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Subject: Environment

  • What are Green Crackers?

    Why in the News?

    The Supreme Court of India has temporarily permitted the sale and bursting of green crackers in the Delhi–NCR region from October 18 to 21 for Diwali celebrations.

    Background and Judicial Origin:

    • Trigger: Severe air pollution episodes during Diwali (2016–2017) pushed Delhi’s Air Quality Index (AQI) beyond 500, creating a public-health emergency.
    • Supreme Court Intervention (2018):
      • Affirmed that cultural freedom cannot override the Fundamental Right to Life (Article 21).
      • Banned conventional firecrackers containing heavy metals such as barium, lead, and mercury.
      • Directed CSIR to develop less-polluting alternatives, with PESO (Petroleum and Explosives Safety Organisation) tasked to test and certify them.
    • Outcome: Introduction of green crackers as a compromise solution balancing festive traditions with public-health protection.
    • Legal Oversight: The Supreme Court continues to monitor compliance, permitting use only within fixed time windows and under strict emission-control standards.

    About Green Crackers:

    • Overview: Green crackers are eco-friendly fireworks developed by the Council of Scientific and Industrial Research – National Environmental Engineering Research Institute (CSIR-NEERI) to curb air pollution during festive celebrations.
    • Chemical Composition: Manufactured using modified formulations that exclude barium nitrate and significantly reduce sulphur and aluminium content, thereby cutting toxic emissions.
    • Emission Reduction: These crackers emit about 30 % less particulate matter (PM₂.₅ and PM₁₀) and 10 % less sulphur dioxide (SO₂) and nitrogen oxides (NO₂) than conventional firecrackers.
    • Identification & Legality: Each authorised packet carries the Green Fireworks logo and a QR code verifiable through the CSIR-NEERI Green QR Code App; crackers without codes are illegal.
    • Purpose: Designed to retain the cultural and festive appeal of fireworks while mitigating health and environmental impacts in pollution-prone regions such as Delhi-NCR.

    Types of Green Crackers:

    1. SWAS (Safe Water Releasable): Releases water vapour during combustion to reduce dust and temperature, lowering particulate emissions.
    2. STAR (Safe Thermite Cracker): Uses thermite-based reactions instead of conventional oxidisers, producing bright light and sound with reduced toxic output.
    3. SAFAL (Safe Minimal Aluminium): Limits metallic fuel content, maintaining luminosity and sound intensity while reducing aluminium and sulphur emissions.

    All three maintain sound levels around 100–120 dB, comparable to traditional fireworks but with a cleaner emission profile and shorter atmospheric residence time.

    [UPSC 2024] What is the common characteristic of the chemical substances generally known as CL-20, HMX and LLM-105, which are sometimes talked about in media?

    (a) These are alternatives to hydro- fluorocarbon refrigerants

    (b) These are explosives in military weapons *

    (c) These are high-energy fuels for cruise missiles

    (d) These are propulsion fuels for rocket

     

  • Rising carbon dioxide levels

    Introduction

    The atmospheric concentration of carbon dioxide (CO₂), the most significant greenhouse gas responsible for climate change, has increased by a record amount between 2023 and 2024, according to the World Meteorological Organization (WMO). The global average CO₂ concentration reached 423.9 parts per million (ppm) in 2024, 3.5 ppm higher than in 2023, representing the steepest one-year increase since records began.

    This unprecedented rise coincides with 2024 being the hottest year on record, with average global temperatures 1.55°C higher than pre-industrial levels, breaching the 1.5°C limit scientists consider critical to prevent irreversible impacts.

    Why This Is a Big Deal

    This spike is unprecedented in modern climate history. Never before have CO₂ levels risen so sharply in a single year. It not only breaks the trend of relative stability observed over the last decade but also exposes the collapse of the global climate response despite the Paris Agreement. The rate of increase (3.5 ppm) is more than four times the average annual increase recorded between 2011 and 2020.

    What makes this even more concerning is that both human-induced emissions (from fossil fuels, deforestation, and industrial activity) and natural feedback loops (like reduced ocean absorption and forest diebacks) are now amplifying each other, creating a self-perpetuating climate crisis.

    What Is Driving the Surge in CO₂ Concentrations?

    1. Record-breaking increase: Global average CO₂ near Earth’s surface reached 423.9 ppm in 2024, marking a 3.5 ppm rise, the largest annual jump ever.
    2. Failure of climate frameworks: Despite international efforts under the Paris Agreement, emissions continue to climb, reflecting inadequate implementation and weak compliance.
    3. Global warming feedback: Higher temperatures reduce oceans’ capacity to absorb CO₂ and increase droughts and wildfires, releasing more carbon into the atmosphere.
    4. Burning of fossil fuels: Continued dependence on coal, oil, and gas remains the primary driver, responsible for more than 90% of anthropogenic CO₂ emissions.

    How Are Natural Sinks Losing Their Absorptive Power?

    1. Reduced ocean absorption: Warmer oceans have absorbed less CO₂ in 2024 due to decreased solubility of gases in higher temperatures.
    2. Forest fires and droughts: A spike in wildfires and prolonged dry spells reduced the CO₂-absorbing capacity of trees and grasslands.
    3. Feedback loops: The decline of natural sinks worsens CO₂ imbalance, which in turn leads to even greater heat trapping and further degradation of these ecosystems.

    How Do Other Greenhouse Gases (GHGs) Compare?

    1. Methane (CH₄): Second-most potent GHG, rose by 8 parts per billion in 2024 to reach 1,924 ppb, slightly below last decade’s average but still historically high.
    2. Nitrous oxide (N₂O): Increased by 1 ppb to 338 ppb in 2024, contributing to long-term warming effects due to its 270-year lifespan.
    3. Relative potency: While CH₄ and N₂O are more heat-trapping per molecule, CO₂ dominates because of its sheer volume and persistence in the atmosphere for thousands of years.

    Why Is This Rise Unprecedented?

    1. Historical contrast: From the 1960s to 2010, CO₂ levels rose by 0.8 ppm per year; between 2011–2020, it increased by 2.4 ppm annually, far below the 2023–24 jump of 3.5 ppm.
    2. Crossing planetary limits: This rise pushed Earth past the 1.5°C warming threshold, previously considered a safe boundary.
    3. Interlinked causes: WMO attributes this to a mix of human emissions and natural CO₂ variability, indicating global climate systems are destabilizing.

    Challenges for Global Climate Action

    1. WMO warning: The new data underscores the difficulty in curbing GHG accumulation in the atmosphere.
    2. Failure of control mechanisms: Despite decades of negotiations, anthropogenic activities continue unchecked.
    3. Feedback intensification: Natural processes, once climate stabilizers, are now acting as amplifiers of warming.
    4. Paris Agreement setback: The emission reduction targets for 2030 are unlikely to be met, while global temperatures already breached the 1.5°C mark.

    Conclusion

    The record-breaking surge in CO₂ levels between 2023 and 2024 is not just a statistical anomaly, it’s a planetary red alert. The intertwining of human actions and natural feedback loops signifies that climate change has entered a runaway phase unless drastic global mitigation is undertaken. The failure to meet emission targets and the collapse of natural carbon sinks highlight that the climate crisis is no longer a distant threat, it’s a present emergency demanding immediate collective action.

    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: The article is important as it highlights the sharpest-ever rise in global CO₂ levels, signalling a critical climate tipping point and the failure of existing global frameworks like the Kyoto and Paris Agreements to curb emissions. It links directly with the question by showing how unchecked greenhouse gases are intensifying global warming and threatening climate stability.

  • Blackbuck Re-Introduction in Chhattisgarh

    Why in the News?

    Chhattisgarh launched a five-year Blackbuck Reintroduction Plan (2021–2026) at Barnawapara Wildlife Sanctuary to revive the species after 50 years of local extinction.

    Blackbucks have vanished from Chhattisgarh by the 1970s, primarily due to poaching, habitat loss, and grassland encroachment.

    About the Blackbuck (Antilope cervicapra):

    • Habitat: Native to India and Nepal, commonly found in Rajasthan, Gujarat, Madhya Pradesh, Odisha, and Tamil Nadu.
    • Physical Traits: Medium-sized antelope with males having spiral horns and black coats; known as the fastest land mammal in India.
    • Behaviour: Diurnal grazer that thrives in open plains and grasslands.
    • Ecological Role: Serves as an indicator species for grassland ecosystem health.
    • State Animal: Designated as the State Animal of Punjab, Haryana, and Andhra Pradesh.
    • Cultural Symbolism: Represents purity in Hinduism and good fortune in Buddhism.
    • Legal Protection:
      • Wildlife (Protection) Act, 1972: Schedule I.
      • IUCN Red List: Least Concern.
      • CITES: Appendix III.
    [UPSC 2017] In India, if a species of tortoise is declared protected under Schedule I of the Wildlife (Protection) Act, 1972, what does it imply?

    Options: (a) It enjoys the same level of protection as the tiger. *

    (b) It no longer exists in the wild, a few individuals are under captive protection; and how it is impossible to prevent its extinction.

    (c) It is endemic to a particular region of India.

    (d) Both (b) and (c) stated above are correct in this context.

     

  • [17th October 2025] The Hindu Op-ed: Ensure safeguards for India’s carbon market

    PYQ Relevance

    [UPSC 2015] Should the pursuit of carbon credit and Clean Development Mechanism set up under UNFCCC be maintained even though there has been a massive slide in the value of carbon credit? Discuss with respect to India’s energy needs for economic growth.

    Linkage: The article directly aligns with this PYQ as it examines how India can sustain carbon credit mechanisms while ensuring justice and inclusivity in its domestic carbon market. It stresses that ethical safeguards and equitable benefit-sharing are essential to reconcile climate finance with India’s growth needs.

    Mentor’s Comment

    In an era when climate markets are rapidly gaining traction, India’s push to create its own carbon credit trading system represents a major step towards balancing growth and sustainability. However, as global experiences reveal, the promise of carbon markets often hides complex questions of equity, consent, and justice. This article examines how India can build a just, transparent, and credible carbon market, drawing lessons from global failures and aligning with its developmental and environmental priorities.

    Why in the News

    India is rolling out its Carbon Credit Trading Scheme (CCTS), a landmark move that will create a domestic carbon market for emission trading and offset generation. The scheme comes amid a global boom in carbon credits, with 175–180 million credits retired annually. Yet, recent controversies such as the Northern Kenya Rangelands Carbon Project suspension by Verra (2023, 2025) have exposed how poorly governed carbon projects can violate community rights and reproduce colonial-style exploitation. This makes it crucial for India to institutionalize safeguards to prevent land alienation, ensure free, prior and informed consent (FPIC), and guarantee fair benefit-sharing, especially for farmers and marginalized communities who stand at the frontline of climate action.

    Introduction

    The industrial era’s growth model has pushed the Earth beyond its planetary boundaries, creating a need to decouple economic expansion from environmental degradation. For developing nations like India, degrowth is neither feasible nor just. The path forward lies in green growth, powered by cleaner energy, sustainable agriculture, and carbon crediting mechanisms that reward climate-positive behavior.

    However, as India builds its carbon market, it must ensure that climate justice is not sacrificed at the altar of climate finance.

    Growth and Sustainability, A Delicate Balance

    1. Decoupling growth from pollution: The industrial revolution model is no longer viable; India must grow while reducing emissions through renewable energy, micro-irrigation, and sustainable farming.
    2. Equitable development: Developing countries cannot afford “degrowth”; instead, they must innovate for green growth pathways that align prosperity with environmental protection.
    3. Indian examples: Rapid progress in solar energy and micro-irrigation exemplifies how growth and sustainability can reinforce each other.

    What Are Carbon Credits and Why Do They Matter?

    1. Definition: A carbon credit represents a certified reduction or removal of greenhouse gases (GHGs), measured in CO₂-equivalents.
    2. Generation sources: Created through mitigation activities like renewable energy or sequestration measures such as reforestation, agroforestry, and biochar.
    3. Global scenario: Annually, about 175–180 million credits are retired, with most originating from renewable energy and nature-based projects like REDD+.
    4. India’s initiative: The CCTS sets emission-intensity benchmarks for industries and includes voluntary offsetting mechanisms, managed through a national registry and trading platform.
    5. Emerging sectors: Draft methods for biomass, compressed biogas, and low-emission rice cultivation have already been released.

    The Promise and Peril of Carbon Projects

    1. Untapped agricultural potential: Despite 64 Indian projects listed under Verra, only four are registered, none have issued credits yet, largely due to weak farmer engagement and training gaps.
    2. Risk of exploitation: Without safeguards, carbon projects can mirror colonial plantation logic, especially as carbon prices rise.
    3. Global warning signs: The Northern Kenya Rangelands Carbon Project (2012) faced suspension for bypassing consent and misrepresenting community participation.

    Violations documented:

    1. Lack of FPIC from indigenous communities.
    2. Projects implemented on unregistered community land.
    3. Enforced by armed rangers; governance opaque.
    4. 2025 Kenyan court judgment confirmed absence of public participation.
    5. Parallel cases: The Lake Turkana Wind Project fenced 150,000 acres of community land — cutting herders off from water and grazing.
      1. Lake Turkana is the world’s largest permanent desert lake and the world’s largest alkaline lake. It lies mostly in northwestern Kenya, with its northern end extending into Ethiopia.

    India’s Vulnerability: A Warning from Kenya

    1. Community impact: Carbon projects on village commons, forest fringes, or grazing lands can disrupt traditional livelihoods without proper consent.
    2. Caste and equity issues: Agricultural carbon projects have shown tendencies to exclude marginalized caste farmers, offering minimal benefits.
    3. Regulatory gap: India’s CCTS prioritizes procedural compliance but neglects land rights, FPIC, and benefit-sharing — leaving space for exploitation.
    4. Potential consequence: Without reforms, India risks replicating extractive climate models that alienate vulnerable communities.

    Towards a Fair and Transparent Carbon Market

    1. Balanced regulation: Overregulation deters genuine actors, while underregulation invites exploitation. India needs a “light but firm” regulatory model.

    Core safeguards needed:

    1. Transparency: Mandatory disclosure of benefit-sharing agreements.
    2. Community consent: Institutionalize FPIC before project initiation.
    3. Adaptive regulation: Policies that evolve through stakeholder consultations.
    4. Trust building: Incorporate third-party audits and grievance redressal.
    5. Justice as the foundation: Climate action must empower, not exploit, those sustaining the land.

    Conclusion

    India’s journey toward a low-carbon future cannot rely solely on markets, it must rest on ethics, equity, and empowerment. As the Carbon Credit Trading Scheme (CCTS) takes shape, the focus must move beyond procedural compliance to protecting land rights, ensuring free, prior, and informed consent (FPIC), and guaranteeing fair benefit-sharing with those who nurture the environment. Learning from global pitfalls, India has the opportunity to design a carbon market that is transparent, just, and inclusive, turning climate finance into a true instrument of climate justice and sustainable development. Only then can India demonstrate that growth and green governance are not competing goals, but two sides of the same equitable future.

  • Carbon Di-oxide Levels in 2024 set new records: WMO

    Why in the News?

    The World Meteorological Organization (WMO) reported that carbon dioxide (CO₂) concentrations reached a record 423.9 ppm in 2024, marking the highest annual increase (3.5 ppm) since global measurements began in 1957.

    About WMO Report 2025:

    • Publisher: Issued by the World Meteorological Organization (WMO), the UN specialised agency for weather, climate, and water systems.
    • Document: The 2025 Greenhouse Gas Bulletin presents global atmospheric data for carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O).
    • Global Record: Confirms 2024 as the warmest year ever, with average temperatures 1.55 °C above pre-industrial (1850–1900) levels.
    • Context & Timing: Released ahead of COP30 (Belém, Brazil) to guide mitigation policies and national climate commitments.
    • Key Warning: Notes a record surge in CO₂ and the weakening of natural carbon sinks such as oceans and forests.

    Key Highlights about Greenhouse Gases:

    • Carbon Dioxide (CO₂): Global mean reached 423.9 ppm in 2024, up 3.5 ppm from 2023, the largest annual rise since 1957. Concentrations are 152 % above pre-industrial (278.3 ppm); land and ocean sinks are declining in efficiency.
    • Methane (CH₄): Climbed to 1,942 ppb, 166 % above pre-industrial levels; ~60 % of emissions stem from livestock, fossil fuels, and rice cultivation.
    • Nitrous Oxide (N₂O): Reached 338 ppb, 25 % higher than pre-industrial; emitted mainly from fertiliser use, biomass burning, and industry; the third major long-lived GHG.
    • Drivers of Increase: Human emissions, El Niño-linked droughts and wildfires, and reduced oceanic absorption, especially from the Amazon and southern Africa in 2024.

    Implications and Risks:

    • Warming Acceleration: CO₂ causes ~66 % of total warming and 79 % over the last decade; persistent buildup locks in long-term temperature rise.
    • Weakening Carbon Sinks: Warmer seas and drought-stricken lands absorb less CO₂, reinforcing a feedback loop of accumulation.
    • Extreme Events: Intensified heatwaves, floods, droughts, and wildfires signal proximity to irreversible tipping points like ice-sheet loss and coral die-off.
    [UPSC 2012] The increasing amount of carbon dioxide in the air is slowly raising the temperature of the atmosphere, because it absorbs

    Options: (a) the water vapour of the air and retains its heat.

    (b) the UV part of the solar radiation.

    (c) all the solar radiations.

    (d) the infrared part of the solar radiation. *

     

  • CG HC upholds cancellation of Forest Rights of Villagers

    Why in the News?

    The Chhattisgarh High Court has dismissed a petition challenging the cancellation of Community Forest Rights (CFRs) granted to villagers of Ghatbarra in the Hasdeo Arand forest, an area where Adani Enterprises–linked coal mines operate.

    Background of the Case:

    • Dispute Origin: The District-Level Committee (DLC) revoked CFR titles in 2016, citing that the area had already been diverted for mining in 2012 with MoEF clearance.
    • Petitioners’ Claim: The Hasdeo Arand Bachao Sangharsh Samiti argued that the Forest Rights Act (FRA), 2006 provides no revocation clause and that villagers were not given a fair hearing before cancellation.
    • Court’s View: The High Court upheld the State’s decision, calling the 2013 CFR grant a “mistake” void ab initio, and legally cancellable.

    Key Judicial Findings:

    • Legality of Revocation: FRA lacks explicit revocation provision, but erroneous grants may be rectified; hence cancellation was valid.
    • Prior Approvals Prevail: 2012 MoEFCC mining clearance overrode subsequent CFR grants.
    • State Mineral Ownership: FRA does not affect the State’s control over minerals beneath forest land.
    • Locus Standi: Petitioners lacked standing after the Forest Rights Committee withdrew; no authorised village representation remained.
    • Suppression of Facts: Petitioners had earlier challenged land acquisition (case dismissed in 2022) but failed to disclose it.

    Significance:

    This ruling marks the first judicial interpretation of whether forest rights granted under the Forest Rights Act, 2006 (FRA) can be revoked or cancelled, despite the Act containing no explicit provision for cancellation.

    About the Forest Rights Act (FRA), 2006:

    • Overview: The Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, 2006, commonly called the Forest Rights Act (FRA).
    • Purpose: Enacted to correct historical injustices faced by forest-dwelling communities deprived of traditional land and resource rights during colonial rule.
    • Core Objective: Ensures tenurial security, livelihood protection, and ecological stewardship of forest-dependent populations.
    • Beneficiaries: Covers Scheduled Tribes (STs) and Other Traditional Forest Dwellers (OTFDs) who have lived in and depended on forests for generations.
    • Scope: Recognises both individual and collective rights over forest land and produce, extending to cultivation, habitation, and minor forest produce use.
    • Governance Principle: Empowers Gram Sabhas as the central authority for recognising and managing forest rights, reinforcing local autonomy.
    • Integration Goal: Aligns forest governance with tribal self-rule, complementing the Panchayats (Extension to Scheduled Areas) Act, 1996 (PESA).

    Key Features of the FRA:

    • Individual & Community Rights: Legal recognition for occupation, cultivation, residence, and use/sale of minor forest produce.
    • Community Forest Resource (CFR) Rights: Grants Gram Sabhas control to protect, regenerate, and manage community forests.
    • Habitat Rights: Protects Particularly Vulnerable Tribal Groups (PVTGs) and pre-agricultural forest communities.
    • Governance Structure: Multi-level verification, Gram Sabha → Sub-Divisional Committee → District-Level Committee, for rights adjudication.
    • Development Provisions: Allows limited diversion of forest land for public utilities with Gram Sabha consent.
    • Eviction Safeguard: No eviction until claims are fully processed and rights recognised.
    • Decentralised Oversight: Empowers Gram Sabha as the final decision-making authority on forest rights and management.
    • Legal Integration: Reinforces PESA’s participatory governance and community-led conservation in Scheduled Areas.
    [UPSC 2021] At the national level, which ministry is the nodal agency to ensure effective implementation of the Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, 2006?

    Options: (a) Ministry of Environment, Forest and Climate Change
    (b) Ministry of Panchayati Raj
    (c) Ministry of Rural Development
    (d) Ministry of Tribal Affairs*

     

  • Sustainable Aquaculture in Mangrove Ecosystems (SAIME) Initiative

    Why in the News?

    The SAIME Initiative, developed by the Nature Environment and Wildlife Society (NEWS) in the Sundarbans of West Bengal, has been conferred Global Technical Recognition by the Food and Agriculture Organization (FAO) of the United Nations.

    What is SAIME Initiative?

    • Concept: A multi-stakeholder partnership model integrating shrimp aquaculture with mangrove restoration in the Sundarbans.
    • Implementing Agencies: Developed by the Nature Environment and Wildlife Society (NEWS) with support from the Global Nature Fund (Germany), Naturland, and Bangladesh Environment & Development Society (BEDS).
    • Purpose: Promotes climate-adaptive, conservation-linked livelihoods balancing ecological health with local economic growth.
    • Implementation: Covers 29.84 hectares with 42 fish farmers, achieving 100% rise in net profits through low-input, eco-friendly methods.
    • Target Group: Focuses on climate-vulnerable coastal communities, encouraging chemical-free shrimp farming to build coastal resilience.

    Core Features and Approach:

    • Ecosystem Integration: Maintains 5–30% mangrove cover within aquaculture ponds, directly linking productivity with ecosystem restoration.
    • Community Participation: Adopts a bottom-up co-management model, involving local farmers in planning, monitoring, and benefit-sharing.
    • Sustainable Practices: Utilises mangrove litter as shrimp feed, cutting chemical dependence and improving natural nutrient cycles.
    • Climate Resilience: Mitigates cyclones, salinity intrusion, and erosion, functioning as a nature-based adaptation system.
    • Economic Efficiency: Promotes low-input, high-yield aquaculture, enhancing smallholder profitability and resource efficiency.
    • Environmental Benefits: Supports carbon sequestration, biodiversity conservation, and blue carbon economy objectives.
    • Global Alignment: Advances SDG-13 (Climate Action), SDG-14 (Life Below Water), and SDG-15 (Life on Land) through integrated coastal sustainability.

    About the Sundarbans:

    Sustainable Aquaculture in Mangrove Ecosystems (SAIME) Initiative

    • Location: Situated in the South and North 24-Parganas districts of West Bengal, at the southern tip of the Gangetic Delta, where the Ganga, Brahmaputra, and Meghna rivers meet the Bay of Bengal.
    • Area: Currently spans 2,585.89 sq km, with an expansion proposal to 3,629.57 sq km, making it the largest mangrove forest in the world.
    • Status: Designated as a Tiger Reserve, National Park, Biosphere Reserve, and a UNESCO World Heritage Site (since 1987).
    • Topography: Characterised by a dense network of tidal creeks, estuaries, and 105 mangrove-covered islands, influenced by daily tidal inundation.
    • Flora and Fauna:
      • Flora: Dominated by Avicennia, Rhizophora, Sonneratia, and Heritiera species.
      • Fauna: Includes Royal Bengal Tiger, Fishing Cat, Estuarine Crocodile, Irrawaddy Dolphin, King Cobra, and several endangered bird species.
    • Boundaries:
      • East: Bangladesh border (Raimangal & Harinbhanga rivers)
      • South: Bay of Bengal
      • North/West: Matla, Bidya, and Gomdi rivers
    • Ecological Importance: Acts as a natural shield against cyclones and tsunamis, a carbon-rich ecosystem, and a vital nursery ground for fisheries — forming the ecological heart of India’s blue economy and coastal resilience framework.

     

    [UPSC 2023] Which one of the following is the best example of repeated falls in sea level, giving rise to present-day extensive marshland?

    Options: (a) Bhitarkanika Mangroves

    (b) Marakkanam Salt Pans

    (c) Naupada Swamp

    (d) Rann of Kutch*

     

  • IUCN Redlist Update of Indian Species

    Why in the News?

    In the latest State of India’s Birds (SoIB) 2025 report and IUCN assessment, four bird species dependent on these ecosystems have been uplisted, reflecting alarming habitat loss and population decline.

    Bird Species Uplisted by IUCN:

    1. Indian Courser (Cursorius coromandelicus):
      • Endemic to the Indian Subcontinent.
      • Uplisted from Least Concern → Near Threatened due to loss of grasslands and fallow land.
    2. Indian Roller (Coracias benghalensis): Uplisted to Near Threatened; impacted by habitat conversion and electrocution from power lines.
    3. Rufous-tailed Lark (Ammomanes phoenicura): Uplisted to Near Threatened; declining due to intensive agriculture and land-use change.
    4. Long-billed Grasshopper-Warbler (Locustella major): Uplisted to Endangered; severely impacted by loss of reedbeds and open scrub habitat.

    About State of India’s Birds (SoIB) Assessment:

    • Overview: SoIB is conducted by the State of India’s Birds Partnership, a consortium of 13 government and non-government institutions, including BNHS, WII, ZSI, SACON, WTI, WWF-India, ATREE, NCF, FES, Wetlands International – South Asia, NCBS, and NBA.
    • Coverage: Of 1,360 bird species assessed globally, 12 species were from India.
    • Findings:
      • 8 species downlisted (showing improved conservation trends).
      • 4 species uplisted, highlighting heightened risk of extinction.
    • The report underscores the fragility of India’s open-country habitats, which support a unique but shrinking avifaunal diversity.

  • Graded Response Action Plan (GRAP)

    Why in the News?

    The Commission for Air Quality Management (CAQM) has invoked Stage I of the Graded Response Action Plan (GRAP) across the Delhi–NCR as air quality slipped into the ‘poor’ category (AQI 211) after more than three months.

    What is Air Quality Index (AQI)?

    • Purpose: Quantifies pollution levels and health impact using major pollutants — PM₂․₅, PM₁₀, SO₂, NO₂, CO, O₃, NH₃, Pb.
    • Scale:
      1. 0–50 = Good
      2. 51–100 = Satisfactory
      3. 101–200 = Moderate
      4. 201–300 = Poor
      5. 301–400 = Very Poor
      6. 401–450 = Severe
    • >450 = Severe Plus
    • Interpretation: Higher AQI ⇒ greater exposure risk, particularly for children, elderly, and respiratory patients.

    About Graded Response Action Plan (GRAP):

    • Objective: To ensure anticipatory, graded, and region-wide responses that reduce PM₂․₅ and PM₁₀ concentrations, controlling emissions from vehicles, dust, and industries.
    • Coverage: Applies across Delhi, Haryana, Uttar Pradesh, Rajasthan, and other NCR districts, ensuring uniform regional implementation.
    • Legal Mandate: Issued under Section 5 of the Environment (Protection) Act, 1986, binding on all NCR states and agencies.
    • Genesis: Approved by the Supreme Court in 2016 (M.C. Mehta vs. Union of India) and notified in Jan 2017 by MoEFCC under the Environment (Protection) Act, 1986.
    • Implementation: Initially enforced by EPCA (till 2020); now implemented by the Commission for Air Quality Management (CAQM) established via ordinance in Oct 2020.
    • Functioning: CAQM works with CPCB, IMD, and IITM Pune, which provide forecast-based modelling for pre-emptive action.
    • Key Stages of Action:
      1. Stage I (Poor: 201–300): Road sweeping, water sprinkling, dust control at sites, solid-waste removal, old-vehicle enforcement.
      2. Stage II (Very Poor: 301–400): Hotspot regulation, DG set restrictions, enhanced public transport.
      3. Stage III (Severe: 401–450): Ban on BS-III petrol & BS-IV diesel cars, construction halt, school closures.
      4. Stage IV (Severe+ >450): Complete construction ban, truck entry restriction (essentials exempted), curbs on non-essential vehicles.
    [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*

     

  • What are Climate Tipping Points?

    Why in the News?

    The Global Tipping Points Report (2025), authored by 160 scientists from 23 countries, warns that warm-water coral reefs have already crossed their thermal tipping point, triggering irreversible dieback.

    About Tipping Points:

    • Overview: Tipping Points are critical thresholds in Earth’s natural and climate systems beyond which self-reinforcing and often irreversible changes occur.
    • Mechanism: Once crossed, feedback loops accelerate transformation — e.g., melting permafrost releases methane, which increases warming and causes more melting.
    • Irreversibility: Even if greenhouse gas emissions are later reduced, many systems cannot revert to their original stable state.
    • Significance: Tipping Points determine long-term planetary stability, climate predictability, and biosphere resilience.

    Important Definitions:

    • Climate Tipping Point (IPCC): A critical threshold at which small changes in temperature or forcing cause a large, often irreversible shift in a climate subsystem.
    • Feedback Loop: A process where an initial change triggers further effects that amplify the original disturbance (positive feedback).
    • Hysteresis: The property of a system where reversing to its prior state requires conditions much different from those that caused the initial change.
    • Cascade Effect: A phenomenon where crossing one tipping point triggers others in connected Earth systems, leading to compounded impacts.
    • Thermal Tipping Point (for Coral Reefs): The temperature threshold (~1.2°C above pre-industrial) beyond which coral survival and recovery become impossible.

    Key Global Tipping Points Identified:

    • Ice Sheets: Collapse of Greenland and West Antarctic ice sheets, committing the planet to multi-metre sea-level rise.
    • Coral Reefs: Permanent dieback of warm-water reefs due to ocean warming and acidification, destroying marine biodiversity.
    • Amazon Rainforest: Shift toward a savannah ecosystem, reducing carbon storage and regional rainfall.
    • Atlantic Meridional Overturning Circulation (AMOC): Potential shutdown below 2°C, disrupting global heat distribution and monsoon patterns.
    • Permafrost Thaw: Release of methane and CO₂, reinforcing global warming.
    • Boreal Forests & Mountain Glaciers: Increased risk of widespread dieback and loss of freshwater reserves.
    • Sub-Polar Gyre (SPG): Destabilization in North Atlantic circulation, altering marine ecosystems and heat flow.

    Highlights from the Latest Reports (Global Tipping Points 2025):

    • Study Scale: Conducted by 160 scientists from 23 countries, assessing multiple Earth-system thresholds.
    • Coral Crisis: Since January 2023, 84.4% of coral reefs across 82 nations have suffered bleaching — marking the fourth global mass event, the worst on record.
    • Temperature Thresholds: Exceeding 1.5°C global warming risks triggering multiple tipping points; 1.2°C already breached for warm-water reefs.
    • AMOC Collapse Risk: Could occur below 2°C, potentially plunging northwest Europe into severe winters and disrupting global food and water systems.
    • Amazon Dieback: Widespread collapse possible below 2°C, directly affecting 100+ million people dependent on its ecosystem.
    • Interconnected Risk: Earth’s systems form a tipping network — crossing one threshold may accelerate others, creating a domino-like cascade.
    • Policy Warning: Current Paris Agreement pledges and net-zero targets are inadequate to limit warming below 2°C.
    [UPSC 2024] One of the following regions has the world’s largest tropical peatland, which holds about three years’ worth of global carbon emissions from fossil fuels, and the possible destruction of which can exert a detrimental effect on the global climate.

    Which one of the following denotes that region?

    Options: (a) Amazon Basin (b) Congo Basin* (c) Kikori basin (d) Rio De La Plata Basin