspired by Africa’s Great Green Wall, to turn its 1,034 km Bay of Bengal coast into a bio-shield against cyclones and sea-level rise.

    About Great Green Wall of Andhra Pradesh:

    • Overview: Launched as a flagship coastal afforestation and climate resilience project; Forms part of the state’s Coastal Green Mission, aligning with SDG 13 (Climate Action) and India’s National Coastal Mission.
    • Objective: To protect Andhra Pradesh’s 1,034 km Bay of Bengal coastline from cyclones, tsunamis, and sea-level rise.
    • Inspired by: Africa’s Great Green Wall, adapted for India’s eastern coastal ecosystems.
    • Target: Enhance Andhra Pradesh’s green cover from 30% (2025) to 37% by 2029 and 50% by 2047 through sustained plantation and protection efforts.

    Key Features:

    • Geographical Coverage: Extends from Tirupati to Srikakulam, spanning the full 1,034 km coastline.
    • Width: Green belt stretches up to 5 km inland, with a variable width of 50–200 metres.
    • Core Species: Plantation includes mangroves, casuarina, palmyra, bamboo, and other shelterbelt trees.
    • Launch Site: Officially inaugurated at Surya Lanka Beach (Bapatla district) on 11 September 2025.
    • Community Role: Involves Self-Help Groups, eco-clubs, MGNREGS workers, fishermen, and local coastal communities.
    • Integration: Develops green buffers around ports, SEZs, industrial corridors, and aquaculture ponds.
    • Funding: Supported by CAMPA, MISHTI, Green Credit Programme, MGNREGS, CSR funds, and District Mineral Funds.

  • Scientists use ‘Atomic Stencils’ to make designer Nanoparticles

    Why in the News?

    Scientists from the United States and South Korea have developed a novel “atomic stencilling” method to coat gold nanoparticles with polymer patches, enabling unprecedented nanoscale precision in material design.

    What is Atomic Stencilling?

    • Overview: A novel nanofabrication technique where iodide atoms act as nanoscale masks (stencils) on gold nanoparticle surfaces, allowing scientists to “paint” polymer patches with atomic-level precision.
    • Mechanism: These polymer-coated patches create distinct functional zones on each nanoparticle, enabling controlled self-assembly into complex 3D nanostructures.
    • Innovation Context: Represents a breakthrough in atomic-scale material patterning, advancing nanotechnology toward programmable matter and precision material design.

    Advantages Offered:

    • Atomic Precision: Achieves atomic-scale patterning, precisely controlling patch size, geometry, and placement.
    • High Uniformity: Generates identical nanoparticles for consistent, predictable self-assembly behaviour.
    • Scalability: Allows large-scale synthesis of patchy nanoparticles with simplified processing.
    • Material Versatility: Compatible with multiple materials — gold, silver, silica — and adaptable to various polymer coatings.
    • Enhanced Self-Assembly: Promotes spontaneous formation of ordered 3D superlattices and metamaterials.
    • Functional Tunability: Enables customisation of surface chemistry, optical, and electronic properties.

    Key Applications:

    • Targeted Drug Delivery: Functional patches enable selective binding and controlled release to specific biological targets.
    • Catalysis: Distinct surface domains improve reactivity and catalytic precision.
    • Optoelectronics & Photonics: Supports creation of plasmonic and light-responsive metamaterials.
    • Energy Systems: Enhances charge transfer and stability in batteries and solar cells.
    • Smart Materials: Forms basis for programmable, self-assembling nanostructures with adaptive functions.
    [UPSC 2022] Consider the following statements:
    1. Other than those made by humans, nanoparticles do not exist in nature.
    2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics.
    3. Nanoparticles of some commercial products which enter the environment are unsafe for humans.
    Which of the statements given above is/are correct?
    Options: (a) 1 only (b) 3 only (c) 1 and 2 (d) 2 and 3 *

     

  • [22nd October 2025 ] The Hindu Op-ed: Unreliable air and noise data, real-time deception

    PYQ Relevance

    [UPSC 2023] Describe the key points of the revised Global Air Quality Guidelines (AQGs) recently released by the WHO. How are these different from its last update in 2005? What changes in India’s National Clean Air Programme are required to achieve these revised standards?

    Linkage: This PYQ directly links to the article’s focus on unreliable air quality data and weak monitoring under NCAP. Since pollution is a recurring UPSC theme, it highlights how aligning India’s policies with updated WHO standards demands scientific integrity and credible data.

    Mentor’s Comment

    When truth itself is blurred by flawed data, governance becomes an illusion. India’s air and noise monitoring systems, meant to be the foundation of environmental policy, are now under scrutiny for misleading the nation with inaccurate data. This is not just a story about malfunctioning sensors but about the collapse of scientific integrity, accountability, and public trust. The issue is no longer technical; it is constitutional, affecting citizens’ Right to Health and Life.

    Why in the News

    Two major failures in India’s environmental monitoring systems, Delhi’s Real-Time Air Pollution Network and Lucknow’s National Ambient Noise Monitoring Network, have exposed disturbing lapses in data integrity and governance. For the first time, even raw government data is being accused of misleading the public by understating pollution levels. Sensors placed in less polluted areas, faulty installations under tree cover, and outdated noise regulations have collectively raised alarm. This is significant because policy credibility, public health, and India’s global environmental reputation now stand compromised.

    Introduction

    Environmental governance in India has entered a critical phase. Despite massive investments and advanced technology, monitoring systems for air and noise pollution have failed to inspire confidence. When environmental data is unreliable, policies derived from it lose direction. As Delhi continues to suffocate under toxic smog and Lucknow’s soundscape exceeds permissible decibel levels, the larger question emerges — can real-time governance be meaningful when real-time data is deceptive?

    Policy Built on Sand: When Data Loses Credibility

    1. Flawed Sensors: Multiple audits, including the Comptroller and Auditor General (CAG) report, reveal that several air-quality sensors in Delhi are placed behind walls or under tree cover, leading to inaccurate readings.
    2. Misleading Reports: Delhi’s official Air Quality Index (AQI) often shows “moderate” levels even as citizens gasp through toxic smog, undermining public trust.
    3. Governance Crisis: When data itself is unreliable, policy decisions on stubble burning, vehicular restrictions, and industrial emissions lose legitimacy.
    4. International Impact: Weak monitoring erodes India’s credibility under the Paris Agreement and WHO Air Quality Standards.

    Sound of Silence: Noise Monitoring Failure in Lucknow

    1. Defective Network: Lucknow’s National Ambient Noise Monitoring Network fails to record accurate decibel levels; sensors are either malfunctioning or poorly calibrated.
    2. Outdated Regulation: India continues to rely on the Noise Pollution (Regulation and Control) Rules, 2000, which are inadequate and below WHO standards.
    3. Weak Enforcement: Penalties are minor, compliance is poor, and urban noise remains unregulated, especially around airports and religious places.
    4. Constitutional Concern: The Supreme Court recently transferred pleas on noise around Delhi Airport to the NGT, acknowledging that noise is a public health and fundamental rights issue under Articles 19 and 21.

    Science or Spectacle: Technology Without Transparency

    1. Spectacle over Substance: Governments deploy shiny monitoring hardware but ignore scientific calibration and audits.
    2. Opacity in Data: Citizens are misled when real-time pollution data is selectively downplayed to show moderate levels.
    3. Public Deception: Misleading indices delay judicial intervention and suppress citizen voices demanding clean air.
    4. Democratic Erosion: Governance becomes a contest between citizens and industries, with flawed numbers protecting inaction.

    The Human Cost: Health and Life Expectancy

    1. Health Impact: Exposure to NO₂ and PM2.5 not only weakens lungs but also accelerates myopia and aggravates asthma in children.
    2. Data from Reports: The Air Quality Life Index (Energy Policy Institute) shows that if Delhi met WHO air standards, life expectancy would rise by 8.2 years.
    3. National Toll: Across India, air pollution cuts life expectancy by nearly 5 years, making this a silent epidemic.
    4. Flawed Data = Lost Lives: When monitoring fails, policies fail, and citizens continue to breathe poison unknowingly.

    Restoring Credibility: Science as the Foundation

    1. Independent Oversight: India lacks an independent audit panel for environmental monitoring, unlike global norms.
    2. Enforcement Gaps: Though CPCB has clear guidelines on sensor location and calibration, implementation remains lax.
    3. Need for Citizen Oversight: Making raw data publicly accessible and encouraging third-party audits will restore trust.
    4. Beyond Bureaucracy: Environmental monitoring should be treated not as a formality, but as a scientific and ethical duty.

    Conclusion

    India’s real-time air and noise monitoring crisis is a wake-up call. The credibility of environmental governance rests not on political optics but on scientific truth. Without transparent data and independent audits, policies lose legitimacy and citizens lose trust. The real cost is borne not in GDP but in children’s lungs and sleepless nights. Science, integrity, and public accountability must anchor India’s environmental data revolution, else we risk turning real-time monitoring into real-time deception.

  • What is Rangarajan Poverty Line?

    Why in the News?

    After the C. Rangarajan Committee (2014) set India’s last official poverty line, economists from the Reserve Bank of India (RBI) have now revisited and updated the estimates using new household consumption data from Household Consumption Expenditure Survey (HCES) 2022–23.

    Evolution of Poverty Measurement in India:

    1. Planning Commission (1962): ₹20 (rural) and ₹25 (urban) per month; excluded health and education.
    2. Dandekar & Rath Committee (1971): Calorie-based standard (2250 kcal/day).
    3. Y. K. Alagh Committee (1979): Calorie-linked poverty line (2400 kcal rural; 2100 kcal urban).
    4. Lakdawala Committee (1993): Introduced state-specific and composite consumption baskets.
    5. Tendulkar Committee (2009): Uniform basket for rural/urban; ₹816 rural and ₹1000 urban (2011–12); shifted from calorie to expenditure-based poverty.

    About C. Rangarajan Committee on Poverty Estimation:

    • Objective: To evolve a broader and realistic poverty metric incorporating food, health, education, clothing, and shelter costs, beyond calorie-based norms.
    • Overview: Formed by the Planning Commission in 2012, chaired by Dr. C. Rangarajan, former RBI Governor, to review India’s poverty measurement methodology.
    • Report Submission: Submitted in June 2014; became a major benchmark in the debate on India’s official poverty line and methodological framework.
    • Definition of Poverty: Based on Monthly Per Capita Expenditure (MPCE) ₹972 (rural) and ₹1,407 (urban) at 2011–12 prices, equating to ₹32/day (rural) and ₹47/day (urban).
    • Data & Methodology: Used Modified Mixed Reference Period (MMRP) consumption data with separate rural–urban baskets, adjusting for state-wise price differentials.
    • Poverty Estimate (2011–12): Found 29.5% of India’s population below the poverty line.
    • Key Revision over Tendulkar: Expanded consumption basket to include education, healthcare, rent, transport, and other essentials; replaced calorie-based with expenditure-based cost-of-living approach.

    RBI 2025 Update (DEPR Study):

    • Source & Method: Conducted by RBI’s Department of Economic & Policy Research (DEPR) using HCES 2022–23 data for 20 states; retained Rangarajan framework.
    • New Price Index: Created a Poverty Line Basket (PLB) index instead of CPI reflecting actual consumption inflation more accurately.
    • PLB Composition: Rural PLB had 57% food share (vs 54% in CPI); Urban PLB had 47% (vs 36% in CPI).
    • Key Findings:
      • Rural Odisha poverty fell from 47.8% → 8.6%; Urban Bihar from 50.8% → 9.1%.
      • Lowest Poverty: Himachal Pradesh (0.4% rural), Tamil Nadu (1.9% urban).
      • Highest Poverty: Chhattisgarh (25.1% rural; 13.3% urban).
    • Significance: Confirms broad-based poverty decline yet highlights regional disparities; renews calls for a new official poverty line reflecting modern consumption trends.
    [UPSC 2019] In a given year in India, official poverty lines are higher in some States than in others because
    Options: (a) poverty rates vary from State to State
    (b) price levels vary from State to State *
    (c) Gross State Product varies from State to State
    (d) quality of public distribution varies from State to State

     

  • What are Transient Lunar Phenomena (TLP)?

    Why in the News?

    For centuries, astronomers and observers have recorded strange, short-lived visual events on the Moon’s surface, known as Transient Lunar Phenomena (TLPs).

    Transient Lunar Phenomena (TLPs)

    About Transient Lunar Phenomena (TLPs):

    • What is it: Short-lived flashes, glows, or hazy patches observed on the Moon’s surface, lasting seconds to several hours before fading.
    • Observation History: Reported for over a thousand years, including Apollo 11 astronauts (1969) who noted a luminous lunar glow.
    • Appearance Types: Include reddish glows, star-like flashes, and mist-like obscurations.
    • Active Regions: Concentrated around Aristarchus and Plato craters, considered the most dynamic lunar zones.
    • Scientific Implication: Suggests that the Moon remains geologically active, contradicting earlier assumptions of total dormancy.
    • Theories on Origin: Scientists propose several explanations for TLPs:
      1. Lunar Outgassing: Trapped gases such as radon or argon may escape through fissures, triggered by gravitational stresses or surface heating, causing dust or gas to glow or reflect sunlight.
      2. Meteoroid Impacts: Frequent meteoroid collisions on the Moon’s airless surface produce brief, intense flashes, accounting for many observed TLPs.
      3. Electrostatic Dust Levitation: Charged lunar dust particles, activated by solar radiation, may levitate and scatter light, producing transient luminous effects.
      4. Atmospheric Distortion on Earth: Some TLPs may be optical artifacts, caused by turbulence or refraction in Earth’s atmosphere altering the Moon’s apparent brightness or colour.

    Recent Research and Monitoring:

    • Observation Technology: Use of automated telescopes and CCD (charge-coupled device) imaging systems for real-time detection.
    • Space Missions: NASA’s Lunar Reconnaissance Orbiter (LRO) and ISRO’s Chandrayaan series monitor gas release and new impact craters.
    • Spectroscopic Evidence: Studies of Aristarchus Plateau show episodic radon emissions, supporting the outgassing theory.
    • Integrated Monitoring: Global programs combine optical, seismic, and spectrometric data to validate events.
    • Scientific Aim: To understand lunar surface dynamics, internal processes, and signs of ongoing geological activity.

  • Indian wolf (Canis lupus pallipes) to be classified as new species by IUCN

    Why in the News?

    The IUCN has separately evaluated the Indian wolf (Canis lupus pallipes) from the gray wolf, suggesting it may be recognised as a distinct Canis species.

    Indian wolf (Canis lupus pallipes) to be classified as new species by IUCN

    About Indian Wolf (Canis lupus pallipes):

    • Overview: Also called the Peninsular Wolf or Indian Grey Wolf; proposed as Canis indica owing to genetic divergence 110,000–200,000 years ago.
    • Distinct Lineage: Genomic studies identify it as the oldest surviving wolf lineage, basal to all other Canis lupus subspecies.
    • Distribution: Found across Deccan Plateau, Gujarat, Rajasthan, Madhya Pradesh, Maharashtra, Karnataka, and Andhra Pradesh, extending into Pakistan and Iran; only 12.4 % of its range lies inside protected areas.
    • Population Status (2025): Estimated 2,877–3,310 individuals (IUCN Red List 2025) — classified as Vulnerable.
    • Legal Protection: Listed in *Schedule I of the Wildlife (Protection) Act, 1972, prohibiting hunting, trapping, or killing <citation needed>.
    • Habitat: Prefers scrublands, dry grasslands, and thorn forests, increasingly threatened by agriculture, solar projects, and highways.
    • Ecological Role: Functions as a top predator regulating prey such as blackbuck, chinkara, hares, and rodents in India’s open ecosystems.
    • Social Behaviour: Lives in packs of 6-8 members, exhibiting cooperative hunting and silent coordination strategies.

    Evolutionary and Taxonomic Significance:

    • Early Divergence: Fossil and genetic data show divergence from Eurasian and Himalayan wolves well before the last Ice Age, evolving within India’s semi-arid zones.
    • Evolutionary Importance: Serves as a key model for studying wolf evolution, adaptation, and behaviour in tropical and dry environments.
    • Taxonomic Debate: Researchers propose recognition as a distinct species (Canis indica) based on unique genetic, ecological, and behavioural traits.
    [UPSC 2024] Question: Consider the following statements:

    Statement-I: The Indian Flying Fox is placed under the “vermin” category in the Wild Life (Protection) Act, 1972.

    Statement-II: The Indian Flying Fox feeds on the blood of other animals.

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

    Options: (a) Both statement I and Statement II are correct and statement II explains statement I

    (b) Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I

    (c) Staement- I is correct , but Statement II is incorrect*

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

     

  • IMO’s 2023 Greenhouse Gas (GHG) Strategy

    Why in the News?

    The International Maritime Organisation (IMO) delayed a vote on its 2027 carbon pricing plan under the 2023 Greenhouse Gas (GHG) Strategy after U.S. pressure, stalling efforts for net-zero shipping by 2050.

    What the IMO is trying to achieve?

    • Decarbonisation Goal: Targets net-zero emissions in global shipping by 2050, aligning with the Paris Agreement’s 1.5 °C limit; shipping contributes 2–3 % of global CO₂.
    • Carbon Intensity Reduction: Implements fuel-efficiency standards and CIIs to cut CO₂ per tonne-mile of cargo transported.
    • Fuel Transition: Promotes shift from heavy fuel oil to green ammonia, methanol, hydrogen, and biofuels, supported by a global carbon pricing framework.
    • Equitable Transition: Upholds common but differentiated responsibilities, offering financial and technological aid to developing and island nations.
    • Market-Based Mechanisms: Developing carbon-pricing and fuel-levy systems to internalise environmental costs and fund innovation.
    • Regulatory Uniformity: Seeks to avoid fragmented regional rules (e.g., EU ETS) by maintaining global maritime emission standards.

    About IMO’s 2023 Greenhouse Gas (GHG) Strategy:

    • Adoption: Finalised in July 2023 at Marine Environment Protection Committee (MEPC-80) (London) under the MARPOL Annex VI framework.
    • Carbon Intensity Targets: Cut 40 % by 2030 (vs 2008) and strive for 70 % by 2040.
    • Net-Zero Timeline: Achieve full sectoral decarbonisation by 2050.
    • Zero/Low-Emission Fuels: Ensure 5 % (aspire 10 %) of shipping energy from near-zero-GHG fuels by 2030; expand hydrogen and electrified propulsion.
    • Fuel & Emission Standards: Introduce Global Fuel Standard (GFS) and Global Pricing Mechanism (GPM) by 2027, covering ships above 5,000 GT (~85 % of emissions).
    • MRV Framework: Strengthen monitoring, reporting, and verification with emission databases and compliance audits.
    • Support Mechanisms: Establish GHG Fund to assist developing states in retrofits, technology adoption, and port upgrades.

    Significance: 

    • Global Climate Milestone: First binding, worldwide roadmap for a high-emission transport sector outside aviation.
    • Regulatory Shift: Moves from voluntary action to enforceable standards in maritime law.
    • Strategic Impact: Positions the IMO as a key climate-governance body, linking trade regulation and environmental responsibility.
    [UPSC 2024] According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions?

    Options: (a) Locomotives using fossil fuels

    (b) Ships using fossil fuels

    (c) Extraction of metals from ores

    (d) Power plants using fossil fuels*

     

  • Arsenic Toxicity in Rice Cultivation

    Why in the News?

    A recent study has revealed that the composition of microbial communities in rice paddies critically determines the buildup of arsenic compounds in rice grains.

    Arsenic Toxicity in Agriculture:

    • Overview: Arsenic (As) is a potent carcinogen and phytotoxin, bioaccumulating in rice and posing severe health and agronomic risks in Asian paddies.
    • Mechanism in Flooded Fields: Under anaerobic conditions, microbes convert arsenic into soluble, bioavailable forms that rice roots readily absorb.
    • Toxic Compounds: Organic forms like dimethylarsinic acid (DMA) and dimethylated monothioarsenate (DMMTA) cause straighthead disease, producing sterile, erect panicles and yield losses up to 70 %.
    • Speciation vs. Concentration: Toxicity depends on arsenic speciation, not total soil As levels, even low-As soils may cause poisoning.
    • Geographic Hotspots: Severe in West Bengal, Bihar, and Bangladesh, where arsenic-laden groundwater is used for irrigation.

    About Soil Age and Microbial Composition:

    • Research Insight: Study by Peng Wang (Nanjing Agricultural University) shows soil age dictates microbial dominance and arsenic behaviour.
    • Young Soils (< 700 yrs): Dominated by arsenic-methylating bacteria that convert inorganic As into toxic organic forms (DMA, DMMTA).
    • Old Soils (> 700 yrs): Rich in demethylating archaea that detoxify As by breaking down methylated compounds.
    • Global Microbiome Survey: Across 801 paddy soils, identified 11 methylators and 6 demethylators as key toxicity predictors.
    • Risk Threshold: When methylator: demethylator ratio > 1.5, probability of straighthead disease rises sharply.

    How does Microbial balance govern Arsenic toxicity?

    • Biological Equilibrium: Arsenic toxicity depends on balance between methylating bacteria (risk) and demethylating archaea (detoxification).
    • Environmental Triggers: Flood duration, oxygen, temperature, and hydrological shifts can tilt this balance toward higher toxicity.
    • Mitigation Measures: Mid-season drainage, silicon fertilisation, and microbial community management restore redox balance and reduce As uptake.
    [UPSC 2013] Which of the following can be found as pollutants in the drinking water in some parts of India?

    1. Arsenic 2. Sorbitol 3. Fluoride 4. Formaldehyde 5. Uranium

    Select the correct answer using the codes given below.

    Options: (a) 1 and 3 only (b) 2, 4 and 5 only (c) 1, 3 and 5 only* (d) 1, 2, 3, 4 and 5