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Subject: Environment

  • Cost of convenience, health hazards a a side effect of using digital tools

    Introduction

    India’s embrace of the digital revolution has been rapid and transformative. From smartphones to smart homes, electronics have become integral to urban living. However, this transformation carries a dark underbelly: the mounting crisis of e-waste. In 2025, India generated 2.2 million tonnes of e-waste, becoming the third-largest generator globally, after China and the United States. Despite having a formal recycling capacity of over 2.2 million MT, more than half of India’s e-waste is still processed informally, exposing millions to toxic substances. The issue is not just environmental but also a public health catastrophe, disproportionately affecting the poor and marginalised.

    Why is e-waste in the news?

    India’s e-waste problem is no longer a distant warning but an immediate crisis. The country has seen a 150% surge in e-waste since 2017–18 (0.71 MT to 2.2 MT in 2025), with projections of doubling by 2030. Cities like Seelampur (Delhi), Moradabad (UP), and Bhiwandi (Maharashtra) have emerged as hotspots of informal recycling, where toxic fumes and crude dismantling methods poison both workers and residents. Despite 322 formal recycling units, informal handlers dominate the sector, creating one of the sharpest contrasts between policy design and ground reality.

    The Escalating Burden of E-Waste

    1. Third-largest generator: India stands only behind China and the U.S., producing 2.2 MT of e-waste in 2025.
    2. Rapid growth: A 150% surge in seven years, expected to double by 2030.
    3. Urban hotspots: Over 60% of e-waste originates from just 65 cities; major hubs include Seelampur, Mustafabad, Moradabad, and Bhiwandi.

    Why informal recycling is a ticking time bomb

    1. Crude methods: Manual dismantling, open burning, and acid leaching without protective equipment.
    2. Toxic substances: Release of over 1,000 hazardous chemicals, including heavy metals (lead, cadmium, mercury, chromium), POPs (dioxins, furans), and fine particulate matter (PM₂.₅ and PM₁₀).
    3. Alarming air quality: PM₂.₅ levels in Seelampur exceed 300 µg/m³ — over 12 times higher than WHO’s safe limit of 25 µg/m³.

    How does e-waste impact human health?

    1. Respiratory illnesses: Workers show 76–80% prevalence of chronic bronchitis, asthma, persistent coughing (MDPI Applied Sciences, 2025).
    2. Neurological damage: Lead exposure linked to cognitive impairment, reduced IQ, attention deficits. WHO warns millions of children are at risk.
    3. Skin & ocular disorders: Rashes, burns, dermatitis; in Guiyu (China), exposure linked to miscarriages and preterm births.
    4. Genetic and systemic effects: DNA damage, oxidative stress, altered immune functions; children show higher vulnerability.
    5. Syndemic environment: E-waste risks compound poverty, malnutrition, and unsafe housing, worsening outcomes for urban poor.

    Policy response: Progress and gaps

    1. E-Waste (Management) Rules, 2022: Strengthened Extended Producer Responsibility (EPR), mandatory registration, incentives for formalisation.
    2. Weak enforcement: As of 2023–24, only 43% of e-waste was officially processed.
    3. Legal hurdles: Capping of EPR credit prices led to legal disputes with manufacturers.
    4. Gap: Informal handlers still dominate, undermining scientific recycling capacity.

    The Way Forward

    1. Formalise the informal: Integrate kabadiwalas through skill certification, PPE provision, healthcare, social security.
    2. Strengthen enforcement: Empower Pollution Control Boards, mandate digital tracking & audits.
    3. Expand medical surveillance: Health camps and long-term studies, especially on children in hotspots.
    4. Foster innovation: Promote local recycling technologies, decentralised treatment hubs.
    5. Raise awareness: Mass campaigns and school-level education on e-waste.

    Conclusion

    India’s digital empowerment cannot come at the cost of environmental collapse and human suffering. The e-waste crisis is not only a question of waste management but also of justice and public health. Unless India formalises its informal sector, strengthens enforcement, invests in technology, and raises awareness, the cost of convenience will continue to erode both ecosystems and human dignity.

    PYQ Relevance

    [UPSC 2018] What are the impediments in disposing the huge quantities of discarded solid wastes which are continuously being generated? How do we remove safely the toxic wastes that have been accumulating in our habitable environment?

    Linkage: The article on e-waste directly links to this PYQ as it highlights impediments like dominance of informal recycling, weak enforcement of E-Waste Rules, and lack of awareness, while also suggesting safe disposal measures such as formalisation, digital tracking, PPE use, decentralised hubs, and scientific recycling methods.

  • Geoengineering Proposals for Polar Regions found flawed

    Why in the News?

    A University of Exeter study found five major polar geoengineering methods ineffective and risky, failing criteria for responsible climate intervention.

    Geoengineering in Polar Regions: Study Findings

    Method Description Intended Benefit Key Findings & Limitations
    Stratospheric Aerosol Injection (SAI) Artificially releasing aerosols (SO₂, sulphur particles, TiO₂, CaCO₃) into the stratosphere to reflect sunlight. Reduce surface temperatures by blocking solar radiation.
    • Ineffective in polar winters (no sunlight) and of limited use in summers (ice already highly reflective).
    • Sudden termination can cause “termination shock” with rapid global warming.
    • Potential to disrupt global weather cycles, harming food and water security.
    • No global governance on costs or liability. Estimated cost: $55M/year per country (if 30 nations share).
    Sea Curtains / Sea Walls Massive buoyant barriers anchored to seafloor to block warm currents from reaching ice sheets. Slow melting of glaciers by insulating them from warm water.
    • Technically near-impossible in remote seas like Amundsen (Antarctica).
    • Extremely high costs — >$1 billion/km.
    • Threatens marine circulation, fish migration, and nutrient cycles.
    • Installation in harsh polar seas only possible for few months a year; requires custom-built ships.
    • Risk of toxic materials leaching into ocean.
    Sea Ice Management (Microbeads) Sprinkling glass microbeads over sea ice to increase albedo (reflectivity) and thicken ice. Preserve summer ice, slow down warming.
    • Requires 360M tonnes of beads annually — equal to world’s plastic production.
    • Major logistical and emissions challenges.
    • Beads dissolve quickly, reducing effectiveness.
    • Some studies show beads absorb sunlight, causing net warming.
    • Costly: $500B/year for Arctic deployment; requires 100M pumps, huge energy draw.
    Basal Water Removal Pumping subglacial meltwater from under Antarctic glaciers. Reduce glacier sliding, thus slowing sea-level rise.
    • Flawed logic: subglacial water is constantly replenished by frictional/geothermal heating.
    • Highly emissions-intensive and energy-consuming.
    • Requires continuous monitoring, maintenance, and heavy infrastructure.
    • Long-term sustainability questioned.
    Ocean Fertilisation Adding nutrients (e.g., iron) to stimulate phytoplankton growth, enhancing CO₂ absorption. Sequester more carbon in oceans.
    • No control over which phytoplankton species dominate, creating food chain imbalances. 
    • Could harm marine biodiversity and alter global nutrient cycles.
    • Needs deployment at massive, impractical scale.
    • Risk of side-effects outweighs uncertain benefits.

     

    [UPSC 2020] Consider the following activities:

    1. Spreading finely ground basalt rock extensively on farmlands

    2. Increasing the alkalinity of oceans by adding lime

    3. Capturing carbon dioxide released by various industries and pumping it into abandoned subterranean mines in the form of carbonated waters

    How many of the above activities are often considered and discussed for carbon capture and sequestration?

    Options: (a) Only one (b) Only two (c) All three* (d) None

     

  • Bihar adds 2 more Wetlands to Ramsar List

    Why in the News?

    India has added two new wetlands in Bihar, Gokul Jalashay (Buxar district) and Udaipur Jheel (West Champaran district), to the global Ramsar list of Wetlands of International Importance.

    Important Facts:

    • With this, India’s Ramsar sites rise to 93, consolidating its top rank in Asia and third in the world, after the UK (176) and Mexico (144).
      • Bolivia has the largest Ramsar wetland area (Llanos de Moxos wetlands – 6.9 million ha).
    • India’s Ramsar sites have expanded from 26 in 2012 to 93 in 2025, covering 13.6 lakh hectares, with 51 sites added since 2020.
    • Globally, there are 2,544 Ramsar sites.

    Facts about the two Wetlands:

    1. Gokul Jalashay (Buxar District):

      • Oxbow lake spread over 448 hectares on the southern edge of the Ganga River.
      • Acts as a flood buffer during high water events.
      • Supports 50+ bird species and provides livelihoods through fishing, farming, and irrigation.

    2. Udaipur Jheel (West Champaran District):

      • Oxbow lake covering 319 hectares, part of the Udaipur Wildlife Sanctuary ecosystem, formed by the Gandaki River.
      • Enhances ecological connectivity and supports the Central Asian Flyway for migratory birds.

    About the Ramsar Convention:

    • Establishment: Signed on 2 February 1971 in Ramsar, Iran.
    • Objective: Provide a framework for conservation and wise use of wetlands and their resources.
    • Functions:
      • Identify and designate wetlands of international importance.
      • Promote effective management of wetlands.
      • Foster international cooperation for conservation.
    • Members: 173 countries (as of 2025).
    • India and Ramsar:
      • India joined in 1982.
      • First Ramsar site: Chilika Lake, Odisha (1981).
      • Current total: 93 sites (Sept 2025), covering 13,60,718 hectares.
      • Growth: From 26 sites in 2012 to 93 in 2025 (51 added since 2020).
      • State-wise: Tamil Nadu has the highest (20), followed by Uttar Pradesh (10).
      • About 10% of India’s total wetland area is under Ramsar listing.
    • Montreux Record: List of Ramsar sites under threat of ecological change.
      • 48 sites globally (2025).
      • 2 Indian sites included: Keoladeo National Park (Rajasthan) and Loktak Lake (Manipur).
    • World Wetlands Day: Celebrated on February 2nd every year.
      • 2025 Theme: “Protecting Wetlands for Our Common Future”.

    Criteria for Declaration (9 Criteria):

    A wetland can be declared a Ramsar site if it meets at least one of these:

    1. Has unique, rare, or representative wetland types.
    2. Supports vulnerable, endangered, or endemic species.
    3. Provides critical habitat for waterfowl, especially during migration.
    4. Contains significant ecological, botanical, zoological, limnological, or hydrological features.
    5. Supports biodiversity conservation and scientific research.
    6. Provides ecosystem services like flood control, groundwater recharge, and water purification.
    7. Has cultural, spiritual, or recreational importance.
    8. Ensures sustainable livelihoods for local communities.
    9. Faces threats requiring international cooperation for conservation.
    [UPSC 2022] Consider the following pairs:

    Wetland/Lake Location

    1. Hokera Wetland — Punjab 2. Renuka Wetland — Himachal Pradesh

    3. Rudrasagar Lake — Tripura 4. Sasthamkotta Lake — Tamil Nadu

    How many pairs given above are correctly matched?

    Options: (a) Only one pair (b) Only two pairs* (c) Only three pairs (d) All four pairs

     

  • Cold Desert named India’s 13th UNESCO Biosphere Reserve

    Why in the News?

    UNESCO added India’s Cold Desert Biosphere Reserve (CDBR) to the World Network of Biosphere Reserves (WNBR) under the Man and the Biosphere (MAB) programme.

    With this, India now has 13 UNESCO-recognized biosphere reserves out of 18 designated nationally.

    What are UNESCO Biosphere Reserves?

    • Overview: Sites integrating biodiversity conservation + cultural heritage + sustainable development.
    • Programme: MAB (1971).
    • Designation Criteria:
      • Must include a protected core zone.
      • Must represent a unique biogeographical unit.
      • Involve local communities in conservation.
      • Potential to preserve traditional lifestyles.
    • Functions: Conservation, Development, Logistic Support.
    • Global Network (WNBR): 785 sites, 142 countries (2025); 7.4 million sq. km (~5% Earth’s surface); home to 275 million people.

    About Cold Desert Biosphere Reserve (CDBR):

    • Location: Lahaul–Spiti (Himachal Pradesh), part of Trans-Himalayan biogeographic province.
    • Constituents: Includes Pin Valley National Park, Kibber Wildlife Sanctuary, Chandratal Wetland, Sarchu Plains.
    • Biodiversity:
      • Flora:  732 vascular plants, incl. 30 endemic, 47 medicinal plants (Amchi / Sowa Rigpa).
      • Fauna: Snow leopard (flagship), Tibetan wolf, Himalayan ibex, blue sheep (800+ in Spiti), Himalayan snowcock, golden eagle, bearded vulture.
    • Communities: ~12,000 people; practice yak & goat herding, barley/pea farming, Tibetan herbal medicine, Buddhist monastic councils.
    • Significance: Boosts eco-tourism, climate research, community-led conservation, sustainable livelihoods. Supports climate-resilient development in fragile ecosystems.

    cold desert biosphere reserve

    Biosphere Reserves in India:

    • Total: 18 designated, of which 13 in UNESCO-WNBR (as of 2025).
    • First: Nilgiri BR (1986); Largest: Gulf of Kachchh (Gujarat); Smallest: Dibru-Saikhowa (Assam).
    • Scheme: Launched 1986; implemented by MoEFCC under MAB Programme.
    • Three zones: Each biosphere reserve is organised into-
      1. Core zone (strictly protected),
      2. Buffer zone (limited human activity such as research, grazing, and tourism permitted), and
      3. Transition zone (sustainable human settlements and economic activities allowed).
    • Funding: 90:10 (NE & Himalayan states); 60:40 (others).
    [UPSC 2019] Which of the following are in Agasthyamala Biosphere Reserve?

    Options: (a) Neyyar, Peppara and Shendurney Wildlife Sanctuaries; and Kalakad Mundanthurai Tiger Reserve*

    (b) Mudumalai, Sathyamangalam and Wayanad Wildlife Sanctuaries; and Silent Valley National Park

    (c) Kaundinya, Gundla Brahmeswaram and Papikonda Wildlife Sanctuaries; and Mukurthi National Park

    (d) Kawal and Sri Venkateswara Wildlife Sanctuaries; and Nagarjunasagar-Srisailam Tiger Reserve

     

  • Ganga River is drying faster than in 1,300 years: Report

    Why in the News?

    A recent study by researchers from IIT Gandhinagar and the University of Arizona warns that the Ganga River is drying at a rate unseen in more than a millennium.

    About Drying of the Ganga River: New Study Findings

    • Overview: Reconstructed streamflow since 700 AD using tree-ring records (Monsoon Asia Drought Atlas) and hydrological models. Validated against historic droughts and famines such as the Bengal famine.

    • Findings:

      • Between 1991 and 2020, multiple droughts lasted 4–7 years, the rarest in the past 1,300 years.
      • The 2004–2010 drought was the most severe in 1,300 years.
      • Post-1990s drying was 76% more intense than the worst 16th-century drought.

    • Causes:

      • Weaker monsoons from Indian Ocean warming and aerosol pollution.
      • Groundwater over-extraction reducing river baseflow.
      • Land-use change disrupting natural recharge.
    • Climate Models: Most fail to reproduce the drying trend, raising doubts about optimistic rainfall projections.
    • Implications: Severe threats to agriculture, 600 million livelihoods, Bay of Bengal ecosystems, and the 40% GDP share of the basin. Calls for adaptive water management.

    ganga

    About the Ganga River:

    • Length: ~2,525 km, the longest river in India.
    • Origin: Gangotri Glacier in Uttarakhand at 3,892 m elevation as Bhagirathi.
    • Formation: Named Ganga at Devprayag after meeting Bhagirathi and Alaknanda.
    • Course: Flows through Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, West Bengal before entering Bangladesh as Padma and emptying into the Bay of Bengal through the Sundarbans Delta.
    • Basin: Covers about 8.61 lakh sq. km, which is 26.4% of India’s area.

    • Tributaries:

      • Left bank: Ramganga, Gomti, Ghaghara, Gandak, Burhi Gandak, Koshi, Mahananda.
      • Right bank: Yamuna, Tons, Karamnasa, Sone, Punpun, Falgu, Kiul, Chandan, Ajoy, Damodar, Rupnarayan.
    • Population: Supports over 600 million people, making it the world’s most densely populated river basin.
    • Cultural Importance: Sacred in Indian culture; declared National River in 2008.
    • Economic Role: Central to agriculture, fisheries, and trade, contributing about 40% of India’s GDP.
    • Ecological Significance: Home to snow leopard, elephants, and Ganga dolphin; includes Corbett, Dudhwa, and Sundarbans reserves.
    • Conservation Efforts: Ganga Action Plan (1985) and Namami Gange Programme (2014); persistent issues of pollution, over-extraction, and climate change.
    [UPSC 2024] With reference to the Himalayan rivers joining the Ganga downstream of Prayagraj from West to East, which one of the following sequences is correct?

    Options: (a) Ghaghara – Gomati – Gandak – Kosi

    (b) Gomati – Ghaghara – Gandak – Kosi*

    (c) Ghaghara – Gomati – Kosi – Gandak

    (d) Gomati – Ghaghara – Kosi – Gandak

     

  • What are ‘Planetary Boundaries’?

    Why in the News?

    The Planetary Health Check (PHC) 2025 has warned that 7 of 9 planetary boundaries have now been breached.

    About Planetary Health Check (PHC):

    • The PHC is a global scientific assessment of Earth system health, tracking ecological thresholds that keep the planet habitable.
    • The 2025 report warns that 7 of 9 planetary boundaries have now been breached, with ocean acidification crossing the safe zone for the first time.
    • It highlights how human activities — fossil fuel combustion, deforestation, unsustainable agriculture, and industrial waste — are driving Earth beyond its safe operating space for the first time in 11,000 years.

    What are ‘Planetary Boundaries’?

    What are Planetary Boundaries?

    • Proposition: Coined in 2009 by scientists led by Johan Rockstrom.
    • What are they: Defines safe operating space for humanity by setting ecological thresholds that regulate Earth system stability and resilience.
    • Basis: Based on Holocene conditions (last ~11,000 years) that enabled human civilisation to thrive.
    • Significance: Crossing boundaries risks irreversible environmental collapse.

    • Nine Planetary Boundaries (PBs):

      1. Climate Change (CO₂ Concentration & Radiative Forcing): Safe atmospheric Carbon Dioxide (CO₂) level: 350 parts per million (ppm). Current: 423 ppm (2025); radiative forcing at +2.97 Watts per square meter (W/m²) (safe: +1.5 W/m²).
      2. Biosphere Integrity (Biodiversity Loss / Extinction Rate): Extinction rate at 100 extinctions per million species years (E/MSY) vs safe 10 E/MSY; severe biodiversity decline continues.
      3. Land System Change (Deforestation / Ecosystem Conversion): Global forest cover reduced to 59% (safe: 75%). All major terrestrial biomes breached.
      4. Freshwater Change (Streamflow & Soil Moisture Deviations): Over 20% of global land shows significant streamflow (22.6%) and soil moisture (22%) deviations beyond thresholds. Indo-Gangetic Plain & North China basins most at risk.
      5. Biogeochemical Flows (Nitrogen & Phosphorus Cycles): Excessive use of Nitrogen (N) and Phosphorus (P) in agriculture, worsening dead zones and eutrophication in water bodies.
      6. Novel Entities (Synthetic Pollutants & Plastics): Release of plastics, synthetic chemicals, and untested compounds exceeds the safe zero-threshold for environmental introduction.
      7. Ocean Acidification (Aragonite Saturation State): Surface ocean acidity has increased by 30–40% since the industrial era. Aragonite saturation state (Aragonite) at 2.84 (safe: 2.86). Threatens corals, molluscs, and plankton.
      8. Atmospheric Aerosol Loading (Aerosol Optical Depth – AOD) [Currently Safe]: Interhemispheric Aerosol Optical Depth (AOD) difference: 0.063, below safe threshold 0.10. Still harmful for health despite planetary stability.
      9. Stratospheric Ozone Depletion (Ozone Concentration in Dobson Units – DU) [Currently Safe]: Global ozone concentration stable at 285–286 Dobson Units (DU) (safe: 277 DU). Ozone hole recovery continues, though new threats flagged from rocket launches and satellite debris.
    [UPSC 2018] The term “sixth mass extinction/sixth extinction” is often mentioned in the news in the context of the discussion of:

    (a) Widespread monoculture practices in agriculture and large-scale commercial farming with indiscriminate use of chemicals.

    (b) Fears of a possible collision of a meteorite with the Earth.

    (c) Large scale cultivation of genetically modified crops.

    (d) Mankind’s over-exploitation/misuse of natural resources, fragmentation/loss of natural habitats, destruction of ecosystems, pollution and global climate change.

     

  • Corporate Average Fuel Efficiency (CAFE) Norms

    Why in the News?

    The Bureau of Energy Efficiency (BEE) under the Ministry of Power has issued draft CAFE-3 and CAFE-4 norms, applicable from April 2027 to March 2037.

    About Corporate Average Fuel Efficiency (CAFE) Norms:

    • What is it: Standards that mandate automakers to maintain a sales-weighted fleet average of fuel efficiency and CO₂ emissions across all passenger vehicles.
    • Origin:
      • First introduced in the United States in 1975 after the Arab Oil Embargo, aimed at lowering oil dependency.
      • In India, first notified in 2017 under the Energy Conservation Act, 2001, framed by the Bureau of Energy Efficiency (BEE), Ministry of Power.
    • Objective:
      • Reduce CO₂ emissions and oil imports, improve energy security.
      • Push adoption of EVs, hybrids, flex-fuels, and fuel-efficient technologies.
    • Applicability: Passenger vehicles (< 3,500 kg gross vehicle weight) across petrol, diesel, LPG, CNG, hybrid, and electric categories.
    • Phased Implementation in India:
      • CAFE I (2017–2022) → CO₂ emission limit of 130 g/km.
      • CAFE II (2022–2027) → stricter limit of 113 g/km.
      • CAFE III (Draft, 2027–2032) → 91.7 g/km CO₂ limit, aligned with WLTP (World Harmonised Light Vehicle Test Procedure).
      • CAFE IV (Draft, 2032–2037) → 70 g/km CO₂ limit (most stringent stage yet).
    • Recent Updates (Draft CAFE-3 & CAFE-4, Sept 2025):
      • Automakers allowed to form pools of up to 3 manufacturers.
      • Pooling treated as one fleet for compliance; pool manager bears penalty if limits breached.
      • A manufacturer can join only one pool per year but can switch in later years.
      • Special relief for small cars (under 4m, <909 kg, <1200 cc): eligible for up to 9 g/km CO₂ relief.
      • Incentives for flex-fuel vehicles (ethanol-petrol blends) and strong hybrids alongside EVs.
      • Aim: Balance decarbonisation with consumer affordability and revive the small car segment (which saw 71% sales decline in 6 years).
    • Compliance & Penalties:
      • Exceeding CO₂ limits: Regulatory fines under the Energy Conservation Act, 2001.
      • CAFE credits may be earned, traded, or carried forward to offset temporary lapses.
    • Green Impact:
      • Complements India’s Net Zero 2070 goals.
      • Encourages fuel-efficient models, biofuels, and EV adoption.

    How are CAFE Norms different from Bharat Stage (BS) Norms?

    CAFE Norms Bharat Stage (BS) Norms
    Full Form Corporate Average Fuel Efficiency Bharat Stage Emission Standards
    Primary Focus Fleet-wide fuel efficiency & CO₂ emissions Individual vehicle toxic exhaust pollutants (NOx, PM, CO, HC, SOx)
    Objective Reduce oil imports, improve energy efficiency, cut CO₂ Reduce air pollution & public health risks
    Regulating Authority BEE, Ministry of Power (Energy Conservation Act, 2001) MoEFCC & CPCB
    Scope Passenger vehicles (<3,500 kg GVW; petrol, diesel, LPG, CNG, hybrids, EVs) Mainly ICE vehicles; tailpipe pollutants from petrol & diesel
    Parameters Measured Fleet average CO₂ (g/km) Pollutants: NOx, CO, PM, HC, SOx
    Basis of Measurement Sales-weighted fleet average across all models Individual vehicle emissions tested
    Phases in India CAFE I (2017–22: 130 g/km) → CAFE II (2022–27: 113 g/km) → Draft CAFE III (2027–32: 91.7 g/km) → Draft CAFE IV (2032–37: 70 g/km) BS-I (2000) → BS-II (2005) → BS-III (2010) → BS-IV (2017) → BS-VI (2020; leapfrogged BS-V)
    Testing Standard Fuel efficiency & CO₂ per km (lab-tested, WLTP cycle for future) Pollutant emissions measured under regulated driving cycles
    Impact on Industry Forces OEMs to balance fleet mix (e.g., SUVs offset by EVs/hybrids) Forces OEMs to adopt clean fuel & emission-control tech (e.g., DPF, SCR)
    Penalties Heavy fines for fleet CO₂ non-compliance; penalties apply to pool manager in pooled fleets Non-compliant vehicles cannot be sold; penalties & recalls
    Global Parallel U.S. CAFE norms (1975) Euro emission standards

     

    [UPSC 2020] Which of the following are the reasons/factors for exposure to benzene pollution?

    1. Automobile exhaust 2. Tobacco smoke 3. Wood burning 4. Using varnished wooden furniture 5. Using products made of polyurethane

    Select the correct answer using the code given below:

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

     

  • New species of finless Snake Eel named after Kanniyakumari

    Why in the News?

    ICAR- National Bureau of Fish Genetic Resources (NBFGR) researchers in Kochi have discovered a new finless snake eel species, Apterichtus kanniyakumari, named after Kanniyakumari district.

    New species of finless Snake Eel named after Kanniyakumari

    About Finless Snake Eel (Apterichtus kanniyakumari):

    • Location: Discovered off the Colachel coast, Kanniyakumari (Tamil Nadu), at ~100 m depth during deep-sea trawling.
    • Etymology: Named kanniyakumari in honour of the district’s cultural, linguistic, historical, and geographical heritage.
    • Taxonomy: Belongs to the genus Apterichtus, family Ophichthidae, commonly known as finless snake eels.
    • Morphological traits: Golden-yellow body, pale white ventral head with yellow jaw lines, three black blotches (behind eyes, at rictus, behind rictus origin), conical uniserial teeth, 3 preopercular & 9 supratemporal pores.
    • Molecular confirmation: Mitochondrial CO1 gene analysis shows it as a distinct clade, closely related to Apterichtus nanjilnaduensis.
    • Significance: Marks the 16th new species described from the Indian coast by NBFGR; adds to India’s marine biodiversity records.
    [UPSC 2016] Recently, our scientists have discovered a new and distinct species of banana plant which attains a height of about 11 meters and has orange coloured fruit pulp. In which part of India has it been discovered?

    (a) Andaman Islands *

    (b) Anaimalai Forests

    (c) Maikala Hills

    (d) Tropical rain forests of northeast

     

  • [25th September 2025] The Hindu Op-ed: Follow the rains, not the calendar to fight floods

    PYQ Relevance

    [UPSC 2016] The frequency of urban floods due to high-intensity rainfall is increasing over the years. Discussing the reasons for urban floods, highlight the mechanisms for preparedness to reduce the risk during such events.

    Linkage: This PYQ is directly linked to the article as both focus on increasing urban floods due to high-intensity, untimely rainfall and the need for better preparedness. It is important for UPSC as it tests understanding of climate change impacts, urban governance, and disaster management, all of which the article highlights through outdated drainage design, rainfall compression, and the need to “follow the rains, not the calendar.

    Mentor’s Comment

    Urban floods are no longer seasonal accidents; they are recurring crises that expose the mismatch between traditional planning calendars and the realities of a changing climate. This article unpacks the failures of outdated urban flood management and suggests a roadmap for building resilient cities. Aspirants must note its direct relevance to GS 1 (urbanisation), GS 2 (governance), GS 3 (disaster management, environment), and GS 4 (ethics in governance).

    Introduction

    Every monsoon, India’s cities brace for floods with desilting of drains, deploying contractors, and activating emergency protocols. Yet, reality unfolds differently, roads submerge, homes flood, and transport grinds to a halt. The core problem lies not only in the intensity and unpredictability of rainfall but also in city systems designed for a climate that no longer exists. Urban resilience now demands shifting from “seasonal schedules” to real-time rainfall preparedness.

    Why in the News?

    This year, northern states like Punjab (all 23 districts), Delhi, and Gurugram witnessed severe floods in September, well beyond the traditional monsoon period. Uttarakhand and Himachal Pradesh saw frequent cloudbursts, while Kolkata faced torrential rains. Such untimely, intense, and regionally widespread flooding marks a sharp departure from past rainfall behaviour. With single floods now causing damages worth ₹8,700 crore, the urgency to rethink urban flood management cannot be overstated.

    Understanding Changing Rainfall Patterns

    1. Shift in Timing: Mumbai recorded 135.4 mm rainfall in May (normally a pre-monsoon month), followed by 161.9 mm the next day. Delhi saw 81 mm fall in a few hours, overwhelming drains.
    2. Rise in Frequency: CEEW analysis shows 64% of tehsils across states like Maharashtra, Tamil Nadu, Gujarat, and Karnataka have seen heavy rainfall days increase by 1–15 days.
    3. Compression of Rainfall: Rainfall that earlier spanned a day is now compressed into hours, intensifying floods.

    Why are Indian Cities Flooding so Frequently?

    1. Outdated Drainage Design: Systems still rely on seasonal averages rather than short-duration, high-intensity rain data.
    2. Unmanaged Waste: Plastic and debris block drains; even after desilting, poor waste collection leads to quick clogging.
    3. Poor Coordination: Storm water, sanitation, and municipal waste departments work in silos, creating gaps in preparedness.
    4. Static Planning: Drainage infrastructure often relies on rainfall data decades old, ignoring evolving IDF (Intensity-Duration-Frequency) curves.

    What Solutions are Proposed?

    1. Sub-daily Rainfall Analysis: Municipalities must adopt rainfall data in smaller time frames (1–3 hours) to plan drainage.
    2. Drainage-Waste Synchronisation: Waste collection and drain cleaning must be coordinated; rainfall alerts should trigger joint drives.
    3. Updating IDF Curves: Curves must be revised every 5–10 years; new drainage should factor in topography and micro-catchments.
    4. Infrastructure Upgradation: Example – BMC’s plan to widen drains to handle 120 mm/hour rainfall and prepare a new drainage master plan.
    5. Separate Sewerage and Stormwater Networks: To prevent overload and improve efficiency.

    Broader Implications for Urban Planning

    1. Disaster Management: Floods are now the leading cause of life and property loss among natural disasters in India.
    2. Economic Impact: Each major flood inflicts damages of nearly ₹8,700 crore.
    3. Climate Resilience: Cities must adapt to “rain already falling” instead of waiting for calendar-based monsoon onset.

    Conclusion

    India is not losing to rain, but to outdated assumptions about rain. The fight against urban floods requires breaking the illusion of a uniform monsoon season. By following the rain, not the calendar, cities can design adaptive infrastructure, improve inter-departmental coordination, and protect citizens’ lives and livelihoods.

    Value Addition

    Case Study: Vijayawada’s Monsoon Response Teams

    • Integrated approach: The city administration created special monsoon response teams that brought together officials from the sanitation, engineering, and planning departments to work in coordination during high-risk rainy periods.
    • Real-time action: Instead of relying on rigid seasonal schedules, these teams responded dynamically to rainfall alerts and forecasts, immediately conducting joint sanitation drives and drain inspections.
    • Drainage & waste sync: Garbage clearance and storm water drain cleaning were aligned, preventing freshly desilted drains from being blocked again by unmanaged waste.
    • Impact: This reduced waterlogging and urban flooding, improved road accessibility, and lessened health risks for residents during monsoons.
    • Learning: Vijayawada shows how inter-departmental coordination, proactive planning, and rainfall-triggered response systems can make cities more resilient to changing monsoon patterns.

    Global Context in Urban Flood Management

    Rotterdam, Netherlands – “Room for the River” approach

    • Idea: Instead of resisting water, the city creates water plazas that double as playgrounds during dry weather and hold excess rainwater during storms.
    • Infrastructure: Underground reservoirs, widened canals, and lowered floodplains to absorb water.
    • Learning: Shows the importance of adaptive urban design that accommodates rainfall variability.

    Copenhagen, Denmark – Cloudburst Management Plan

    • Trigger: After a massive cloudburst in 2011 caused $1 billion in damages.
    • Action: Developed over 300 projects including green roofs, permeable pavements, detention basins, and blue-green corridors that store and channel stormwater.
    • Learning: Proactive planning with a mix of nature-based and engineered solutions.

    New York City, USA – Green Infrastructure Plan

    • Focus: Reduce stormwater runoff that overwhelms combined sewer systems.
    • Measures: Rain gardens, bioswales, green roofs, permeable streets to capture rainfall locally.
    • Learning: Urban flooding is not just a drainage issue but requires land-use and design-based solutions.

    Singapore – ABC Waters Programme (Active, Beautiful, Clean)

    • Approach: Transforms canals, rivers, and drains into multifunctional spaces.
    • Measures: Retention ponds, vegetated swales, rain gardens integrated with urban landscapes.
    • Learning: Integrates aesthetics, ecology, and flood management, showing flood resilience can coexist with urban beauty.

    Tokyo, Japan – Underground Flood Tunnels (G-Cans Project)

    • Infrastructure: World’s largest underground floodwater diversion facility with 6.5 km tunnels and giant silos to store stormwater.
    • Impact: Protects Tokyo’s dense urban areas from typhoon rains and river overflow.
    • Learning: Mega-engineering projects can be effective in high-density megacities with extreme rainfall.

     

  • Pollution in Indian Rivers: CPCB Report, 2023

    Why in the News?

    The Central Pollution Control Board (CPCB) released its latest assessment (2022–23) on the health of Indian rivers.

    About Central Pollution Control Board (CPCB): 

    • Overview: Statutory body set up in September 1974 under the Water (Prevention and Control of Pollution) Act, 1974.
    • Expanded mandate: Later entrusted with powers under the Air (Prevention and Control of Pollution) Act, 1981.
    • Umbrella role: Serves as the technical arm of the Ministry of Environment, Forest & Climate Change (MoEFCC), implementing provisions of the Environment (Protection) Act, 1986.

    • Principal Functions:

      1. Water pollution control: Promote cleanliness of streams and wells across states by preventing, controlling, and abating pollution; Oversee the National Water Quality Monitoring Program to collect, collate, and disseminate data.
      2. Air pollution control: Improve air quality and control emissions; Run the National Air Monitoring Programme (NAMP) to determine current status and trends. Regulate industrial pollution, provide baseline data for industrial siting and town planning.
      3. Data Management: Collects, collates, and disseminates technical and statistical data on air and water pollution.

    • Key Initiatives and Programs:

      • NAMP: Monitors air quality and pollution trends.
      • NAQI (National Air Quality Index): Offers real-time air quality data.
      • GRAP (Graded Response Action Plan): Measures graded interventions based on severity of pollution.
      • Clean Air Campaign: Awareness and enforcement measures for pollution reduction.

    CPCB Assessment of Pollution in Indian Rivers:

    Parameters & Definitions:

    • Biological Oxygen Demand (BOD): It is the amount of dissolved oxygen needed by microbes to break down organic matter.
      • Healthy river: BOD <3 mg/L.
      • Unfit for bathing: BOD >3 mg/L.
    • Polluted River Stretch (PRS): When two or more consecutive locations in a river exceed bathing criteria (BOD >3 mg/L).
    • Priority Classification (BOD levels):
      1. Priority 1: >30 mg/L → Most polluted, urgent remediation.
      2. Priority 2: 20–30 mg/L.
      3. Priority 3: 10–20 mg/L.
      4. Priority 4: 6–10 mg/L.
      5. Priority 5: 3–6 mg/L → least polluted category but still polluted.

    Key Findings of the Report: 

    • Unfit bathing locations: 807 (2023) vs 815 (2022), shows marginal dip.
    • Polluted River Stretches (PRS): 296 stretches/locations across 271 rivers in 2023 vs 311 stretches in 279 rivers in 2022.
    • State-wise PRS (2023):
      1. Maharashtra: 54 (highest).
      2. Kerala: 31.
      3. Madhya Pradesh: 18.
      4. Manipur: 18.
      5. Karnataka: 14.
    • Most polluted states by Priority 1 (2023): Tamil Nadu, Uttar Pradesh, Uttarakhand (5 each).
    • Most polluted states by Priority 1 (2022): Gujarat and Uttar Pradesh (6 each).
    [UPSC 2017] Biological Oxygen Demand (BOD) is a standard criterion for:

    Options: (a) Measuring oxygen levels in blood

    (b) Computing oxygen levels in forest ecosystems

    (c) Pollution assay in aquatic ecosystems *

    (d) Assessing oxygen levels in high altitude regions