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Subject: Environment

  • What is Keeling Curve?

    Why in the News?

    Atmospheric CO₂ levels hit a record high in 2024 due to wildfires and human activities, as shown by the Keeling Curve, a 67-year record maintained at Mauna Loa Observatory since 1958.

    What is Keeling Curve?

    What is Keeling Curve?

    • The Keeling Curve is a long-term record of atmospheric CO₂ concentrations, initiated by Charles David Keeling in 1958 at the Mauna Loa Observatory, Hawaii.
    • It tracks the rise in CO₂ levels and provides evidence of the impact of human activities on climate change.
    • Named after Charles David Keeling, it has become a globally recognized tool for understanding global warming.

    Significant Features and Sources:

    • Steady Upward Trend: Demonstrates a consistent rise in atmospheric CO₂ levels since 1958, primarily due to fossil fuel combustion and deforestation.
    • Seasonal Fluctuations:
      • CO₂ levels decrease during spring and summer as plants absorb CO₂ through photosynthesis.
      • Levels increase during fall and winter when plant decay releases CO₂.
    • Initial Measurements: Recorded CO₂ levels at 315 ppm in 1958.
    • Current Levels: As of January 2025, CO₂ concentrations have reached 427.1 ppm, the highest in millions of years.
    • Data Sources: Measurements are taken from Mauna Loa Observatory and other global monitoring stations.

    Observations around the Curve

    • Key Milestones:
      • 1988: CO₂ levels reached 350 ppm, drawing global attention to climate change.
      • 2023: Levels exceeded 420 ppm, marking a critical point in atmospheric history.
      • 2024: Record growth of 3.58 ppm in average annual CO₂ concentrations compared to 2023.
    • Contributing Factors:
      • El Niño: Surface temperature rise in the Pacific Ocean boosted CO₂ emissions during 2024, exacerbated by wildfires in North and South America.
      • Anthropogenic Emissions: Burning fossil fuels and land-use changes remain major contributors.
    • Global Implications:
      • Contradicts IPCC scenarios for limiting global warming to 1.5°C, as emissions continue to rise.
      • Record increases in CO₂ levels during El Niño events highlight the interplay between natural phenomena and human activities.

    PYQ:

    [2011] Consider the following:

    1. Photosynthesis

    2. Respiration

    3. Decay of organic matter

    4. Volcanic action

    Which of the above add carbon dioxide to the carbon cycle on Earth?

    (a) 1 and 4 only

    (b) 2 and 3 only

    (c) 2, 3 and 4 only

    (d) 1, 2, 3 and 4

  • In news: Chincholi Wildlife Sanctuary

    Why in the News?

    The Kalaburagi Forest Division is working to relocate a hamlet within the Chincholi Wildlife Sanctuary on the Karnataka-Telangana border to a safer area.

    About the Chincholi Wildlife Sanctuary

    Details
    • Declared a wildlife sanctuary in 2011, covering 134.88 sq. km.
    • Recognized as the first dryland Wildlife Sanctuary in South India.
    • Located in the Kalaburagi District, renowned for its floristic diversity.
    • Contributes to the conservation of dryland ecosystems.
    Geographical Location
    • Situated in the Hyderabad Karnataka region.
    • Features the Chandrampalli Dam and four smaller dams within the sanctuary.
    Flora and Fauna
    • Flora: Rich in medicinal plants and tree species like Red Sanders, Sandalwood, Acacia, and Teak.
    • Fauna:
      • Mammals: Blackbuck, Common Fox, Four-horned Antelope, Indian Wolf, Hyena, and Fruit Bat.
      • Birds: Over 35 species, including Black Drongo, Black-winged Kite, Blossom-headed Parakeet, Blue Pigeon, Black-headed Oriole, and Grey Partridge.
    Climatic/Geographical Features
    • Comprises dry deciduous and moist deciduous forests.
    • Fringes are planted with Acacia and Teak.
    • Supports a dryland ecosystem with water bodies like the Chandrampalli Dam.
    • Features a mix of arid and semi-moist climatic conditions.

     

    PYQ:

    [2018] In which one of the following States is Pakhui Wildlife Sanctuary located?

    (a) Arunachal Pradesh

    (b) Manipur

    (c) Meghalaya

    (d) Nagaland

  • Species in news: Indian Bison (Gaur)

    Why in the News?

    The Jharkhand Forest department has initiated a study to revive the dwindling population of Bison, popularly known as Gaur, at Palamu Tiger Reserve (PTR).

    bison

    About Indian Bison (Gaur)

    Details
    • Largest and tallest species in the wild cattle family.
    • Scientific Name: Bos gaurus.
    • Indigenous to South and Southeast Asia.
    Species Habitat and Location
    • Found in evergreen, semi-evergreen, and moist deciduous forests with open grasslands.
    • Prefers hilly terrains below 1,500–1,800 m with abundant water.
    • Distributed across India, Nepal, Bhutan, Myanmar, and Thailand.
    Behavioural Features
    • Social animals living in herds of 30–40 individuals.
    • Strong and sturdy limbs, short tails, and inward-curved pale green/yellowish-brown horns.
    • Males weigh 600–1,500 kg; females weigh 400–1,000 kg.
    • Convex-shaped forehead; height ranges from 170–230 cm.
    Conservation Status
    • IUCN Red List: Vulnerable.
    • Wildlife Protection Act, 1972: Schedule I.
    • CITES: Appendix I.

     

    PYQ:

    [2011] A sandy and saline area is the natural habitat of an Indian animal species. The animal has no predators in that area but its existence is threatened due to the destruction of its habitat. Which one of the following could be that animal?

    (a) Indian wild buffalo

    (b) Indian wild ass

    (c) Indian wild boar

    (d) Indian gazelle.

  • 1st Battalion of NDRF celebrates 20th Raising Day

    Why in the News?

    The 1st Battalion of the National Disaster Response Force (NDRF) celebrated its 20th Raising Day.

    About the National Disaster Response Force (NDRF)

    Details
    About 
    • Constituted under Section 44 of the Disaster Management Act, 2005 for specialized disaster response.
    • Functions under the Ministry of Home Affairs (MHA) and is headed by a Director General (DG), typically an IPS officer.
    • Initially established in 2006 with 8 battalions, now expanded to 16 battalions.
    • Operates under the National Disaster Management Authority (NDMA), chaired by the Prime Minister.
    Powers and Functions
    • Primary Role: Rescue and relief operations during natural and man-made disasters such as floods, cyclones, earthquakes, landslides, building collapses, and accidents.
    • Strategic Deployment: Resources are pre-positioned during imminent disaster situations to minimize damage.
    • Active in international relief efforts, including the 2011 Fukushima disaster and the 2015 Nepal Earthquake.
    • Provides multi-skilled, highly specialized responses, with capabilities for handling complex disaster scenarios.
    Composition
    • Consists of 16 battalions, each with 1,149 personnel.
    • Personnel are drawn from Central Armed Police Forces (CAPFs): CRPF, BSF, CISF, ITBP, SSB, and Assam Rifles.
    • Members are trained in disaster response, relief, and recovery operations.
    • Focus on proactive availability and pre-positioning during disasters to ensure quick response.

     

    IMPORTANT: National Disaster Response Fund (NDRF)

    • The NDRF is a statutory body constituted under the Disaster Management Act, 2005.
    • It supplements State Disaster Response Fund (SDRF) of a State, in case of a disaster of severe nature, provided adequate funds are not available in SDRF.
    • The July 2015 guidelines states that natural calamities of cyclone, drought, earthquake, fire, flood, tsunami, hailstorm, landslide, avalanche, cloud burst, pest attack and cold wave and frost will qualify for immediate relief assistance from NDRF.
    • NDRF is managed in the “Public Accounts” under “Reserve Funds not bearing interest”.
    • The Comptroller and Auditor General of India (CAG) audits the accounts of NDRF.

     

    PYQ:

    [2020] Discuss the recent measures initiated in disaster management by the Government of India departing from the earlier reactive approach.

  • Can Bhopal waste be safely disposed of?

    Why in the News?

    The Madhya Pradesh High Court gave authorities four weeks to dispose of the waste, nearly 40 years after the gas disaster that killed over 4,000 people and left thousands more injured or disabled.

    What are the plans for the hazardous gas leak waste? 

    • Waste Transportation: The Madhya Pradesh government has successfully transported 358 tonnes of hazardous waste from the Union Carbide facility in Bhopal to the Treatment, Storage, and Disposal Facility (TSDF) in Pithampur, Dhar district, following a court order.
    • Incineration Process: The waste will be incinerated at the Pithampur facility, with an initial timeline of three to nine months for complete disposal, depending on emissions and safety assessments during the process.
    • Emission Controls: To mitigate air pollution, the incinerator will utilize four-layer special filters to ensure that the smoke emitted does not contaminate the surrounding environment.
    • Post-Incineration Measures: After incineration, the resulting ash will be covered with a two-layer membrane and buried in a landfill to prevent any contact with soil and water sources.
    • Expert Supervision: The entire disposal process will be overseen by officials from the Central Pollution Control Board and State Pollution Control Board, ensuring compliance with safety regulations and environmental standards.

    How much has been allocated to incinerate the waste and deposit the residue at a landfill in Pithampur?

    • The Central government has allocated ₹126 crore (approximately $15 million) to facilitate the incineration of this waste and ensure that any resulting residue is safely deposited in a landfill at the Pithampur facility.

    Why have there been protests?

    • Health and Environmental Fears: Residents are worried that the incineration of toxic waste will pose significant health risks and environmental hazards to the local population and surrounding areas, with claims that it could lead to harmful emissions affecting air quality.
    • Historical Context: The protests are fueled by the legacy of the 1984 Bhopal gas tragedy, which resulted in thousands of deaths and long-term health issues. This history has heightened sensitivity to any activities involving hazardous materials in the region.
    • Community Mobilization: Local organizations, such as the ‘Pithampur Bachao Samiti’, have organized bandhs (shutdowns) and demonstrations, leading to widespread participation from residents who are calling for the waste to be returned to Bhopal instead of being incinerated locally.

    What is the 1984 Bhopal gas tragedy?

    The Bhopal gas tragedy, also known as the Bhopal disaster, occurred on the night of December 2-3, 1984, at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, India.  

    • Chemical Leak: The disaster was triggered by a leak of approximately 40 tons of methyl isocyanate (MIC), a highly toxic gas used in pesticide production. This gas escaped from a storage tank due to a combination of operational failures and safety deficiencies at the plant.
    • Immediate Impact: The gas cloud spread over densely populated areas surrounding the plant, leading to immediate chaos and panic. Official estimates indicate that around 3,787 people died as a direct result of the gas exposure, while other estimates suggest that the death toll could be as high as 15,000 to 20,000 over subsequent years due to related health complications.
    • Injuries and Long-term Effects: Over 558,000 individuals suffered injuries ranging from respiratory problems to permanent disabilities. Many survivors continue to experience health issues related to their exposure to the toxic gas.

    Way forward: 

    • Strengthen Public Engagement and Transparency: Conduct comprehensive awareness campaigns involving scientific experts to address community concerns, ensuring transparent communication about safety measures, emission controls, and environmental safeguards during the incineration process.
    • Enhance Monitoring and Compliance: Implement stringent real-time monitoring of emissions and groundwater quality during and after waste disposal, supervised by independent experts and regulatory bodies, to uphold environmental and public health standards.

    Mains PYQ:

    Q 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? (UPSC IAS/2018)

  • Survey adds 24 new species to Munnar’s faunal stock

    Survey adds 24 new species to Munnar’s faunal stock

    Why in the News?

    A recent faunal survey conducted in the Munnar Wildlife Division has documented 24 new species of birds, butterflies, and odonates, enriching its biodiversity checklist.

    Which are the surveyed sites?

    All the surveyed national parks and wildlife sanctuaries are located in Kerala, India, specifically in the Idukki district:

    • Mathikettan Shola National Park (MSNP): It is a biodiversity hotspot and part of the Western Ghats.
    • Pambadum Shola National Park (PSNP): It is Kerala’s smallest national park and home to unique flora and fauna.
    • Anamudi Shola National Park (ANP): Named after Anamudi, the highest peak in South India.
    • Kurinjimala Wildlife Sanctuary (KWLS): Located in Idukki, it protects the habitat of the Neelakurinji (Strobilanthes kunthiana), a flower that blooms once every 12 years.
    • Eravikulam National Park (ENP): Famous for the Nilgiri Tahr.
    • Chinnar Wildlife Sanctuary (CWLS): Situated in the rain-shadow region of the Western Ghats, near the Kerala-Tamil Nadu border in Idukki.

    Key Highlights of the Survey

    • New Species Added: 24 new species, including birds (11), butterflies (8), and odonates (5).
    • Total Documentation:
      • Birds: 217 species recorded; checklist updated to 258.
      • Butterflies: 166 species recorded; checklist updated to 246.
      • Odonates: 5 new records, checklist updated to 58 species.
    • Notable Wildlife Observed: Mammals like Nilgiri Tahr, tigers, leopards, and elephants; 12 species of reptiles and amphibians.

    About the Added Species

    • Birds:
      • New Additions: Brown Hawk Owl, Barred Buttonquail, Spotted Owlet, Mottled Wood Owl, Baya Weaver, Red Munia, Richard’s Pipit, Jerdon’s Bushlark, Golden-Headed Cisticola, Large Grey Babbler, Chestnut-Bellied Nuthatch.
      • Highlights: Nilgiri Wood Pigeon, Steppe Eagle, Peregrine Falcon, Indian Grey Hornbill, and Blue-eared Kingfisher.
    • Butterflies:
      • Endemic Species: Red-disc Bushbrown, Palni Fritillary, Nilgiri Tiger, Nilgiri Four-ring.
      • Unique Sightings: Grass Jewel (smallest butterfly in Kerala), Southern Birdwing (largest butterfly in India).
    • Odonates (flying insects):
      • New Records: Cratilla lineata calverti, Macrodiplax cora, Palpopleura sexmaculata, Tholymis tillarga, Lestes elatus.

    PYQ:

    [2020] With reference to India’s biodiversity Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are:

    (a) Birds

    (b) Primates

    (c) Reptiles

    (d) Amphibans

  • In news: Yala Glacier

    Why in the News?

    Yala Glacier in Nepal is predicted to disappear by the 2040s due to rapid retreat and mass loss. It is the only glacier in the Himalayas listed on the Global Glacier Casualty List, an initiative launched in 2024 to document endangered or vanished glaciers worldwide.

    Note:  The UN has designated 2025 as the International Year of Glacier Preservation, with March 21st to be observed annually as World Glacier Day starting from 2025.

    About the Yala Glacier 

    • Yala Glacier is located in the Langtang Valley, central Nepal, and is influenced by the Indian summer monsoon.
    • It is one of the most studied glaciers in Nepal and represents the Hindu Kush Himalayan region in the World Glacier Monitoring Service (WGMS) database.
    • The glacier has been monitored for over a decade using stakes, snow pits, and satellite images, providing crucial data on the state of Himalayan glaciers.
    • It is the only glacier in the Himalayas included in the Global Glacier Casualty List, a recognition of its critical status.
    • It plays a vital role in studying the cryosphere, a critical water resource supporting 240 million people in the Himalayan region.

    Retreat of Yala Glacier

    • Yala Glacier is projected to disappear by the 2040s, reflecting the growing threat to Himalayan glaciers.
    • It has retreated by 680 meters between 1974 and 2021, with a 36% reduction in area during this period.
    • Its elevation, which ranged between 5,170m and 5,750m in 2011, has significantly declined.
    • The glacier has lost so much mass that it no longer meets scientific standards for effective observation.
    • The Hindu Kush Himalayan cryosphere is warming twice as fast as the global average, leading to rapid glacial retreat.

    About the Global Glacier Casualty List

    • It was launched in 2024 by a consortium of institutions including Rice University, World Glacier Monitoring Service (WGMS), World Meteorological Organization (WMO), and UNESCO.
    • It documents endangered or vanished glaciers.
    • Glaciers Listed: Includes 15 glaciers, such as:
      • Pico Humboldt Glacier (Venezuela): Disappeared in 2024.
      • Sarenne Glacier (France): Vanished in 2023.
      • Dagu Glacier (China): Categorized as “critically endangered,” expected to vanish by 2030.
    • Significance:
      • Highlights the urgency of glacier preservation, as these ice masses store 70% of global freshwater and influence water security for billions of people worldwide.
      • Reinforces the need for global cooperation to address the accelerating loss of glaciers due to climate change

     

    PYQ:

    [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 following pairs given above are correctly matched?

    (a) 1,2 and 4

    (b) 1,3 and 4

    (c) 2 and 5

    (d) 3 and 5

  • What is Hydroclimate Whiplash?

    Why in the News?

    Since earlier this month Los Angeles has been gripped by devastating wildfires fueled by a rare and alarming meteorological phenomenon known as hydroclimate whiplash.

    What is Hydroclimate Whiplash?

    • Hydroclimate whiplash refers to rapid and extreme shifts between periods of intensely wet weather and dangerously dry conditions.
    • Characteristics:
      • Alternates between heavy rainfall and severe drought.
      • Typically results in amplified weather extremes, such as floods followed by wildfires.
    • Global Trend:
      • Hydroclimate whiplash has increased by 31% to 66% worldwide since the mid-20th century, largely due to climate change.
      • Projections indicate a 113% rise in such events during sub-seasonal periods with a 3°C increase in global temperatures.

    Causes of Hydroclimate Whiplash

    • Rising global temperatures intensify hydrological extremes, causing prolonged periods of rainfall and drought.
    • Warmer air holds more moisture, leading to heavier rainfalls during wet periods and exacerbating droughts during dry phases.
    • Shifts in El Nino-Southern Oscillation (ENSO) cycles influence precipitation and temperature extremes.
    • Changes in ocean currents and wind patterns disrupt normal weather cycles, contributing to hydroclimate variability.
    • Unusual delays in wet or dry seasons can magnify hydroclimate swings, as seen in regions like California.

    How did this phenomenon cause wildfire in LA?

    • The usual wet season, which begins in October, failed during 2024-25, exacerbating dry conditions and increasing fire hazards.
    • As dry air moves from high-pressure regions over southwestern deserts to low-pressure zones off the California coast, it warms and dries further, creating ideal wildfire conditions.

    PYQ:

    [2011] La Nina is suspected to have caused recent floods in Australia. How is La Nina different from El Nino?

    1. La Nina is characterised by an usually cold ocean temperature in equatorial Indian Ocean whereas El Nino is characterised by unusually warm ocean temperature in the equatorial Pacific Ocean.

    2. El Nino has adverse effect on south-west monsoon of India but La Nina has no effect on monsoon climate.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

  • Need quake warning systems: PM; working to better accuracy by 10-15%, says IMD DG

    Why in the News?

    Recently, PM released the IMD’s Vision Document 2047, outlining a plan to achieve nearly perfect weather forecasts for up to three days and 90% accuracy for forecasts made five days ahead by 2047.

    What is IMD’s Vision Document 2047? 

    • The Vision Document aims for zero-error forecast accuracy for up to three days lead time and 90% accuracy for forecasts issued five days in advance by 2047. This ambitious target reflects India’s commitment to improving weather forecasting capabilities significantly.
    • Focus Areas: The document emphasises enhancing weather surveillance technologies, improving atmospheric observations, and leveraging high-performance computing systems.
      • It also highlights the importance of developing advanced earth system models and data-driven methods, including the use of AI and machine learning.

    Why does India need an Earth warning system? 

    • High Seismic Vulnerability: India lies in a seismically active zone, with regions like Himachal Pradesh, Uttarakhand, and the Northeast being particularly earthquake-prone. Early warning systems can help reduce damage and save lives in these areas. Example: The 2001 Gujarat earthquake caused widespread devastation.
    • Risk to Dense Urban Areas: Major cities like Delhi, Mumbai, and Kolkata are vulnerable to earthquakes. Early warnings can help evacuate people, protect infrastructure, and minimize casualties. Example: A strong earthquake in Delhi could severely impact millions.
    • Limited Preparedness and Response Time: Earthquakes give little to no time for people to react. A warning system could provide crucial seconds or minutes to activate emergency protocols, limiting loss of life and property. Example: The 2015 Nepal earthquake caused devastation in northern India.

    How can India achieve zero-error accuracy in forecasting disasters?

    • Technological Advancements: The implementation of Mission Mausam involves deploying next-generation radars, satellites with advanced instruments, and high-performance computing systems. These tools are crucial for improving the precision of weather predictions.
    • Data Assimilation and Modeling: Enhancing data assimilation processes and developing improved earth system models will contribute to better forecasting accuracy. The integration of AI/ML tools is expected to refine weather predictions further.
    • Capacity Building: The initiative will also focus on building capacity within meteorological services to ensure that no severe weather events go undetected. This includes training personnel and enhancing operational frameworks for the timely dissemination of forecasts.

    What are the steps taken by the Indian Government in the past year?

    • Amendment of the Disaster Management Act: In August 2024, the government introduced the Disaster Management (Amendment) Bill, 2024, in the Lok Sabha.
      • This bill proposes the establishment of Urban Disaster Management Authorities for state capitals and large cities, the creation of disaster databases at national and state levels, and the formation of State Disaster Response Forces to strengthen disaster response capabilities.
    • Investment in Urban Flood Mitigation: In August 2024, India announced plans to invest nearly $300 million over two years to mitigate urban flooding and conserve water in major cities, including Mumbai, Chennai, and Bengaluru.
      • The initiative focuses on expanding water bodies like lakes and constructing drainage systems to manage excessive rainfall during monsoon seasons.
    • Addressing Urban Heat Islands: In June 2024, government officials acknowledged that rapid urbanization has turned cities into “heat traps,” exacerbating the effects of heatwaves.
      • Efforts are underway to implement heat action plans, which include provisioning drinking water, improving medical facilities, rescheduling outdoor work, and increasing green spaces to mitigate urban heat.
    • Enhancement of Early Warning Systems: The government has been working to improve early warning systems for various natural disasters, including floods and heatwaves, to provide timely alerts and reduce the impact on vulnerable populations.
    • Capacity Building and Training: There has been a focus on training and capacity building for disaster response teams at both national and state levels. For instance, In 2024, the NDRF organised a multi-agency mock drill in Assam to simulate a response to a major flood disaster.

    What are the challenges in forecasting a disaster?

    • Data Gaps and Limited Technology: Forecasting requires high-quality, real-time data from advanced technologies like satellite imagery, weather radars, and seismic sensors. However, data scarcity in remote areas or regions with underdeveloped infrastructure hampers accurate predictions.
      • Example: The 2013 Kedarnath floods in India resulted from a cloudburst that was not forecasted in time due to a lack of localized meteorological data and advanced radar systems.
    • Unpredictability of Natural Phenomena: Some disasters, such as earthquakes and tsunamis, are inherently unpredictable because they result from sudden geological shifts.
      • Example: The 2004 Indian Ocean tsunami followed a massive earthquake, but the lack of a regional tsunami warning system in the Indian Ocean made it impossible to alert affected countries in time.
    • Challenges in Communication and Dissemination: Even when forecasts are accurate, ineffective communication of warnings to vulnerable populations due to language barriers, poor outreach, or lack of awareness can render forecasts ineffective.
      • Example: During Cyclone Tauktae (2021) in India, while the forecast was accurate, several fishermen ignored warnings to evacuate, leading to fatalities despite advanced cyclone prediction systems.

    Way forward: 

    • Strengthen Technological and Data Capabilities: Invest in localized weather stations, advanced radar systems, and seismic sensors in remote areas, while leveraging AI and machine learning for precise forecasting and real-time data integration.
    • Enhance Community Awareness and Communication: Develop multilingual, accessible early warning systems and conduct regular public awareness campaigns to ensure timely dissemination and community readiness during disasters.

    Mains PYQ:

    Q Discuss the recent measures initiated in disaster management by the Government of India departing from the earlier reactive approach. (UPSC IAS/2020)

  • What is Pink Fire Retardant?

    What is Pink Fire Retardant?

    Why in the News?

    Air tankers have dropped thousands of litres of pink fire retardant (PFR) to slow the spread of wildfires in Los Angeles.

    Pink Fire Retardant (PFR) and its properties

    • The PFR is a chemical mixture designed to slow or suppress wildfires by reducing the flammability of vegetation and other materials.
    • The most recognized brand of PFR is Phos-Chek, manufactured by Perimeter Solutions.
    • It is primarily made of ammonium phosphate-based slurry, including:
      • Monoammonium phosphate (80%-90%).
      • Diammonium phosphate.
      • Performance additives for enhanced effectiveness.
      • Pink dye for visibility.
    • It is sprayed as a foam or slurry to coat vegetation ahead of wildfires.
    • It slows combustion by:
      • Depleting oxygen needed for flames.
      • Altering how cellulose (plant material) decomposes, creating non-flammable carbon.
    • Unlike water, which evaporates quickly, PFR’s chemical components remain effective for days or weeks, providing long-term protection.

    Significance of PFR

    • Provides fire-fighters with critical time to control wildfires.
    • Creates firebreaks by coating vegetation and preventing ignition.
    • Effective in diverse terrains, slopes, and weather conditions.
    • Helps protect natural habitats and human infrastructure by slowing wildfire spread.
    • Reduces the scale and intensity of wildfires, minimizing ecological damage.

    PYQ:

    [2019] Consider the following:

    1. Carbon monoxide
    2. Methane
    3. Ozone
    4. Sulphur dioxide

    Which of the above are released into atmosphere due to the burning of crop/biomass residue?

    (a) 1 and 2 only
    (b) 2, 3 and 4 only
    (c) 1 and 4 only
    (d) 1, 2, 3 and 4