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Subject: Geography

  • ​Monsoon woes: On the southwest monsoon and the northeast

    Why in the News?

    In 2025, the Southwest Monsoon, which plays a vital role in India’s farming economy, brought heavy and destructive rains. Instead of simply starting the farming season, it has caused widespread damage across the northeastern states.

    Why is the northeastern region particularly vulnerable to monsoon-related disasters?

    • Geographical Terrain and River Systems: The Northeast has a complex topography of steep hills and fast-flowing rivers like the Brahmaputra and Barak. These rivers often overflow during monsoon, causing floods and erosion. Eg: In Assam, over 10 major rivers flowed above danger level in June 2025, affecting over 3 lakh people across 19 districts.
    • High and Prolonged Rainfall: The region receives one of the highest average monsoon rainfalls in India, making even a “below normal” monsoondestructive. Eg: Despite IMD predicting lower-than-normal rainfall, Assam, Tripura, and Sikkim faced flash floods and landslidesin May–June 2025.
    • Dual Monsoon Exposure and Fragile Ecology: The region experiences both the southwest monsoon (June–September) and a retreating monsoon (October–December), increasing disaster exposure. The fragile ecology, including deforestation and slope instability, worsens risks. Eg: In North Sikkim, landslides in early June 2025 marooned 1,500 tourists and blocked arterial roads due to incessant rain.

    What is the Dual Monsoon Pattern? 

    Dual Monsoon Pattern refers to the occurrence of two distinct monsoon phases in a year that affect a region, particularly the Northeastern States of India. These are:

    • Southwest Monsoon (June to September):
      This is the primary monsoon season for most of India. The Bay of Bengal branch of the southwest monsoon brings heavy rainfall to the Northeastern States like Assam, Meghalaya, and Arunachal Pradesh.
    • Retreating/Post-Monsoon (October to December):
      This secondary phase brings additional rainfall, especially to Nagaland, Manipur, Mizoram, and Tripura (NMMT region). This is often accompanied by cyclonic storms originating from the Bay of Bengal.

    How does the dual monsoon pattern affect the disaster preparedness of northeastern States?

    • Extended Vulnerability Period: The presence of both the southwest monsoon (June–September) and the retreating/post-monsoon (October–December) leads to a prolonged rainy season, increasing the duration for which states must stay alert and prepared. Eg: In 2023, flash floods affected parts of Meghalaya in both July and November, stretching disaster response capacities.
    • Recurring Strain on Resources: The back-to-back monsoon cycles put continuous pressure on relief infrastructure, emergency services, and budgetary resources, often without adequate recovery time between events. Eg: In Assam, flood shelters and boats used during June floods had to be reactivated again during October rains, delaying repairs and replenishment.
    • Challenges in Long-term Planning: The dual monsoon system makes it harder to plan and execute infrastructure repair, agricultural recovery, and resettlement efforts, as damage may recur within months. Eg: In Arunachal Pradesh, roads repaired after July landslides were again washed away during October rains in 2022, disrupting connectivity repeatedly.

    Why has infrastructure development lagged in the northeastern States compared to the rest of India?

    • Challenging Geographical Terrain: The region is dominated by mountainous landscapes, dense forests, and seismic zones, which make construction of roads, bridges, and railways technically difficult and cost-intensive. Eg: In Sikkim, frequent landslides and narrow mountain roads delay road-widening and highway projects.
    • Security and Strategic Concerns: The presence of international borders with countries like China, Myanmar, and Bangladesh and historical instances of insurgency have led to delays in project execution due to security concerns and administrative restrictions. Eg: The construction of the India-Myanmar-Thailand Trilateral Highway through Manipur has faced repeated delays due to local unrest and law-and-order issues.
    • Low Political and Economic Prioritisation: Compared to other regions, the Northeast has received less investment in infrastructure due to lower population density, limited industrial base, and less political influence at the national level. Eg: States like Nagaland and Mizoram have limited railway connectivity even today, unlike the rapid expansion seen in western and southern India.

    What are the steps taken by the Indian government? 

    • Strengthened Disaster Response and Early Warnings: The government has deployed NDRF units across the Northeast and enhanced IMD’s region-specific alerts for floods and landslides in states like Assam, Sikkim, and Arunachal Pradesh.
    • Infrastructure Development in Vulnerable Areas: Schemes like NESIDS support critical infrastructure such as flood protection embankments and all-weather roads in remote regions of Manipur and Mizoram.
    • Integration into National Disaster Management Frameworks: NDMA conducts capacity building, mock drills, and implements region-specific guidelines for urban flooding and landslide risk in cities like Gangtok and Guwahati.

    What long-term measures are needed to ensure sustainable disaster management in the Northeast? (Way forward)

    • Region-Specific Infrastructure Planning and Investment: Develop climate-resilient infrastructure suited to the region’s fragile ecology, such as landslide-resistant roads, flood-resistant housing, and robust early warning systems. Eg: The installation of a real-time flood monitoring system in the Brahmaputra basin has improved early evacuation in parts of Assam.
    • Integrated Inter-State and Central Coordination Mechanism: Establish a permanent regional disaster coordination body with participation from all Northeast states and the Centre to plan, share resources, and respond collectively to disasters. Eg: A joint task force involving Assam, Arunachal Pradesh, and Meghalaya could improve flood response across shared river systems like the Barak and Brahmaputra.

    Mains PYQ:

    [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 Bay of Bengal branch of the monsoon reaches the northeastern States first. These areas usually get a lot of rain during the monsoon, even in years when rainfall is lower than normal. Because of this, the region is naturally more prone to problems like flooding, which often comes with such heavy rain. 

  • What if China stops Brahmaputra Water? 

    Why in the News?

    Assam CM Himanta Biswa Sarma dismissed Pakistan’s claim about China blocking the Brahmaputra’s water as a baseless panic tactic with no scientific substance.

    Sarma’s Clarification on the Brahmaputra Issue:

    • Brahmaputra is an Indian river and not fully controlled by China.
    • Only about 30–35% of the river’s flow comes from China, mainly through glacial melt and rainfall on the Tibetan Plateau.
    • A major 65–70% of the river’s volume is generated within India, especially from monsoon rains and Indian tributaries.
    • He explained that the river’s flow increases from 2,000–3,000 cubic metres/second at the Indo-China border to 15,000–20,000 m³/s in Assam during the monsoon.
    • This proves that India plays a dominant role in sustaining the river, not China.
    • Even if China tried to restrict the river’s flow, it could help reduce annual floods in Assam that displace thousands of people.
    • He confirmed that China has never threatened to weaponize the Brahmaputra.

    About Brahmaputra River System:

    • The Brahmaputra River System is one of the major Himalayan drainage systems, along with the Ganga and Indus.
    • Stretch: It stretches over 2,900 kilometres, making it one of the longest rivers in Asia.
    • Origin: It originates in the Chemayungdung glacier in southwestern Tibet, where it is known as the Tsangpo River.
    • Catchment countries:
      • The river flows through Tibet, India (Arunachal Pradesh and Assam), and Bangladesh.
      • In Tibet, the river flows slowly with a wide, navigable channel for about 640 km.
      • Upon entering India through Arunachal Pradesh, it becomes the Dihang, and later merges with Lohit and Dibang rivers to be called the Brahmaputra.
      • In Bangladesh, it is called the Jamuna, which merges with the Ganga (Padma) and Meghna before flowing into the Bay of Bengal.
    • The world’s largest and smallest river islands, Majuli and Umananda, are located on the Brahmaputra in Assam.
    • Important Tributaries:
      • Left-bank tributaries: Lhasa, Nyang, Parlung Zangbo, Lohit, Dhanashri, Kolong
      • Right-bank tributaries: Kameng, Manas, Beki, Raidak, Jaldhaka, Teesta, Subansiri
    • States the River Flows Through in India: Arunachal Pradesh, Assam, Meghalaya, Nagaland, West Bengal, and Sikkim.
    • Major Cities on the River: Dibrugarh, Pasighat, Neamati, Tezpur, and Guwahati.
    • Major Hydel Projects:
      • Arunachal Pradesh: Subansiri, Kameng, Ranganadi, etc.
      • Assam: Kopili
      • Sikkim: Teesta, Rangit
      • Meghalaya, Nagaland, Manipur, Mizoram: Multiple local hydropower stations
    [UPSC 2016] With reference to the Brahmaputra River, which of the following is/are tributary/ tributaries of Brahmaputra?

    1. Dibang

    2. Kameng

    3. Lohit

    Select the correct answer using the code given below.

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

     

  • 600-million-year-old stromatolites in the Himalayas tell the story of an ocean lost and Earth’s first breath

    Why in the News?

    A huge 600-million-year-old group of stromatolites was found in Chambaghat, Himachal Pradesh, sparking new interest in India’s ancient rocks and the early history of life on Earth.

    What are Stromatolites?

    Stromatolites are layered, reef-like structures formed by ancient blue-green algae called cyanobacteria. These tiny microbes trapped and bound sediments in shallow seas, creating mineral mounds over millions of years. They are some of the oldest evidence of life on Earth.

    How do they contribute to understanding Earth’s early history?

    • Earliest Evidence of Life: Stromatolites, built by cyanobacteria over 3.5 billion years ago, are among the oldest records of life on Earth. Eg: Stromatolites in Australia date back to 3.6 billion years, showing microbial activity long before complex life existed.
    • Oxygen Production and Atmospheric Change: Cyanobacteria in stromatolites performed photosynthesis, releasing oxygen and leading to the Great Oxidation Event(~2.4 billion years ago). Eg: This oxygenation made the atmosphere suitable for the evolution of multicellular organisms.
    • Tectonic and Environmental Insights: Their presence in now-mountainous regions like Chambaghat in Himachal Pradesh, originally shallow seas, reveals tectonic shifts and lost oceans. Eg: The Chambaghat stromatolites formed in the Tethys Sea, later uplifted to the Himalayas by the collision of the Indian and Eurasian plates.

    Where was the recent significant stromatolite outcrop discovered? 

    A large outcrop was discovered in Chambaghat, Solan district, Himachal Pradesh. It is located in the pine-clad ridges at around 5,000–6,000 feet above sea level. It belongs to the Krol Group, sedimentary rocks formed in the ancient Tethys Sea.

    Why is it unique?

    • Large and Well-Preserved Outcrop: The Chambaghat site features an extensive hill covered with stromatolites, not just a few isolated samples. Eg: Unlike other Indian sites where stromatolites are scattered or small, Chambaghat has a whole hill full of these structures, making it exceptional in scale and preservation.
    • Relatively Young Stromatolites in a High-Altitude Location: These stromatolites date back about 600 million years and are found at an altitude of 5,000–6,000 feet above sea level. Eg: Their presence so high in the Himalayas tells a story of tectonic uplift, where ancient shallow marine depositswere pushed up from the Tethys Sea due to India’s collision with Eurasia.
    • Accessible and Visible Geological Heritage: The site is easily accessible and visible to researchers, locals, and tourists, making it a prime candidate for preservationand education. Eg: Many stromatolite sites in India are obscure or hard to reach, but Chambaghat offers a natural exhibit that could help raise public awareness about Earth’s early history.

    Why is there scientific disagreement about the importance of the Chambaghat stromatolites?

    • Not True Fossils but Biosedimentary Structures: Some scientists argue that stromatolites are organo-sedimentary structures, formed by trapped sediments and calcium carbonate, rather than preserved fossils of organisms. Eg: fossils are inaccurate because the original organisms are not preserved, only the structures formed by cyanobacteria.
    • Common and Widespread Geological Features: Stromatolites are found all over India and globally, so some experts feel the Chambaghat stromatolites are not a rare or unique discovery. Eg: The oldest stromatolites in India, like those in Dharwad, Karnataka (2,500 million years old), and worldwide (3.6 billion years old in Australia) are much older and more significant.
    • Not the Oldest or Most Unique Evidence of Life: While Chambaghat stromatolites are impressive, they are relatively young compared to other sites and not the earliest proof of life. Eg: Dr Arun Deep Ahluwalia notes that stromatolites in the Krol Belt are the youngest stromatolites, making them less important for studying the very earliest life forms.

    What is the significance of preserving stromatolite sites like Chambaghat? 

    • Educational and Scientific Value: Preserving stromatolite sites helps in studying Earth’s early life and geological history, providing valuable insights into how oxygenation of the atmosphere led to complex life. Eg: Chambaghat’s stromatolites can be used as an exhibit for students and researchers to understand the origin of life and ancient marine environments.
    • Cultural and Geoheritage Importance: Protecting these sites promotes public awareness and tourism, fostering a sense of pride and responsibility towards India’s unique geological heritage. Eg: Creating a Geoheritage Park at Chambaghat can engage locals, tourists, and schools, preserving the site while boosting local economy and education.

    Way forward: 

    • Formal Protection and Geoheritage Park Development: Declare Chambaghat stromatolite site a protected geological monument and develop it into a Geoheritage Park to ensure conservation, promote scientific research, and boost geo-tourism.
    • Public Awareness and Educational Outreach: Launch educational programs and community engagement initiatives involving schools, researchers, and local stakeholders to increase awareness about the site’s scientific and cultural significance.

    Mains PYQ:

    [UPSC 2021] What is Cryptocurrency? How does it affect global society? Has it been affecting Indian society also?

    Linkage: The growing importance of cryptocurrency, its disruptive potential in global finance, and its implications for India, specifically mentioning India’s significant number of crypto users. This PYQ demonstrates the UPSC’s interest in the fundamental understanding and societal effects of this technology.

  • Danger in the sea: On Kerala and the MSC Elsa 3 sinking

    Why in the News?

    The container ship MSC Elsa 3 sank off the coast of Kochi on May 24, triggering a major environmental and maritime safety crisis that could turn into one of India’s worst maritime pollution disasters.

    What led to the sinking of MSC Elsa 3?

    • Operational Failure at Sea: On May 24, MSC Elsa 3 began tilting off the coast of Kochi due to an unspecified operational problem. Despite attempts by the crew, the ship could not be stabilised.
    • Aging Vessel and Abandonment by Crew: Although structurally considered safe, the ship was nearly 30 years old. The crew abandoned it after unsuccessful efforts to right it, leading to its eventual sinking.
    • Unfavourable Sea Conditions: Monsoon-related rough weather worsened the situation, with containers dislodging and floating, further destabilising the vessel before it sank to a depth of 50 metres.

    Why are the sunken containers considered hazardous?

    • Reactive Chemicals: Some containers hold substances that react dangerously with water, posing immediate chemical and fire hazards. Eg: 12 containers had calcium carbide, which reacts with seawater to produce acetylene gas, a highly flammable and explosive compound.
    • Toxic Leakage: Leaked substances from damaged containers can pollute seawater and pose health hazards to marine life and humans. Eg: A container with rubber solution leaked and reacted with seawater, leading to the appearance of plastic pellets along the Kerala coast.
    • Long-Term Environmental Impact: Chemicals from sunken containers can gradually seep out, causing persistent marine pollution and ecological damage. Eg: If not retrieved, chemicals from these containers may enter the food chain, harming marine biodiversity and impacting fisheries.

    Who handles oil spill response in India?

    The Indian Coast Guard is the nodal agency under the National Oil Spill Disaster Contingency Plan (NOS-DCP).

    How does this incident test India’s maritime disaster readiness?

    • Inter-agency Coordination: Effective disaster response requires smooth coordination between multiple agencies such as the Coast Guard, pollution control boards, and port authorities. Eg: In the 2017 Chennai oil spill, response was delayed due to confusion and poor coordination, leading to severe coastal damage.
    • Emergency Response Infrastructure: The ability to quickly deploy salvage teams, pollution control equipment, and monitoring systems is essential. Eg: After MSC Elsa 3 sank, authorities had time to prepare, making it a critical test of India’s readiness to act swiftlybefore oil or chemicals leak.
    • Policy Implementation and Preparedness: Real-time implementation of national plans and compliance with international protocols demonstrate operational strength. Eg: The National Oil Spill Disaster Contingency Plan (NOS-DCP) designates the Coast Guard as the nodal agency, and this incident checks how well the plan is executed.

    What are the steps taken by the Indian Government? 

    • Activation of Nodal Agencies: The Indian Coast Guard has been designated as the nodal agency under the National Oil Spill Disaster Contingency Plan (NOS-DCP) to coordinate the response. Eg: In the MSC Elsa 3 case, the Coast Guard is actively engaged in monitoring oil leakage and coordinating salvage efforts.
    • Deployment of Salvage Operations: Salvage teams are being engaged following international insurance protocols to prevent further environmental damage. Eg: Authorities have mobilised professional salvers to safely retrieve containers and prevent hazardous leaks from the sunken ship.
    • Monitoring and Cleanup Measures: Environmental agencies have been tasked with identifying and addressing the pollution caused, including plastic pellets and chemical residues. Eg: The Kerala government is coordinating with central pollution control authorities to manage the shoreline impactand protect marine life.

    Way forward: 

    • Strengthen Maritime Hazard Protocols and Container Screening: India must enforce stricter pre-shipment screening of cargo for hazardous materials and mandate real-time tracking of containers carrying reactive or toxic substances.
    • Enhance Rapid Response Infrastructure and Inter-agency Coordination: Develop a unified maritime disaster response framework with clearly defined roles for all agencies — Coast Guard, pollution boards, port authorities, and state governments.

    Mains PYQ:

    [UPSC 2022] Discuss in detail the photochemical smog emphasizing its formation, effects and mitigation. Explain the 1999 Gothenburg Protocol.

    Linkage: The MSC Elsa 3 incident directly involves environmental pollution, specifically marine pollution from hazardous cargo and fuel oil, necessitating mitigation efforts. This question reflects the UPSC’s interest in environmental pollution issues.

  • Places in news: Mt. Khangchendzonga

    Why in the News?

    Sikkim’s CM has asked the Centre to ban climbing on Mt. Khangchendzonga, even from the Nepal side, as the mountain is sacred to the Sikkimese and seen as a guardian deity.

    About Mt. Khangchendzonga:

    • Location: Mt. Khangchendzonga is the third-highest mountain in the world at 8,586 metres, located on the India-Nepal border in the eastern Himalayas.
    • Major Glaciers and Rivers: It is surrounded by Zemu, Talung, Yalung, and Kanchenjunga glaciers and bordered by rivers like Tamur, Lhonak, and Teesta.
    • Etymology: Known as the “Five Treasuries of the Great Snow”, due to its five towering peaks, all above 8,000 metres.
    • Geological Age: The mountain rocks are between 445 million to 1 billion years old, from the Neoproterozoic to Ordovician periods.
    • Ecological Zone: Located within Khangchendzonga National Park, a UNESCO World Heritage Site, rich in altitude diversity and rare species.
    • Wildlife and Ecosystems: Home to snow leopards, red pandas, musk deer, and Asiatic black bears, along with over 220 glacial-fed water bodies.
    • Hydrological Importance: It is the highest point in the Brahmaputra basin, contributing water to both the Ganges and Kosi River systems.
    • Climate: Receives heavy monsoon snowfall and lighter winter snow.

    Religious and Cultural Significance:

    • Spiritual Status: The mountain is sacred in Sikkim and Nepal, embedded in local mythology and Buddhist traditions.
    • Symbolism of the Name: The “5 Treasuries” are believed to hold salt, gold, turquoise, sacred texts, grain, medicine, and other treasures.
    • Guardian Deity: It is considered the home of Dzoe-Nga, the chief protector deity of Sikkim, known as Pho-lha.
    • Mythological Roots: Local guardian deities were blessed by Guru Padmasambhava, the patron saint of Sikkim.
    • Climbing Ban: The Sikkim government banned climbing on the mountain in 1998 and 2001 under the Sacred Places of Worship Act, 1991, to preserve its sanctity.
    [UPSC 2024] Consider the following pairs:

    Peak: Mountains

    1. Namcha Barwa — Garhwal Himalaya

    2. Nanda Devi — Kumaon Himalaya

    3. Nokrek — Sikkim Himalaya

    Which of the pairs given above is/are correctly matched?

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

     

  • Bow Echo Storms

    Why in the News?

    New Delhi recently faced a severe thunderstorm with winds up to 100 kmph, forming a bow echo — a crescent-shaped pattern seen on weather radar.

    About Bow Echo:

    • What is it: A bow echo is a storm pattern on radar that looks like a curved bow, similar to an archer’s bow.
    • Storm Type: It forms inside a mesoscale convective system (MCS) — a large group of organised thunderstorms.
    • Origin of Term: The term was first used by Ted Fujita, who also created the Fujita scale for tornadoes.
    • How It Forms:
      • Heavy rain causes cool air to sink and spread out near the ground.
      • This cool air forms a gust front, which pushes warm, moist air upward, creating new storms.
      • A rear inflow jet — strong mid-level winds — pushes the storm forward, bending it into a bow shape.
      • Bookend vortices may form at both ends of the bow, and the northern end can sometimes generate tornadoes.

    Size, Impact, and Dangers:

    • Size and Duration: Bow echoes usually span 20 to 200 km and last 3 to 6 hours.
    • Wind Strength: They often produce straight-line winds over 100 km/h, like those seen in Delhi’s recent storm.
    • Derechos: In severe cases, bow echoes can grow into derechos, which are long-lasting and widespread windstorms.
    • Impacts:
      • Damaging Winds: Knock down trees, power lines, and damage buildings.
      • Brief Tornadoes: May form at the storm’s edges, especially at the northern end.
      • Microbursts and Downbursts: Intense short-lived wind blasts within the storm that cause local destruction.
    [UPSC 2013] During a thunderstorm, the thunder in the skies is produced by the-

    1. Meeting of cumulonimbus clouds in the sky 2. Lightning that separates the nimbus clouds 3. Violent upward movement of air and water particles.

    Select the correct answer using the codes given below.

    Options: (a) 1 only (b) 2 and 3 (c) 1 and 3 (d) None of the above produces the thunder*

     

  • What is Madden-Julian Oscillation (MJO)?

    Why in the News?

    Mumbai got heavy monsoon rains two weeks early because of a strong Madden-Julian Oscillation (MJO) — a weather pattern that boosts rainfall in the region.

    About the Madden-Julian Oscillation (MJO):

    • Definition: The MJO is a moving weather system of clouds, wind, rain, and pressure that travels eastward around the tropics.
    • Cycle Time: It takes 30 to 60 days to complete a full loop around the globe.
    • Discovery: It was discovered in the 1970s by Roland Madden and Paul Julian.
    • Two Phases:
      1. The enhanced convective phase brings heavy rain, storms, and clouds.
      2. The suppressed convective phase brings dry, clear weather.
    • Global Pattern: These phases move together — when one area gets rain, another gets dry weather.
    • MJO vs ENSO: Unlike El Niño, which lasts for months, the MJO changes every few weeks and affects short-term weather patterns.
    • Wider Impact: It influences monsoons, cyclones, jet streams, and weather in both tropical and non-tropical regions.
    • Phases: Scientists divide its movement into 8 phases, each showing where rain or dry weather will occur.

    MJO and the Early Monsoon of 2025:

    • Early Monsoon Trigger: The early arrival of the monsoon in May 2025 was largely due to a very active MJO.
    • IMD Observation: The India Meteorological Department noted that the MJO was in Phase 4 with high amplitude, which strongly affects Indian rainfall.
    • Rapid Monsoon Progress: It helped push extra moisture and clouds from the Indian Ocean, making the monsoon move from Kerala to Maharashtra in just two days.
    • Other Contributing Factors:
      • A strong cross-equatorial flow brought warm, moist air from the south.
      • A low-pressure system in the Arabian Sea brought pre-monsoon rains to Mumbai.
    • Record Rainfall: This resulted in Mumbai’s wettest May in over 100 years.
    • Why It Matters: The event showed how a tropical system like the MJO can suddenly change monsoon timing and rainfall patterns in India.
    [UPSC 2017] With reference to ‘Indian Ocean Dipole (IOD)’ sometimes mentioned in the news while forecasting Indian monsoon, which of the following statements is/are correct?

    1. IOD phenomenon is characterized by a difference in sea surface temperature between tropical Western Indian Ocean and tropical Eastern Pacific Ocean.

    2. An IOD phenomenon can influence an El Nino’s impact on the monsoon.

    Options: (a) 1 only (b) 2 only* (c) Both 1 and 2 (d) Neither 1 nor 2

     

  • [27th May 2025] The Hindu Op-ed: Focus on heat-resilience despite the monsoon

     

    PYQ Relevance:

    [UPSC 2024] What is disaster resilience? How is it determined? Describe various elements of a resilience framework. Also mention the global targets of the Sendai Framework for Disaster Risk Reduction (2015- 2030).

    Linkage: The heat health crisis falls under the broader domain of disaster risk reduction and building resilience, especially considering extreme heat events as climate-induced disasters. It prompts discussion on defining resilience and the frameworks needed, aligning with the call for embedding heat resilience into public health systems.

     

    Mentor’s Comment: India is going through a serious climate-health crisis as rising temperatures and frequent heatwaves put more pressure on the already stretched public health system. At the recent national conference “India 2047: Building a Climate-Resilient Future,” experts shared not only scientific facts like wet-bulb temperatures but also the real-life struggles of informal workers. This showed how heat stress and social inequality are closely linked. The conference highlighted the need to move beyond isolated emergency care and take united, cross-sector, and fair action to build climate resilience into the way we manage public health.

    Today’s editorial discusses the  serious climate-health crisis as rising temperatures and frequent heatwaves. This content would help in GS Paper II ( Governance & Health Sector) and GS Paper III (Climate change impact).

    _

    Let’s learn!

    Why in the News?

    As extreme weather increases, we need to move from only treating emergencies to preventing problems by focusing on fair and caring public health.

    Why is linking weather alerts with health systems crucial?

    • Enables Timely Preventive Action: Early warning systems allow health workers to prepare and respond before heatwaves lead to medical emergencies. Eg: In Ahmedabad, heat alerts trigger distribution of hydration kits and public advisories, reducing heatstrokecases.
    • Strengthens Community-Level Response: Alerts shared through ASHA workers or local networks can activate door-to-door checks, especially for the elderly and chronically ill. Eg: ASHAs sending WhatsApp messages and visiting vulnerable residents during red alerts.
    • Reduces Burden on Emergency Healthcare: By preventing illness through early interventions (like avoiding midday work, increasing hydration), the pressure on hospitals and emergency services is reduced. Eg: Pre-monsoon planning with meteorological inputs helps health centers stock cooling kits and prepare treatment spaces.

    What is the impact of extreme heat on India’s public health?

    • Rise in Heat-related Illnesses and Deaths: Extreme heat leads to heatstroke, dehydration, and worsens heart and kidney conditions. Eg: According to the National Centre for Disease Control (NCDC), over 25,000 heat-related deaths were recorded in India between 1992 and 2020.
    • Overburdened Healthcare Infrastructure: Hospitals face a surge in emergency cases during heatwaves, straining limited resources. Eg: During the 2022 heatwave, Delhi’s Lok Nayak Hospital reported a 30% increase in patients with heat-related symptoms in just a week.

    How does extreme heat act as a “social injustice multiplier”?

    • Greater Risk to Vulnerable Populations: Outdoor workers, elderly, and slum dwellers suffer disproportionately due to poor shelter and exposure. Eg: A study by the Indian Institute of Public Health (Ahmedabad) found construction workers had a 2.5 times higher risk of heat illness compared to the general population during peak summer.
    • Limited adaptive capacity: Daily wage workers, street vendors, and waste pickers cannot afford to stop working during heatwaves, making them more vulnerable to heat stress and illness. Eg: Construction workers under tin roofs suffer intense heat but have no choice but to continue working.
    • Excludes the marginalised from public guidance: Advice like “stay indoors” or “avoid exertion” is often irrelevant to those who lack shelter, depend on outdoor jobs, or live in overcrowded spaces, highlighting deep systemic inequalities. Eg: A homeless person or a street vendor cannot follow “stay indoors” guidance during a red alert.

    Who can act as frontline heat-safety champions?

    • ASHA Workers and Primary Health Workers: Trained Accredited Social Health Activists (ASHAs) and staff at Primary Health Centres (PHCs) are well-placed to spread awareness, monitor vulnerable groups, and respond early to heat-related illnesses. Eg: An ASHA worker in a rural village sends heat alerts via WhatsApp and conducts door-to-door visits during a heatwave.
    • Health and Wellness Centre Staff: Staff at Health and Wellness Centres can play a key role in educating communities, distributing hydration kits, and advising on preventive measures like staying hydrated and avoiding midday sun. Eg: A nurse at a wellness centre trains local youth on recognizing signs of heat stress and first-aid response.

    What are the steps taken by the Indian Government? 

    • Development of Heat Action Plans (HAPs): The government, in collaboration with local bodies and NGOs, has promoted city-level Heat Action Plans to reduce heat-related mortality through early warnings, public awareness, and cooling strategies. Eg: The Ahmedabad Heat Action Plan (2013) includes early warning systems, public cool spaces, and training for health workers.
    • Integration with Meteorological Services: India Meteorological Department (IMD) provides heat alerts, which are increasingly being integrated into local health response systems to trigger preventive action. Eg: Heat alerts in Odisha are linked to ASHA worker messaging and hydration kit distribution before peak summer.
    • Policy Push for Climate-Resilient Health Systems: The National Action Plan on Climate Change and Human Health (NAPCCHH) encourages health systems to be climate-ready by building infrastructure, developing clinical protocols, and training staff. Eg: Health ministries now issue advisories on heat stress, including guidance on modifying medication for chronic patients during heatwaves.

    What preventive steps can make India’s health system heat-resilient? (Way forward)

    • Strengthening Primary Health Infrastructure: Equip primary health centres, Health & Wellness Centres, and ASHA workers with training and protocols to identify and respond to heat-related illnesses. Eg: Trained ASHA workers in rural Gujarat conduct door-to-door checks during heat alerts and share hydration tips via WhatsApp groups.
    • Integrating Heat Risk into Chronic Disease Care: Clinicians should adjust medications, provide heat safety counselling, and track high-risk patients like those with heart or kidney conditions during summer. Eg: In Delhi, doctors monitor diabetic patients more closely during red alerts and advise them on avoiding midday exposure.
    • Standardising Clinical Protocols for Heat Illness: Create and implement national clinical guidelines for diagnosing and treating heatstroke and heat stress, including summer drills and heat corners in hospitals. Eg: Rajasthan hospitals now stock cooling kits and have designated heat response units during summer months.

  • What is Magnetic Flip-Flop?

    Why in the News?

    In 2024, a soundtrack was released inspired by the Laschamps event, a magnetic flip-flop that occurred 41,000 years ago when Earth’s magnetic field weakened to just 5% and the poles briefly reversed.

    What is Magnetic Flip-Flop?

    • Definition: A magnetic flip-flop is when Earth’s magnetic poles reverse, with the north and south poles switching places.
    • Magnetic Field Source: Earth’s magnetic field is generated by the movement of molten iron in the outer core, acting like a giant magnet.
    • Reversal Types:
      • A long-term change is called a geomagnetic reversal.
      • A short-lived, temporary switch is a geomagnetic excursion.
    • Field Behavior: During a reversal, the magnetic field weakens significantly and the direction of field lines flips.
    • Occurrence: These events are irregular and unpredictable.

    Recent Magnetic Reversals and Excursions:

    • Last Major Reversal: The Brunhes–Matuyama reversal occurred about 780,000 years ago.
    • Known Excursions:
      • Norwegian-Greenland Sea event (~64,500 years ago)
      • Laschamps excursion (~41,000 years ago), when field strength dropped to 5% of today’s level
      • Mono Lake excursion (~34,500 years ago)
    • Indian Evidence: Excursions found in Uttarakhand (Bagwalipokar), dated to 15,500–14,700 years and 8,000–2,850 years ago.
    • Pole Movement: Since 1831, the north magnetic pole has shifted 1,100 km toward Siberia and now moves at 35 km/year, while the south pole is more stable.

    Implications of Magnetic Flip-Flop:

    • Radiation Exposure: A weaker magnetic field during flip-flop allows more cosmic radiation, affecting:
      • Satellites and astronauts
      • Navigation and communication systems
      • Power grids and electronics
    • Protective Shield: Earth’s atmosphere still protects against harmful radiation even when the magnetic field is weak.
    • Climate & Ozone Effects: Events like Laschamps may have altered the ozone layer and climate, but no confirmed link to mass extinctions.
    • South Atlantic Anomaly: A current weak-field region affecting spacecraft over South America and South Africa.
    • Monitoring Tools: Scientists use satellites, ice cores, volcanic rocks, and geomagnetic observatories to track field changes.
    • Global Guidance: The World Magnetic Model, updated every 5 years, supports navigation systems worldwide.
    • Prediction Outlook: Though timing of future reversals is uncertain, computer models and cosmic data are improving forecasts.
    [UPSC 2017] Consider the following statements:

    1. The Earth’s magnetic field has reversed every few hundred thousand years.

    2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide.

    3. When living organisms originated, they modified the early atmosphere of the Earth.

    Which of the statements given above is/are correct?

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

     

  • [26th May 2025] The Hindu Op-ed: The maths of how India’s coastline lengthened without gaining land

    PYQ Relevance:

    [UPSC 2023] Comment on the resource potentials of the long coastline of India and highlight the status of natural hazard preparedness in these areas.

    Linkage: India’s geography and physical features, like its coastlines, are often discussed in terms of resources and natural hazards. This question is relevant as it pertains to India’s coastline and is categorized under the Geography subject in GS1.

     

    Mentor’s Comment: In December 2024, the Union Ministry of Home Affairs revised India’s coastline length from 7,516.6 km to 11,098.8 km, not due to any geographical change, but because of the use of advanced cartographic tools and improved measurement techniques. This revision, made nearly 50 years after the original measurement in the 1970s, demonstrates the coastline paradox — the idea that coastline length increases with more detailed measurement scales. The update has significant implications for maritime security, disaster preparedness, and exclusive economic zone delineation, showcasing how technology redefines our geographic understanding.

    Today’s editorial discusses the updated length of India’s coastline and its effects. This information is useful for GS Paper I (Geography), GS Paper II (Policy Making), and GS Paper III (Environment & Disaster Management).

    _

    Let’s learn!

    Why in the News?

    The Ministry of Home Affairs updated India’s coastline length to 11,099 km in its 2023–24 report, increasing it from the earlier measurement of 7,516.6 km.

    What caused the increase in India’s coastline length?

    • Use of High-Resolution Mapping Techniques: Earlier measurements (1970s) used low-resolution maps (1:4,500,000), missing finer features. The updated 2024 figure uses high-resolution charts (1:250,000), capturing detailed coastal geometry. Eg: Narrow tidal creeks and sandbars that were previously omitted are now included.
      • Features like estuaries, tidal flats, coastal ridges, and inlets are now accurately mapped. Eg: Island groups like Andaman & Nicobar and Lakshadweep, which were inadequately covered earlier, are now comprehensively included.

    Why is it hard to measure coastlines accurately?

    • Coastline Paradox (Dependence on Scale of Measurement): The measured length of a coastline changes based on the size of the measuring unit (“ruler”). Eg: Using a 200-km ruler smooths over small curves, but a 1-km ruler captures every inlet and estuary, increasing total length.
    • Irregular and Dynamic Coastal Features: Coastlines are shaped by natural features like creeks, deltas, estuaries, and shifting sediments, which are not fixed. Eg: River mouths may change shape over time due to erosion or sediment deposition, making boundaries unclear.
    • Influence of Tides and Sea-Level Changes: High and low tides alter visible land boundaries, affecting measurements at different times. Eg: Areas that are exposed during low tide but submerged at high tide (like mudflats) may or may not be counted depending on timing.

    Which tools were used to update the measurement?

    • Electronic Navigation Charts (ENCs): Provided detailed and accurate mapping at a finer scale (1:250,000). Eg: These charts helped capture small features like estuaries and creeks which were missed in older maps (1:4,500,000 scale).
    • Geographic Information Systems (GIS): Enabled spatial analysis and integration of various data layers for precise mapping. Eg: GIS combined data from satellites, surveys, and field measurements to create a more accurate coastline outline.
    • LIDAR-GPS and Satellite-Based Imaging: Laser-based LIDAR and GPS were used for high-resolution topographic mapping. Eg: Drones and satellite altimetry helped detect elevation and shoreline changes, especially in island regions like Andaman & Nicobar.

    How does the revised coastline length impact India’s maritime security and disaster preparedness?

    • Enhanced Maritime Surveillance and Border Security: A longer coastline means more area to monitor for smuggling, infiltration, and illegal fishing. Eg: The Indian Coast Guard may need more outposts, vessels, and patrol routes to guard the extended 11,099.8 km coastline.
    • Expansion of Exclusive Economic Zone (EEZ): The increased length helps in demarcating a wider EEZ, enabling better control over marine resources. Eg: India can assert rights over fisheries, oil, and gas exploration in a broader sea area.
    • Improved Disaster Preparedness and Early Warning: Better understanding of coastal geography aids in creating precise models for cyclones, tsunamis, and storm surges. Eg: Coastal States like Odisha and Tamil Nadu can now develop more accurate evacuation and shelter plans.
    • Refined Coastal Regulation and Zoning: Accurate coastline data supports zoning laws to restrict construction in vulnerable areas. Eg: Authorities can update Coastal Regulation Zone (CRZ) norms to better safeguard ecosystems and infrastructure.
    • Better Climate Resilience and Adaptation Planning: Updated coastline measurements help assess vulnerability to sea-level rise and erosion. Eg: Low-lying areas in Kerala and island regions like Lakshadweep can be prioritized for climate adaptation projects.

    What are the resource potentials of the long coastline of India?

    • Fisheries and Marine Biodiversity: India’s coastline supports a vast fishing industry, providing employment and food security. Eg: States like Gujarat and Tamil Nadu have thriving marine fishing sectors contributing to exports and coastal livelihoods.
    • Port Infrastructure and Trade: The long coastline facilitates maritime trade through major and minor ports. Eg: Ports like Mumbai, Chennai, and Visakhapatnam are crucial for imports, exports, and shipping connectivity under the Sagarmala Project.
    • Offshore Energy Resources: Coastal waters have potential for oil, natural gas, and renewable energy like offshore wind and tidal energy. Eg: Mumbai High is a major offshore oil field, while Gujarat and Tamil Nadu are exploring offshore wind energy projects.
    • Tourism and Blue Economy Development: Scenic beaches, islands, and marine ecosystems attract tourism and support the blue economy. Eg: Goa’s coastal tourism and the Andaman & Nicobar Islands’ ecotourism contribute significantly to local economies.
    • Aquaculture and Coastal Agriculture: Coastal zones are suitable for shrimp farming, seaweed cultivation, and salt production. Eg: Andhra Pradesh and West Bengal have developed large-scale shrimp aquaculture for domestic and export markets.

    What is the status of natural hazard preparedness in the coastal Area?

    • Improved Early Warning Systems: India has strengthened early warning capabilities for cyclones and tsunamis through institutions like the Indian National Centre for Ocean Information Services (INCOIS) and IMD. Eg: The Odisha government’s timely evacuation during Cyclone Fani (2019) saved thousands of lives.
    • Development of Coastal Infrastructure and Shelters: Construction of cyclone-resistant shelters, embankments, and flood control systems has improved disaster resilience. Eg: The National Cyclone Risk Mitigation Project (NCRMP) has led to the building of multi-purpose cyclone shelters in vulnerable states like Andhra Pradesh and West Bengal.
    • Community Awareness and Disaster Drills: Government and NGOs have promoted community-based disaster preparedness, training locals in evacuation procedures and first aid. Eg: Regular mock drills in coastal villages of Tamil Nadu and Kerala help improve response readiness.

    Way forward: 

    • Integrated Coastal Zone Management (ICZM) Expansion:Strengthen ICZM plans across all coastal states with real-time monitoring, climate-resilient infrastructure, and ecosystem-based approaches. Eg: Expand initiatives like ICZM Phase II to include mangrove restoration, sustainable livelihoods, and coastal erosion control in states like Kerala and Goa.
    • Technology-Driven Risk Mapping and Community-Centric Planning: Deploy AI-powered hazard models, geospatial mapping, and mobile-based alert systems to ensure last-mile connectivity. Eg: Use drone mapping for vulnerable areas in the Sundarbans, and integrate local communities into planning via participatory risk assessments.