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GS Paper: GS3-18.Conservation, Environmental Pollution and Degradation, Environmental Impact Assessment.

  • Why are Killer Whales offering fresh prey to humans?

    Why in the News?

    A new study in the Journal of Comparative Psychology documents rare instances of Killer Whales (Orcinus orca) sharing freshly killed prey with humans.

    Why are Killer Whales offering fresh prey to humans?

    About Killer Whales (Orcinus orca):

    • Overview: Largest member of the dolphin family (Delphinidae), often called “wolves of the sea”.
    • Apex predators: At the top of the marine food chain.
    • Physical traits:
      • Black dorsal side, white underside, distinctive eye patch, saddle patch behind dorsal fin.
      • Can grow up to 9 m, weigh over 5,000 kg, and swim up to 54 km/hr.
    • Social structure: Live in pods led by a matriarch; highly coordinated hunters using complex tactics.
    • Distribution: Found in all oceans worldwide, from polar to tropical seas, in both open and coastal waters.
    • IUCN – Data Deficient: But many regional populations face threats from climate change, prey decline, and pollution.

    Why do they offer their fresh prey to humans?

    • Study Findings (2004–2024):
      • Killer whales were observed offering whole prey to humans (fish, birds, mammals, etc.) in multiple oceans.
      • In most cases, they waited for a human response before reclaiming or abandoning prey.
    • Possible Reasons:
      • Exploration/Curiosity: Reflects their advanced cognition and social curiosity; a way to learn about humans.
      • Prosocial Behaviour: They are among the few species that share food within and outside their groups.
      • Play Theory Rejected: Behaviour not limited to juveniles; adults also involved, often with whole prey.
      • Scientific Thinking Analogy: Behaviour resembles “asking questions” and testing human reactions — a form of exploratory intelligence.
      • Machiavellian Behaviour: Could sometimes be manipulative, as killer whales are known to steal fish and disrupt vessels.
    [UPSC 2023] Which one of the following makes a tool with a stick to scrape insects from a hole in a tree or a log of wood?

    Options: (a) Fishing cat (b) Orangutan * (c) Otter (d) Sloth bear

     

  • Fireflies emerge as Ecological Indicators

    Why in the News?

    A recent study in Tamil Nadu documented multiple firefly species and highlighted their role as ecological indicators of habitat health.

    About Fireflies and their behaviour traits:

    • Identity: Bioluminescent beetles (not true flies) of the family Lampyridae.
    • Life Cycle: Larvae live in soil/leaf litter feeding on snails and worms; adults emerge after rains and live briefly to reproduce.
    • Indian Species: Abscondita chinensis, Luciola ovalis, Luciola nicolleri, Asymmetricata humeralis, Pyrocoelia analis.
    • Distribution: Found in tropical and temperate regions; most visible on humid monsoon nights.
    • Bioluminescence: Glow produced in abdominal light organ using luciferin, luciferase, oxygen, and ATP.
    • Light Nature: Cold and efficient, colours vary between green and yellow depending on species.
    • Courtship Function: Flashing used as mating signal; males emit species-specific codes, females respond if correct.

    Ecological Role and Conservation Significance:

    • Sensitivity: Strongly affected by pesticides, habitat loss, artificial lights, and polluted water.
    • Habitat Health Indicator: Large synchronised gatherings reflect intact ecosystems; sparse numbers signal disturbance.
    • Light Pollution Impact: Artificial lighting disrupts flashing, forcing males to waste energy and reducing mating success.
    • Local Evidences: Communities like the Malasar and Irula report declines linked to pesticides and polluted streams.
    • Indicator Role: Act as proxy species for nocturnal biodiversity, signalling risks to moths, bats, and amphibians.
    [UPSC 2024] Which one of the following shows a unique relationship with an insect that has coevolved with it and that is the only insect that can pollinate this tree?

    Options: (a) Fig* (b) Mahua (c) Sandalwood (d) Silk cotton

     

  • Ice Age-era Dragon Fly rediscovered

    Why in the News?

    Odonatologists have reconfirmed the presence of the elusive dragonfly species Crocothemis erythraea in the southern Western Ghats.

    About Crocothemis erythraea Dragonfly:

    • Species Type: A rare dragonfly species, usually found in Europe, Asia, and the Himalayas.
    • Recent Finding: Reconfirmed in the Western Ghats, specifically in Kerala and Tamil Nadu high ranges.
    • Comparison: Closely resembles the common lowland species Crocothemis servilia, leading to earlier misidentifications.
    • Habitat Preference: Inhabits cooler, high-altitude areas above 550 metres.
    • Historical Origin: Likely spread to South India during the Ice Age and survived in montane habitats such as Sholas and grasslands.

    Significance of the Discovery:

    • Biodiversity Insight: Demonstrates how ancient climate changes influenced current biodiversity patterns.
    • Ecological Importance: Reinforces the Western Ghats’ status as a biodiversity hotspot of global value.
    • Conservation Message: Highlights the need to protect sensitive high-altitude habitats like Sholas and montane grasslands.
    • Scientific Contribution: Adds to India’s growing record of documenting and conserving rare species.
    [UPSC 2024] The organisms Cicada, Froghopper and Pond skater are:

    Options: (a) Birds (b) Fish (c) Insects* (d) Reptiles

     

  • United Nations Conference on Environment and Development (UNCED)

    Why in the News?

    This year marks three decades since the landmark Earth Summit in Rio de Janeiro in 1992, which established the United Nations Framework Convention on Climate Change (UNFCCC).

    About United Nations Conference on Environment and Development (UNCED):

    • Event: Also called the Earth Summit, held in Rio de Janeiro, Brazil (June 3–14, 1992).
    • Participation: 178 countries, 117 heads of state, thousands of NGOs and civil society groups.
    • Objective: Reconcile economic growth with environmental protection, mainstreaming sustainable development globally.
    • Key Outcomes:
      • Rio Declaration (27 principles, including precautionary principle & Common but Differentiated Responsibilities (CBDR)).
      • Agenda 21 (non-binding action plan for sustainable development).
      • UNFCCC (binding treaty on climate change; later Kyoto Protocol, Paris Agreement).
      • Convention on Biological Diversity (CBD) (binding treaty on biodiversity).
      • Statement of Forest Principles (non-binding guidelines for sustainable forests).
      • Commission on Sustainable Development (CSD) created to monitor implementation.
    • Significance: Landmark in international environmental diplomacy, embedding sustainability in global policy and leading to follow-ups (Rio+10, Rio+20).

    India and UNCED:

    • Stance & Advocacy:
      • Strongly pushed for Common but Differentiated Responsibilities (CBDR); developed nations must bear greater responsibility due to historical emissions and resource use.
      • Emphasized poverty eradication and the right to economic growth for developing countries.
      • Called for financial support and technology transfer from developed countries to the Global South.
    • Commitments:
      • Signed & ratified all key Rio agreements: Rio Declaration, Agenda 21, UNFCCC, CBD.
    • Domestic Follow-up:
      • Integrated Agenda 21 principles into national policies (sustainable resource use, biodiversity protection, EIAs).
      • Strengthened environmental legislation under the Environment Protection Act (1986).
    • Role: Positioned itself as a voice of developing countries, balancing environment with development imperatives.
    [UPSC 2010] The United Nations Framework Convention on Climate Change (UNFCCC) is an international treaty drawn at-

    Options:

    (a) United Conference on the Human Environment, Stockholm, 1972

    (b) UN Conference on Environment and Development, Rio De Janerio, 1992 *

    (c) World Summit on Sustainable Development, Johannesburg, 2002

    (d) UN Climate Change Conference, Copenhagen, 2009

     

  • Gangotri Glacier System (GGS) shrinks 10% in 4 decades

    Why in the News?

    A recent IIT Indore study shows that climate change has caused a 10% shrinkage in the Gangotri Glacier System over four decades, altering snowmelt and hydrology.

    Gangotri Glacier System (GGS) shrinks 10% in 4 decades

    About Gangotri Glacier System (GGS):

    • Location: Uttarkashi District, Uttarakhand, in the Central Garhwal Himalayas.
    • Origin: Near the Chaukhamba massif at ~7,000 metres above sea level.
    • Size: Main trunk 30–32 km long, 2–4 km wide, with a total glacierized area of ~252 sq. km.
    • Snout: Known as Gaumukh (“cow’s mouth”), source of the Bhagirathi River, which later merges with the Alaknanda at Devprayag to form the Ganga.
    • Tributaries: Includes Chaturangi, Raktavarn, Meru, Rudugaira, Kedar, and Vasuki glaciers.
    • Type: Valley-type glacier with granite, gneiss, and schist bedrock.
    • Features: Moraines, supraglacial lakes, crevasses, and avalanche fans.
    • Debris Cover: 20–24% of the glacier area is debris-covered, affecting melting rates.

    Key Findings of the IIT Indore Study (1980–2020):

    • Flow Contribution: Snowmelt 64%, glacier melt 21%, rainfall-runoff 11%, base flow 4%.
    • Decline in Snowmelt Share: From 73% in 1980–90 to 63% in 2010–20, reflecting climate change impact.
    • Temperature Rise: Mean annual temperature increased by 0.5°C in 2001–2020 compared to 1980–2000.
    • Shift in Peak Discharge: From August to July since the 1990s due to earlier melting and reduced winter precipitation.
    • Snowmelt Rebound: During 2010–2020, colder winters (–2°C) and higher winter precipitation (262 mm) increased snow accumulation.
    [UPSC 2019] Consider the following pairs:

    Glacier: River

    1. Bandarpunch -Yamuna

    2. Bara Shigri -Chenab

    3. Milam -Mandakini

    4. Siachen -Nubra

    5. Zemu -Manas

    Which of the pairs given above are correctly matched?

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

     

  • Nepal officially joins IBCA

    Why in the News?

    Nepal has officially joined the International Big Cat Alliance (IBCA), an India-led global initiative to protect seven species of big cats.

    About the International Big Cat Alliance (IBCA)

    • Overview: A global multi-country, multi-agency alliance of 95 countries (range and non-range) focused on conserving big cats and their habitats.
    • Launch: Proposed by PM Modi in 2019; officially launched in April 2023 on Project Tiger’s 50th anniversary.
    • Conservation Scope: Works to protect 7 species of big cats — tiger, lion, leopard, snow leopard, cheetah, jaguar, and puma.
    • Functions: Operates through advocacy, knowledge-sharing, eco-tourism promotion, and resource mobilisation.
    • Conflict Mitigation: Aims to reduce human–wildlife conflict and restore degraded habitats.
    • Institutional Structure:
      • Governance: Managed by a General Assembly, elected Council, and Secretariat headed by a Secretary-General.
      • Headquarters: Permanent base established in India following ratification of the HQ agreement.

    Global Participation

    • Membership: Includes 95 countries across Asia, Africa, the Americas, and Europe/Central Asia. Examples:
      • Asia: India, China, Nepal, Pakistan, Iran.
      • Africa: Kenya, Congo, Ghana.
      • Americas: Brazil, Ecuador, United States.
      • Europe/Central Asia: Russia, Kazakhstan.
    • Ratification: Bhutan, Eswatini, Cambodia, Guinea, India, Liberia, Nicaragua, Somalia, and Suriname have deposited ratification instruments.

    India’s Role:

    • Biodiversity Hub: India hosts 5 of the 7 big cats — tiger, lion, leopard, snow leopard, and cheetah — and holds 70% of global tiger population.
    • Funding: Government committed ₹150 crore for 2023–2028; mobilising international contributions.
    • Leadership: India sets global benchmarks in wildlife conservation and ecological stewardship, positioning itself as a leader in big cat protection.
    [UPSC 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 2

     

  • Haryana defines ‘Forest’: Controversy and Implications

    Why in the News?

    Haryana has notified the dictionary meaning of “forest” as per Supreme Court directions.

    Haryana defines ‘Forest’: Controversy and Implications

    Haryana’s definition of Forest:

    • Definition: A patch of land is deemed a forest if:
      • Minimum area: 5 hectares (isolated) or 2 hectares (contiguous with notified forest).
      • Minimum canopy density: 0.4 (40%) or more.
    • Exclusions: Linear/compact/agro-forestry plantations and orchards outside government-notified forests.
    • Aim: Create a uniform standard for identifying forests under the Forest (Conservation) Act, 1980 (FCA).

    Issues with Haryana’s Definition:

    • High thresholds:
      • 40% canopy cover excludes scrub forests and dry deciduous vegetation like the Aravallis.
      • 2–5 hectare size requirement too high for an arid state with fragmented green cover.
    • Exclusion of Aravallis: Sensitive ridge areas risk exposure to illegal mining, encroachment, and real estate development.
    • Contradiction with Godavarman judgment (1996): SC had ruled that “forest” must be understood in its dictionary meaning, regardless of size, ownership, or canopy density.
    • Dilution of protection under FCA 1980: Narrows the scope of land eligible for forest safeguards.

    Godavarman Case & FCA Background:

    • Forest (Conservation) Act, 1980: Restricted dereservation/diversion of forest land without Centre’s approval.
    • T N Godavarman v Union of India (1996): Court ruled “forest” must be understood in its dictionary meaning, covering all forested lands regardless of ownership or official status.
    • 2023 FCA Amendment: Limited scope to notified forests and recorded forest lands.
      • Amendment challenged by retired IFS officers and NGOs for diluting FCA protections.
    • SC in February 2024 directed States/UTs to continue using Godavarman definition while case is ongoing.

     

    [UPSC 2005] The minimum land area recommended for forest cover to maintain proper ecological balance in India is

    Options: (a) 0.25 (b) 0.33* (c) 0.43 (d) 0.53

     

  • NTCA limits definition of Tiger Corridors

    Why in the News?

    The National Tiger Conservation Authority (NTCA) recently issued a clarification limiting tiger corridors primarily to 32 “least cost pathways” identified in 2014.

    About National Tiger Conservation Authority (NTCA):

    • Statutory body: Under Ministry of Environment, Forest and Climate Change (MoEFCC).
    • Establishment: Created in 2006 under the Wildlife Protection Act, 1972.
    • Functions: Provides legal backing to Project Tiger, ensures Centre–State accountability via MoUs, and enables Parliamentary oversight.
    • Community Role: Addresses livelihood concerns of people around tiger reserves.
    • Composition: Chaired by MoEFCC Minister, Vice-Chairperson MoS, 3 Members of Parliament, MoEFCC Secretary, and others.

    What are Tiger Corridors?

    • Definition: Landscape linkages between tiger habitats that allow safe passage, genetic flow, and survival.
    • Need: Prevent isolation of tiger populations and human–tiger conflicts.
    • Examples of Macro-Corridors:
      • Shivalik–Gangetic Plains: Corbett–Dudhwa, Dudhwa–Kishanpur–Katerniaghat.
      • Central India & Eastern Ghats: Ranthambhore–Kuno–Madhav, Kanha–Pench, Bandhavgarh–Achanakmar.
      • Western Ghats: Sahyadri–Konkan–Radhanagari–Goa–Karnataka.
      • Northeast & Brahmaputra: Kaziranga–Karbi Anglong, Manas–Buxa.
      • Sundarbans Landscape.

    NTCA’s Policy Reversal:

    • July 25 Affidavit: Said corridor identification must use multiple data sources – protected areas, 2014 NTCA pathways, Tiger Conservation Plans (TCPs), Wildlife Institute of India (WII) studies (2016, 2021), and All-India Tiger Estimation (AITE) data.
    • August 21 Clarification: Limited definition only to 2014 least-cost pathways (32 corridors) and TCP corridors.
    • Exclusions: WII studies and AITE data dropped, despite 2014 report itself warning that listed corridors were “minimal requirement.”
    [UPSC 2020] Among the following Tiger Reserves, which one has the largest area under “Critical Tiger Habitat”?

    Options: (a) Corbett (b) Ranthambore (c) Nagarjunsagar-Srisailam* (d) Sunderbans

     

  • [20th August 2025] The Hindu Op-ed: Making India’s climate taxonomy framework work

    PYQ Relevance

    [UPSC 2022] Discuss global warming and mention its effects on the global climate. Explain the control measures to bring down the level of greenhouse gases which cause global warming, in the light of the Kyoto Protocol, 1997.

    Linkage: If such a theme on international climate governance and mechanisms can be asked, then India’s Climate Finance Taxonomy also becomes a significant area. It connects global agreements like the Paris Agreement (Article 6.4) with India’s domestic instruments such as the Carbon Credit Trading Scheme and green bonds.

    Mentors Comment

    In May 2025, the Ministry of Finance released the draft Climate Finance Taxonomy, India’s first attempt to formally define what counts as climate-aligned investment. The framework seeks to mobilise green finance, prevent greenwashing, and give clarity to investors. Its success, however, depends on strong review systems, accountability, and stakeholder engagement.

    Introduction

    The draft taxonomy marks a turning point in India’s climate governance. This is India’s first unified framework for climate finance, introduced amid rising greenwashing risks and investor uncertainty. Arriving alongside the operationalisation of the Carbon Credit Trading Scheme and the rise of green bonds, it comes at a moment of growing pressure to align finance with net-zero goals. As a “living framework,” it promises adaptability to evolving national and global priorities. But without transparency, legal coherence, and institutional accountability, the taxonomy risks undermining India’s climate finance ecosystem instead of strengthening it.

    The Review Architecture for a Living Framework

    1. Two-tier review system: Suggestion of annual reviews for short-term corrections and five-year reviews for deep reassessment.
    2. Annual reviews: Triggered by implementation gaps, international obligations, or stakeholder feedback, with structured timelines, documentation protocols, and public consultation.
    3. Five-year reviews: Linked with India’s NDC cycle and global stocktake under the UNFCCC; ensures long-term resilience in a changing climate finance ecosystem.

    Key aspects of the Substantive Review

    1. Legal coherence: Taxonomy must align with Energy Conservation Act, SEBI norms, Carbon Credit Trading Scheme, and India’s international commitments.
    2. Harmonisation: Review should remove overlaps, clarify redundancies, and integrate with green bonds, blended finance, and environmental risk disclosures.
    3. Content clarity: Definitions must remain readable, coherent, and technically precise. Quantitative thresholds (e.g., emissions reduction, energy efficiency benchmarks) must be regularly updated with empirical data.
    4. Inclusivity: Framework must remain accessible to MSMEs, informal sector, agriculture, and small manufacturing with staggered compliance timelines and proportionate expectations.

    Strengthening Governance through Accountability Structures

    1. Standing unit in the Ministry of Finance: Dedicated body within the Department of Economic Affairs or an expert committee involving financial regulators, climate science institutions, civil society.
    2. Public dashboards: Mechanisms to receive inputs, document experiences, and publish reports.
    3. Transparency: Annual review summaries and five-year revision proposals should be made public in consolidated formats to enhance investor trust and policy coherence.

    Significance of the Climate Finance Taxonomy for India’s Green Transition

    1. Carbon Credit Trading Scheme: Soon to be fully operational, requiring clear rules for market credibility.
    2. Green bonds: Entering mainstream portfolios and stock exchanges, need alignment with taxonomy standards.
    3. Public investment flows: Rising pressure to align fiscal spending with long-term climate goals.
    4. Risk of failure: A weak or opaque taxonomy could undermine India’s net-zero transition by encouraging greenwashing and eroding investor trust.

    Conclusion

    India’s climate taxonomy is more than a definitional exercise, it is a governance tool that can determine the credibility of India’s climate finance system. A “living document” is meaningful only if it is kept alive through active review, structured revision, and transparent engagement. By embedding legal coherence, inclusivity, and accountability, India can ensure the taxonomy becomes a reliable foundation for mobilising investments, reducing greenwashing, and achieving its climate goals.

    Value Addition
    • Article 6.4 of the Paris Agreement: Provides a framework for carbon market instruments with legal and editorial review mechanisms; offers a model for India’s taxonomy to ensure transparency, credibility, and alignment with global norms.
    • Carbon Market Types:
      • Compliance Markets: Mandated by law (e.g., EU ETS, upcoming India’s Carbon Credit Trading Scheme).
      • Voluntary Markets: Corporate/individual offsetting of emissions beyond legal requirements.
    • Green Bonds in India:
      • First Sovereign Green Bonds issued in 2023 worth ₹16,000 crore.
      • Used for renewable energy, clean transport, and climate adaptation projects.
      • Support India’s target of net-zero by 2070 and deepen climate finance flows.

    Mapping Microthemes

    • GS Paper II: Governance, public consultation, accountability mechanisms.
    • GS Paper III: Climate finance, carbon markets, sustainable development, green bonds, energy efficiency.
    • GS Paper IV: Ethical finance, transparency, preventing greenwashing.

  • Saltwater Crocodile Population Survey in Sundarbans

    Why in the News?

    A 2025 survey by the West Bengal Forest Department shows an increase in saltwater crocodile population in the Sundarbans Biosphere Reserve (SBR).

    Saltwater Crocodile Population Survey in Sundarbans

    About Saltwater Crocodile (Crocodylus porosus):

    • Largest living reptile and the largest of all crocodilians.
    • Males grow much larger than females; females usually 2.5–3 m in length.
    • Habitat: mangrove forests, swamps, rivers, and coastal waters; tolerant of varying salinity.
    • Distribution in India: Odisha, West Bengal (Sundarbans), Andaman & Nicobar Islands.
    • Behaviour: Apex predator, feeds on carcasses and diverse prey; communicates through barks, hisses, growls, chirps.
    • Conservation Status:
      • IUCN Red List: Least Concern.
      • CITES: Appendix I (except populations of Australia, Indonesia, PNG → Appendix II).
      • Wildlife Protection Act (1972): Schedule I.
    • Conservation Efforts: Bhagabatpur Crocodile Project (1976, West Bengal) – breeding and conservation programme; 577 crocodiles released till 2022.

    Other Crocodile Species in India:

    • Gharial: Critically Endangered; survives in only 2% of former range; Found in small stretches of Chambal and a few other rivers.
    • Mugger/Marsh Crocodile: Vulnerable; found in freshwater lakes, rivers, marshes.