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Subject: Environment

  • India’s first open-access ecoacoustic biodiversity dataset

    Why in the News

    Researchers have released India’s first open-access, crowdsourced ecoacoustic biodiversity dataset, capturing 518 species across 5,815 minutes of recordings from 25 states and union territories.

    What is ecoacoustics?

    1. Ecoacoustics is the study of sounds produced by organisms and the surrounding environment to understand ecosystems, biodiversity and ecological change.
    2. Instead of relying only on visual surveys, passive acoustic recorders can continuously capture:
      • Bird calls, Insect sounds, Frog and bat calls, Reptile and mammal vocalisations, Marine animal sounds, Background environmental sounds such as rain, wind and human activity

    Why does it matter?

    1. Non-invasive monitoring: Sound-based surveys track biodiversity cheaply and continuously across large areas.
    2. Open science: An open-access, crowdsourced dataset lets any researcher reuse the data for conservation.
    3. Baseline data: It creates a reference against which future biodiversity loss can be measured.

    [2023] Which of the following organisms perform waggle dance for others of their kin to indicate the direction and the distance to a source of their food?

    [A] Butterflies

    [B] )Dragonflies

    [C] Honeybees

    [D] Wasps

  • BNHS launches India’s first invasive-fish removal programme

    Why in the News

    The Bombay Natural History Society (BNHS) has launched India’s first community-driven removal programme for the invasive suckermouth catfish in Ujani Reservoir, Maharashtra.

    Suckermouth Catfish: Key Facts

    • Origin: Amazon River basin, South America.
    • Entry into India: Introduced through the aquarium trade and later released into natural waterways.
    • Local name: “Helicopter fish”.
    • Why invasive?
      • Feeds on fish eggs.
      • Competes with native bottom-feeding fish.
      • Burrows into riverbanks and can weaken earthen structures.
      • Adapts to adverse conditions.

    Scale of the Invasion

    • Around 97% of fish in Ujani are alien species including suckermouth catfish, Tilapia and African catfish.
    • Native fish account for only 3%.
    • Suckermouth catfish alone constitute around 30 to 40% of the total fish population.

    Impact on Fishermen

    • Around 20,000 people including fishermen, traders, transporters and labourers depend on the reservoir.
    • Invasive fish damage fishing nets and reduce the catch of economically valuable Rohu, Catla and Mrigal.
    • Fishermen may need to replace nets every 15 to 20 days, adding to costs.

    BNHS Removal Model

    • Collection centre established at Bhigwan fish market.
    • Fishermen receive financial incentives for collecting the invasive fish.
    • 36+ tonnes have already been removed.
    • Fish is processed into molasses used as fertiliser.
    • Creates a removal + livelihood + waste-utilisation model.

    “[2023] Invasive Species Specialist Group (that develops Global Invasive Species Database) belongs to which one of the following organizations?

    (a) The International Union for Conservation of Nature

    (b) The United Nations Environment Programme

    (c) The United Nations World Commission for Environment and Development

    (d) The World Wide Fund for Nature.

  • India’s Lepidoptera Diversity

    Why in the News?

    The Zoological Survey of India (ZSI) has published the Catalogue of Lepidoptera (Butterflies & Moths) of India in the peer-reviewed journal Zootaxa. The catalogue, prepared over nearly 12 years, provides an updated national inventory of India’s butterfly and moth diversity.

    Key Findings

    • India has 13,703 species of Lepidoptera.
    • This represents about 8.25% of the world’s known Lepidoptera.
    • Butterflies: 1,417 species
    • Moths: 12,286 species
    • These are distributed across: 3,705 genera, 240 subfamilies, 102 families, 31 superfamilies

    Geometroidea

    • 2,205 species of Geometroidea have been catalogued in India.
    • They belong to: 479 genera, 13 subfamilies, and 4 families
    • They constitute around 8.8% of the world’s known Geometroidea.
    • Many are nocturnal pollinators, complementing daytime pollinators such as butterflies.
    • Note: Geometridae is a very large family of slender-bodied, broad-winged moths.

  • Phoenix Species Project

    Why in the News

    The Phoenix Species Project, led by Re:wild and the Bezos Earth Fund with the IUCN Species Survival Commission, has launched a $200 million global initiative to recover 100 of the world’s most threatened species.

    What is the Phoenix Species Project?

    • Target: 100 species classified as Critically Endangered (CR) or Extinct in the Wild (EW) on the IUCN Red List.
    • Geographical spread: 30 countries.
    • Species covered: Mammals, birds, reptiles, amphibians, fish, invertebrates and plants.
    • Funding: $200 million
      • $100 million from Bezos Earth Fund
      • $100 million from Re:wild and supporting foundations.
    • Approach: Long-term, locally led species recovery rather than short-term conservation grants.

    Important species under the project

    • Bowmouth guitarfish: Threatened by the shark-fin trade; found in shallow waters from South Africa to Japan and Australia.
    • Hickory Nut Gorge green salamander: Restricted to a small canyon in North Carolina.
    • Charco Azul pupfish: Extinct in the wild; freshwater habitat was lost due to drought and water extraction.
    • Night parrot: Rare, nocturnal ground-dwelling bird of Australia’s arid regions.

  • Oil companies reject contamination claims against E20 petrol

    Why in the News

    Oil marketing companies rejected contamination allegations against E20 petrol after pan India testing, highlighting concerns over fuel quality, engine compatibility and consumer confidence.

    What is the Ethanol Blending Programme?

    • Objective: Reduce crude oil import dependence, improve energy security and support farmers.
    • E20: Petrol containing 20% ethanol.
    • India achieved the E20 blending target ahead of its earlier 2030 deadline.
    • Key Feedstocks: Sugarcane and molasses. Maize, and Surplus rice and other approved agricultural feedstocks

    Technical Trade-offs

    • Lower energy density: May reduce fuel economy.
    • Engine compatibility: Older vehicles may require compatible components.
    • Higher octane: Ethanol has a high octane rating and can improve combustion characteristics.

    “[2020] According to India’s National Policy on Biofuels, which of the following can be used as raw materials for the production of biofuels?
    1. Cassava
    2. Damaged wheat grains
    3. Groundnut seeds
    4. Horse gram
    5. Rotten potatoes
    6. Sugar beet
    Select the correct answer using the code given below:
    (a) 1, 2, 5 and 6 only
    (b) 1, 3, 4 and 6 only
    (c) 2, 3, 4 and 5 only
    (d) 1, 2, 3, 4, 5 and 6

  • Ethanol policy must count in water, sustainability costs

    Why in the News

    India has achieved nearly 20% ethanol blending (E20) in petrol by 2025, making it one of the world’s largest biofuel programmes. As the blending target is achieved, attention is shifting from quantity to the programme’s water use, life cycle emissions and energy efficiency.

    What is the E20 Ethanol Blending Programme?

    1. Definition: E20 is petrol blended with 20% ethanol.
    2. Progress: Ethanol blending increased from about 1.5% in 2013-14 to nearly 20% in 2025, with annual consumption of around 700 crore litres.
    3. Benefits: Reduces crude oil imports, boosts farmers’ income and strengthens energy security. Ethanol is often described as a low-carbon fuel because sugarcane absorbs atmospheric carbon dioxide during growth.

    What is Energy Return on Energy Invested (EROEI)?

    1. Definition: EROEI measures the usable energy obtained from a fuel relative to the energy spent producing it.
    2. Sugarcane Ethanol: EROEI of about 2 to 4 due to efficient bagasse based distilleries.
    3. Grain Ethanol: EROEI ranges from 1.2 to 2 because of higher fossil fuel inputs.
    4. Significance: Higher EROEI indicates a more energy efficient fuel.

    Why is water the biggest concern?

    1. High Water Demand: Estimates by the Commission for Agricultural Costs and Prices and NITI Aayog suggest that sugarcane requires 1,500 to 2,500 mm of water during cultivation.
    2. Large Water Footprint: Producing one litre of sugarcane ethanol may consume 2,000 to 3,500 litres of water.
    3. Groundwater Stress: Major sugarcane growing states already face groundwater depletion.
    4. Resource Trade-off: Excessive ethanol production may replace oil dependence with freshwater dependence.
    5. Distorting Subsidies: Subsidised electricity and fertilisers encourage over extraction of groundwater and excessive fertiliser use. Subsidised urea promotes overuse of nitrogen fertilisers.

    What are the other challenges?

    1. Lower Energy Density: Ethanol contains about 21 MJ/litre, compared to 32 MJ/litre for petrol, reducing fuel efficiency by about 6 to 7% under E20 blends. However, ethanol has a much higher octane rating, allowing engines specifically calibrated for higher ethanol blends to achieve more efficient combustion and partially offset this disadvantage. The overall outcome depends on engine design rather than fuel properties alone.
    2. Life Cycle Emissions: Sugarcane ethanol can reduce emissions by 50 to 70%, while grain ethanol offers 20 to 50% reduction, depending on production methods.
    3. Vehicle Compatibility: E20 can corrode certain engine components in older vehicles. Vehicles manufactured from April 2023 onwards are required to be E20 compatible.

    Conclusion

    India’s ethanol programme represents an important step towards greater energy security, but its long-term success will depend on aligning environmental objectives with sound economics. A resilient biofuel strategy must be guided by transparent life-cycle carbon accounting, rigorous assessment of water use, technology-neutral incentives and market signals that reflect the true value of natural resources.

    PYQ Relevance

    [2020] According to India’s National Policy on Biofuels, which of the following can be used as raw materials for the production of biofuels?
    1. Cassava

    2. Damaged wheat grains

    3. Groundnut seeds

    4. Horse gram

    5. Rotten potatoes

    6. Sugar beet
    Select the correct answer using the code given below:
    (a) 1, 2, 5 and 6 only (b) 1, 3, 4 and 6 only (c) 2, 3, 4 and 5 only (d) 1, 2, 3, 4, 5 and 6

  • SC order on mining around Ramsar wetland sites

    Why in the News

    The Supreme Court has clarified that its earlier direction restricting mining within a 10 km radius of the Asan Wetland Conservation Reserve now applies to all Wetland Conservation Reserves across India. Mining in such areas will require prior approval from the competent authority.

    What did the Supreme Court clarify?

    • Nationwide Application: The 10 km mining safeguard around the Asan Wetland Conservation Reserve will now apply to all Wetland Conservation Reserves.
    • Uniform Principle: The Court held that the protection should apply uniformly across the country.
    • Case Background: The clarification came while hearing an application filed by the Himachal Pradesh Government.
    • State’s Argument: Himachal Pradesh contended that Wetland Conservation Reserves do not have a statutory buffer zone unlike national parks.
    • Further Direction: The Court asked the National Board for Wildlife (NBWL) or the Ministry of Environment, Forest and Climate Change (MoEFCC) to examine whether the Asan Wetland extends into Himachal Pradesh.

    What is the Asan Wetland Conservation Reserve?

    • Location: Situated at the confluence of the Asan and Yamuna rivers in Uttarakhand.
    • Ramsar Status: Declared a Ramsar Site in 2020.
    • Ecological Importance: Supports migratory waterbirds and rich aquatic biodiversity.
    • Judicial Protection: Mining within a 10 km radius requires prior clearance from the NBWL or MoEFCC.

    What are Ramsar Sites?

    • Definition: Wetlands designated under the Ramsar Convention on Wetlands (1971) for their international ecological importance.
    • India’s Membership: India became a party to the Convention in 1982.
    • Current Status: India has 101 Ramsar Sites, the highest in Asia.
    • Significance: Ramsar designation commits countries to maintain the ecological character of wetlands but does not itself create a separate statutory protection regime.

    What is the legal position on mining near wetlands?

    • No Statutory Buffer: The Ramsar Convention and the Wetlands (Conservation and Management) Rules, 2017 do not prescribe a fixed buffer zone around wetlands.
    • 2010 Rules: Earlier rules listed prohibited activities and required prior approval for activities within the wetland’s zone of influence.
    • 2017 Rules: Replaced the earlier framework with a decentralised system led by State Wetland Authorities.
    • Judicial Safeguard: The Supreme Court’s ruling fills this regulatory gap by requiring prior clearance for mining near Wetland Conservation Reserves.

    [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?
    (a) Only one pair

    (b) Only two pairs

    (c) Only three pairs

    (d) All four pairs

  • Glaw Lake becomes Arunachal Pradesh’s first Ramsar site

    Why in the News

    Glaw Lake has been designated as Arunachal Pradesh’s first Ramsar Site, making it the state’s first Wetland of International Importance under the Ramsar Convention.

    What is the Ramsar Convention?

    • International treaty: An intergovernmental treaty for the conservation and wise use of wetlands.
    • Adopted: 2 February 1971 at Ramsar, Iran.
    • Came into force: 1975.
    • Objective: Promote the conservation and sustainable use of wetlands through national action and international cooperation.
    • India: A Contracting Party to the Convention.

    What is a Ramsar Site?

    • A wetland designated under the Ramsar Convention for its international ecological importance.
    • Selected based on criteria such as:
      • Unique wetland ecosystems.
      • Biodiversity significance.
      • Habitat for threatened species.
      • Importance for migratory waterbirds.

    Why is Glaw Lake Significant?

    • Location: Arunachal Pradesh.
    • First Ramsar Site: It is the first Wetland of International Importance from the state.
    • Recognition: Enhances conservation of the Eastern Himalayan wetland ecosystem.
    • Implementation: Designated under the Ramsar Convention with the involvement of the Ministry of Environment, Forest and Climate Change (MoEFCC) and the Wetlands Division.

    [2019] With reference to Wetlands, consider the following statements:
    1. Under Ramsar Convention, it is mandatory on the part of the Government of India to protect and conserve all the wetlands in the territory of India.
    2. They are covered with hydric soils.
    3. Wetlands are often referred to as Kidneys of the Earth.
    Which of the statements given above is/are correct?

    [A] 1 and 2 only

    [B] 2 and 3 only

    [C] 1 and 3 only

    [D] 1, 2 and 3

  • Why floods in Kerala are becoming more severe

    Why in the News

    Recurrent severe flooding in Kerala is traced to how the land and rivers have been altered, not rainfall alone. The tension is between treating floods as a natural disaster and recognising them as a man made outcome.

    What is driving the flood intensity?

    1. River siltation: Sediment build up reduces the carrying capacity of rivers.
    2. Dam storage loss: The extremely heavy rains have increased the water level in all dams, run by both the state electricity board and the irrigation department. A Comptroller and Auditor General (CAG) audit found major storage loss at reservoirs due to sedimentation, including 47% at Kallarkutty.
    3. Wetland shrinkage: Paddy and wetland area fell from 7.93 lakh hectares in 1979 to 1980 to 1.80 lakh in 2023 to 2024.
    4. Concretisation: Hard surfaces from urbanisation alter natural drainage. During heavy rains, these impervious surfaces channel stormwater rapidly into nearby rivers and streams, causing water levels to rise within hours.

    Why do these factors worsen floods?

    1. Reduced buffer: Lost wetlands and paddy no longer absorb excess water. Paddy fields, marshlands and wetlands, are known for absorbing a huge volume of rainfall
    2. Faster runoff: Concrete surfaces speed runoff into swollen rivers.
    3. Lower channel capacity: Silted rivers overflow at lower volumes.

    What is the state’s response?

    1. Desilting: The government plans desilting of rivers and reservoirs.
    2. Asset register: An asset register will be prepared for rivers, streams and lakes and land auditing is proposed to prevent encroachment of rivers
    3. Land use: Restoration of paddy and wetland is under consideration.

    Conclusion

    Kerala’s floods are the product of altered hydrology as much as heavy rain. The unresolved task is reversing decades of wetland loss and unplanned construction.

    Back2Basics

    Manufactured sand

    Manufactured sand, or M-sand, is an artificial fine aggregate made by crushing hard rocks like granite, basalt, or gneiss into small, sharp grains. It serves as a strong, eco-friendly replacement for natural river sand in modern construction.

    How It Is Made

    1. Quarrying and Blasting: Hard rock is pulled out from quarries.
    2. Primary and Secondary Crushing: Large rocks go through jaw or cone crushers to break down into smaller pieces.
    3. Shaping and Sizing: Vertical Shaft Impact (VSI) crushers smash and shape the particles into angular, cubical forms.
    4. Screening and Washing: Sieves sort the grain sizes, and water washes away excess rock dust and micro-fines.

    Benefits of Manufactured Sand

    1. No Impurities: Free of clay, silt, and organic trash found in riverbeds.
    2. High Strength: Sharp, angular edges interlock tightly, giving concrete better bonding and compression strength.
    3. Eco-Friendly: Stops harmful river dredging that ruins water life and river banks.
    4. Consistent Quality: Made in factories with strict size controls instead of relying on nature.

    PYQ Relevance

    [UPSC 2024] Flooding in urban areas is an emerging climate-induced disaster. Discuss the causes of this disaster. Mention the features of two such major floods in the last two decades in India. Describe the policies and frameworks in India that aim at tackling such floods.

    Linkage: The PYQ examines the causes of urban flooding and India’s policy response to flood disasters. Kerala shows how wetland loss, river siltation, concretisation and altered land use intensify floods despite heavy rainfall, highlighting the need for ecosystem-based flood management.

  • The road ahead for the Asiatic lion as its range spreads

    Why in the News

    The Asiatic lion population has recovered strongly but is increasingly living outside protected areas. The tension is between a conservation success in numbers and the rising conflict and risk that dispersal brings.

    What is the Asiatic lion?

    1. Endemic species: The Asiatic lion (Panthera leo persica) survives only in and around the Gir landscape of Gujarat.
    2. Status change: The International Union for Conservation of Nature (IUCN) moved it from Critically Endangered to Endangered.
    3. Single population: The entire wild population is concentrated in one region, making it vulnerable to a single event.

    How has the population and range changed?

    1. Recovery: Numbers grew from about 100 to 150 six decades ago to over 1,000 today.
    2. Dispersal: Nearly half the lions now live outside protected areas.
    3. Satellite groups: For the first time, data shows that more than half—497 lions—now live outside the core Gir protected areas in nine distinct satellite populations spread across 11 districts, spanning a territory of 35,000 square kilometers.

    Why does the spread create new risks?

    1. Habitat threat: A proposed limestone mine in the Babarkot corridor threatens a dispersal route.
    2. Disease risk: Past outbreaks of Canine Distemper Virus and babesiosis killed many lions.
    3. Green Status: The species remains assessed as “largely depleted” despite the numeric recovery.

    Back2Basics: Asiatic Lion (Gir)

    1. IUCN status: Endangered.
    2. Legal protection: Listed in Schedule I of the Wild Life (Protection) Act, 1972.
    3. Habitat: Gir National Park and Wildlife Sanctuary and surrounding landscape in Gujarat.
    4. Significance: Gir is the only natural home of the wild Asiatic lion.

    “[2024] Consider the following statements:
    1. Lions do not have a particular breeding season.
    2. Unlike most other big cats, cheetahs do not roar.
    3. Unlike male lions, male leopards do not proclaim their territory by scent marking.
    Which of the statements given above are correct?
    (a) 1 and 2 only
    (b) 2 and 3 only
    (c) 1 and 3 only
    (d) 1, 2 and 3