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Subject: Climate Change

1. Global Warming and Issues
2. All about Pollution

  • Why Uttarakhand govt wants to evaluate the risk of Glacial Lake Outburst Floods

    Why in the news? 

    Recently, the Uttarakhand government has constituted two teams of experts to evaluate the risk posed by five potentially hazardous glacial lakes in the region.

    Context:

    • The Hazardous Glacial Lakes are prone to Glacial Lake Outburst Floods (GLOFs), the kind of events that have resulted in several disasters in the Himalayan states in recent years.
    • The National Disaster Management Authority (NDMA), which operates under the Union Ministry of Home Affairs, has identified 188 glacial lakes in the Himalayan states that can potentially be breached because of heavy rainfall. Thirteen of them are in Uttarakhand.

    About Glacial Lake Outburst Floods (GLOFs):

    GLOFs are disaster events caused by the abrupt discharge of water from glacial lakes  large bodies of water that sit in front of, on top of, or beneath a melting glacier. As a glacier withdraws, it leaves behind a depression that gets filled with meltwater, thereby forming a lake. Example: 4 october 2023 GLOFs in Sikkim.

    Factors behind the GLOFs:

    • Avalanches or Landslides: Incidents such as avalanches or landslides can also impact the stability of the boundary around a glacial lake, leading to its failure, and the rapid discharge of water.
    • Due to climate change: Rising surface temperatures across the globe, including India, have increased the risk of GLOFs. Studies have shown that around 15 million people face the risk of sudden and deadly flooding from glacial lakes, which are expanding and rising in numbers due to global warming.
    • Rapid infrastructure development in vulnerable areas has also contributed to the spike in such incidents.
    • Sizable ice chunks in the lake: GLOFs can be triggered by various reasons, including glacial calving, where sizable ice chunks detach from the glacier into the lake, inducing sudden water displacement.

    Why are GLOFs under the spotlight?

    • Increased Frequency of GLOFs: Since 1980, GLOFs have become more frequent in the Himalayan region, particularly in southeastern Tibet and the China-Nepal border area. This indicates a concerning trend of glacial melting and lake formation as per Institute of Tibetan Plateau Research in China
    • Extent of Potential Risk: The analysis by  Institute of Tibetan Plateau Research in China suggests that approximately 6,353 sq km of land could be at risk from potential GLOFs.
    • Regional Impacts: Another analysis conducted by Caroline Taylor, Rachel Carr, Stuart Dunning (Newcastle University, UK), Tom Robinson (University of Canterbury, New Zealand), and Matthew Westoby (Northumbria University, UK) indicates that GLOFs are not just a localized issue but have broader regional impacts.
      • Around 3 million people in India and 2 million in Pakistan are identified as facing the risk of GLOFs, highlighting the potential humanitarian consequences of these events.

    What is the situation in Uttarakhand?

    • Past GLOF events: Uttarakhand has experienced two major GLOF events in recent years. The first occurred in June 2013, affecting large parts of the state, particularly the Kedarnath valley, resulting in significant loss of life.
      • The second event happened in February 2021 in Chamoli district, leading to flash floods due to the bursting of a glacier lake.
    • Categorization of Glacial Lakes: Uttarakhand has 13 glacial lakes categorized into three risk levels: ‘A’, ‘B’, and ‘C’.
      • Five highly sensitive lakes fall into the ‘A’ category, including Vasudhara Tal in the Dhauliganga basin (Chamoli district), Maban Lake, Pyungru Lake, and two unclassified lakes in Pithoragarh district.
    • Size and Elevation of High-Risk Lakes: The lakes in the ‘A’ category have areas ranging from 0.02 to 0.50 sq km and are situated at elevations between 4,351 to 4,868 meters above sea level. These characteristics make them particularly vulnerable to glacial lake outburst events.
    • Impact of Rising Temperatures: A 2021 study by the Potsdam Institute for Climate Research (PIK) and The Energy and Resources Institute (TERI) suggests that rising surface temperatures could worsen the situation in Uttarakhand.
      • The state’s annual average maximum temperature may increase by 1.6-1.9 degrees Celsius between 2021-2050, potentially exacerbating the risk of GLOFs.

    Conclusion: Uttarakhand government forms expert teams to assess risk from 5 hazardous glacial lakes prone to GLOFs. With rising temperatures and past disasters, urgent action is needed to mitigate potential catastrophic flooding.

  • Negative Leap Second: Climate Change’s Impact on Timekeeping

    Why in the news?

    • A recent publication in the science journal Nature highlights how climate change-induced melting of glaciers and ice sheets is altering the Earth’s rotation, potentially disrupting our timekeeping systems.
    • Leap seconds were added almost every year between 1972 and 1999 to adjust for Earth’s slowing rotation. But there have only been four added in the last 23 years, and the last time a leap second was added was in 2016.

    What is a Leap Second?

    • A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to synchronize atomic time with astronomical time, particularly with the Earth’s rotation.
    • The purpose of adding or subtracting a leap second is to keep International Atomic Time (IAT) (which is extremely precise) in close alignment with astronomical time, which is based on the Earth’s rotation and is subject to slight variations.

    There are two types of leap seconds:

    1. Positive Leap Second:
      • A positive leap second is added to UTC when the Earth’s rotation slows down slightly, causing the length of a day to exceed 86,400 seconds.
      • This type of leap second is necessary to bring UTC back into alignment with the Earth’s rotational time.
      • Positive leap seconds are rare and occur less frequently than negative leap seconds.
    2. Negative Leap Second:
      • A negative leap second, also known as a deletion or removal of a second, occurs when the Earth’s rotation speeds up slightly, causing the length of a day to be less than 86,400 seconds.
      • Negative leap seconds are extremely rare and have only been proposed but never implemented. They are considered hypothetical and have not yet been needed to adjust UTC.
      • The concept of negative leap seconds is controversial and requires international agreement and coordination among timekeeping organizations.

    International Atomic Time (TAI)

     

    • TAI is a high-precision time scale based on the weighted average of atomic clocks (usually involving caesium or rubidium atoms) from various laboratories around the world.
    • It is one of the primary time scales used for scientific and technical purposes, providing a continuous and uniform time reference that is independent of the Earth’s rotation.
    • TAI is maintained since 1958 by the International Bureau of Weights and Measures (BIPM) in Paris, France.
    • Unlike UTC, which is adjusted periodically to account for the Earth’s irregular rotation, TAI is a continuous time scale that does not include any corrections for Earth’s rotation.

     

    How Climate Change causes Negative Leap Second?

    •  Glacial Melting: Accelerating melt rates in Greenland and Antarctica are redistributing weight across the planet, causing a slight deceleration in the Earth’s rotation.
    • Historical Context: Timekeepers have periodically added leap seconds to clocks worldwide to account for the Earth spinning faster than usual, with 27 instances recorded since the 1970s.
    • Planned Adjustment: The proposed “negative leap second” adjustment, scheduled for 2026, may be postponed until 2029 or later due to the recent deceleration in the Earth’s rotation.Top of Form

    Practice MCQ:

    What is a Leap Second?

    (a) It is a periodic adjustment added to International Atomic Time (TAI) to compensate for irregularities in Earth’s rotation.

    (b) It is an extra second added to Coordinated Universal Time (UTC) to synchronize atomic time with astronomical time.

    (c) It is the time lag measured by the atomic clocks in Outer Space-Time conditions.

    (d) It is a term used to describe the synchronization of atomic clocks with the oscillations of subatomic particles.

  • How much should developed countries pay for climate action?

    Why in the news? 

    As the climate bomb ticks, Global Climate negotiators are working on a new global climate finance budget ahead of COP29 in Baku this November.
    • In 2009, developed countries committed to paying $100 bn every year. However, they failed to do so.

    Context:

    • The 2022 climate change conference (COP 28) held in Sharm el-Sheikh decided to establish a Loss and Damage Fund. 
    • These funds would work as a “transition away” from fossil fuels, and a promise to triple global renewable energy capacity by 2030.
    • On March 22, a two-day meeting was concluded in Copenhagen, Denmark, the first minister-level climate meeting for this year, and a ‘New Collective Quantitative Goal’ was finalized.

    What is the New Collective Quantitative Goal (NCQG)?

    • NCQG represents the yearly sum that developed countries must gather from 2025 onward to finance climate action in developing nations.
    • It has to be higher than the $100 billion that developed countries, collectively, had promised to raise every year from 2020, but had failed to deliver.

     

    Collective Funds need to ensure effective Climate Action:

    • UN Climate Change Report (2021): According to a report by UN Climate Change, developing countries would need approximately $6 trillion annually between 2021 and 2030 to implement their climate action plans.
    • Estimation in Sharm el-Sheikh Agreement: The final agreement at Sharm el-Sheikh included estimates suggesting that a global transition to a low-carbon economy could require about $4-6 trillion annually until 2050.
    • Global GDP Percentage: While these estimates vary, an approximate range of $5-7 trillion annually is suggested to effectively address climate change. This would require deploying about 5-7% of the global GDP towards climate action.
    • Renewable Energy Capacity: Meeting the target of tripling renewable energy capacity, as agreed in Dubai, is estimated to cost $30 trillion by 2030, according to the International Renewable Energy Association (IRENA).

    Prospects for a Realistic New Annual Climate Finance Target:

    • Current Funding Shortfall: The UNFCCC, responsible for organizing climate meetings and facilitating the implementation of climate agreements, is facing a severe shortage of funds. Its budget is currently less than half funded, which hampers its ability to fulfill its mandate effectively.
    • Call for Increased Climate Finance: There is a call for developed countries to commit to significantly higher levels of climate finance. India, for instance, has called for the New Collective Quantitative Goal (NCQG) to be set at least at $1 trillion per year 
    • Need of Innovative Funding Sources: Simon Stiell, Executive Secretary of UN Climate Change, emphasized the need for innovative funding sources to meet the substantial financial requirements for climate action.  
    • Dependence on Contributions: The UNFCCC relies heavily on contributions from countries and voluntary organizations to carry out its work. 

    How will this money be used?

    • On-time Delivery: Ensuring effective delivery of the new funding is essential for achieving meaningful impact.
    • Transparent and Inclusive Monitoring: Developing countries emphasize the need for a transparent and inclusive process to monitor and measure the agreed-upon amount.  
    • Distribution Across Needs: The new funding is distributed across different climate action areas such as mitigation, adaptation, and addressing loss and damage as per need 

    Conclusion: Developed countries must commit to higher climate finance, possibly $1 trillion annually, for effective action. Innovative funding sources and transparent monitoring are crucial for impactful distribution across climate action areas.

    Mains PYQs

    Q  Clean energy is the order of the day.’ Describe briefly India’s changing policy towards climate change in various international fora in the context of geopolitics.(UPSC IAS/2022)

    Q ‘Climate change’ is a global problem. How India will be affected by climate change? How Himalayan and coastal states of India will be affected by climate change? (UPSC IAS/2017)

     

  • Navigating the global Waterscape, its challenges

    Why in the news? 

    Today, March 22, 2024, is the 31st World Water Day, with the theme, “Leveraging water for peace”

    Context-

    • In the context of climate change-related pressures, the world also needs to foster improved cooperation over water-sharing
    • The global challenge for securing access to clean water persists for about two billion people and its demand keeps rising. Beyond threatening our basic human needs, this scarcity also risks our collective prosperity and peace.

    Water diplomacy in a time of extremities-

    • Climate Crisis Impact: Meteorological extremities like heat waves and floods exacerbate concerns about the climate crisis. In India, erratic monsoons affect agriculture, crucial for the $3 trillion economy.
    • Need for Improved Cooperation: Amid climate change pressures, fostering cooperation over water-sharing and embracing universal principles of International Water Law is imperative.
    • Water Diplomacy: Effective governance of shared waters and sustainable water use are essential for better water diplomacy, promoting peace and stability regionally and internationally.
    • Collaborative Governance: Collaborative governance ensures equitable water allocation among nations, fostering regional stability and peace.
    • Inclusive Approaches: Water diplomacy should include indigenous and local communities’ cross-border networks and involve civil society and academic networks to prevent, mitigate, and resolve water-related disputes.
    • Water Quality Data Shortage: There’s a general shortage of water quality data globally, with a significant urban-rural divide, highlighting the need for better access to basic drinking water services, particularly in rural areas.

    Addressing rural India’s needs-

    70% of India’s rural population relies on water for household activities, with agriculture being the primary livelihood source. Globally, agriculture accounts for 70% of freshwater use.

    • Water Accessibility: Improved water accessibility in rural areas can lead to positive outcomes in health, education, employment, and basic human needs and dignity.
    • Water Investments: Increased water investments in rural areas can yield positive outcomes across various sectors, benefiting communities in multiple ways.
    • AI Technology in Agriculture: The efficient use of emerging artificial intelligence (AI) technology in agriculture can aid in water conservation efforts. AI can help tackle crop and food loss, minimize chemical and fertilizer usage, and optimize water usage for sustainable and productive outputs.

    The issue of transboundary waters

    • Water Pollution: Transboundary rivers like the Meghna, Brahmaputra, Ganga, and Indus are experiencing worsening water pollution, posing significant environmental and health risks to communities relying on these water sources.
    • Lack of Governance: There is a need for sophisticated cross-border water governance to address issues related to equitable water allocation, pollution control, and sustainable management of shared water resources among neighboring countries.
    • Cooperation Challenges: Despite the importance of transboundary water cooperation, many countries face challenges in reaching agreements and implementing effective mechanisms for managing shared water resources. Disputes over water usage, infrastructure development, and environmental impacts hinder cooperation efforts.
    • Sustainable Development Goals (SDGs): Transboundary water management is crucial for achieving the SDGs, particularly Goal 6 (Clean Water and Sanitation). However, inadequate cooperation and governance frameworks pose obstacles to fulfilling SDG targets related to water security, environmental sustainability, and poverty alleviation.
    • Peace and Security: Scarcity of freshwater in transboundary river basins can exacerbate tensions and conflicts among riparian states. Effective management and cooperation on shared water resources are essential for promoting regional stability and preventing water-related conflicts.
    • Ecosystem Services: Transboundary rivers support diverse ecosystems and provide essential ecosystem services such as water purification, habitat for biodiversity, and regulation of water flow. Pollution and overexploitation of these waters threaten the integrity of ecosystems and the services they provide.
    • Climate Change Impacts: Climate change exacerbates challenges related to transboundary water management by altering precipitation patterns, increasing the frequency and intensity of extreme weather events, and affecting water availability and quality. Adaptation and resilience-building measures are needed to address climate-related risks in transboundary river basins.

    Suggestive Measures to Resolve Transboundary Water Issues:

    • Strengthen Governance Structures: Establish comprehensive cross-border water governance frameworks, including bilateral or multilateral agreements, to facilitate equitable water allocation, pollution control, and sustainable management of shared water resources.
    • Enhance Cooperation Mechanisms: Foster dialogue and collaboration among riparian states through platforms such as joint commissions, river basin organizations, and diplomatic negotiations to address disputes and promote mutual understanding of water management challenges.
    • Implement Integrated Water Resource Management (IWRM): Adopt IWRM approaches that consider social, economic, and environmental factors to promote sustainable development and ensure the efficient use of transboundary water resources while minimizing negative impacts on ecosystems and communities.
    • Enhance Monitoring and Data Sharing: Improve monitoring systems and data-sharing mechanisms to assess water quality, quantity, and usage trends in transboundary river basins. Enhanced transparency and information exchange can facilitate informed decision-making and cooperation among riparian states.
    • Promote Community Engagement: Involve local communities, indigenous groups, and civil society organizations in decision-making processes related to transboundary water management. Empowering stakeholders at the grassroots level can enhance accountability, foster cooperation, and promote sustainable practices.
    • Strengthen Legal Frameworks: Develop and enforce robust legal frameworks at national and international levels to regulate transboundary water resources effectively. Clear and enforceable laws can provide a basis for resolving disputes and ensuring compliance with agreed-upon water management principles.
    • Build Climate Resilience: Implement adaptation measures to address climate change impacts on transboundary water resources, such as enhancing water storage infrastructure, promoting water-efficient technologies, and integrating climate resilience into water management strategies.

    Conclusion-

    Navigating the global waterscape’s challenges requires robust governance, enhanced cooperation, and sustainable practices. By addressing transboundary water issues collectively, we can promote peace, ensure water security, and achieve sustainable development goals.

    Mains PYQ-

    Q- The interlinking of rivers can provide viable solutions to the multi-dimensional inter-related problems of droughts, floods, and interrupted navigation. Critically examine. (UPSC IAS/2020)

  • The problem of equity in IPCC reports | Explained

    Why in the news?

    In a study published on March 4, researchers analyzed more than 500 future emissions scenarios the UN Intergovernmental Panel on Climate Change (IPCC) assessed in its latest reports.

    Context-

    • These scenarios relate to mitigation actions like reducing carbon dioxide emissions from burning fossil fuels and increasing carbon sequestration through forestry.
    • It found that across all 556 scenarios, income, energy use, and emissions disparities between developed and developing countries are projected to continue up to 2050.

    What are IPCC assessment reports?

    • The IPCC’s Seventh Assessment Cycle (AR7) includes three Working Group reports covering physical science, climate adaptation, and mitigation action, along with a synthesis report consolidating their findings.
    • Thematic special reports are also issued, all aimed at assessing climate-related scientific literature to provide comprehensive knowledge on climate change.

    How does it assess future scenarios?

    • Modeled Pathways: The IPCC utilizes “modeled pathways” to estimate the measures necessary to limit the warming of the Earth’s surface. These pathways are constructed using Integrated Assessment Models (IAMs), which analyze human and earth systems.
    • Integrated Assessment Models (IAMs): IAMs are sophisticated models that encompass various disciplines, including macroeconomics, energy, vegetation, and earth systems. They provide insights into potential futures of the energy and climate system, as well as economies.
    • Components of IAMs: IAMs include macroeconomic models that forecast GDP growth, energy models that project consumption patterns, vegetation models that assess land-use changes, and earth-system models that predict climate evolution based on physical laws.
    • Policy-Relevant Guidelines: IAMs aim to offer policy-relevant guidance on climate action by integrating insights from diverse disciplines. They help policymakers understand the potential implications of various mitigation strategies and inform decision-making processes.
    • Shortcomings of IAMs: Despite their usefulness, IAMs have limitations. They primarily prioritize least-cost assessments, which may not adequately address equity concerns. For example, the cost of implementing climate mitigation measures varies across countries and regions.
    • Equitable Burden Sharing: Experts suggest that IAMs could be modified to enable countries to equitably share the burden of climate action. This approach could involve wealthier nations undertaking more substantial mitigation efforts, considering their greater capacity to bear the costs.
    • Global Cooperation: Addressing climate change requires global cooperation and equitable distribution of responsibilities. IAMs can play a crucial role in informing international climate negotiations and agreements by providing insights into the potential impacts of different policy scenarios.

    What did the new study find?

    • Projection of Inequities in GDP: The scenarios indicate that per-capita GDP in regions such as Sub-Saharan Africa, South Asia, West Asia, and the rest of Asia will remain below the global average even by 2050. These regions collectively represent 60% of the world’s population.
    • Inequities in Consumption and Energy Use: The study identifies disparities between the Global North and the Global South in terms of consumption of goods and services, as well as energy and fossil fuel consumption.
    • Carbon Sequestration and Mitigation Burden: Developing countries are projected to have higher carbon sequestration from land-based carbon sinks (e.g., forests) and greater deployment of carbon capture and storage (CCS) technologies compared to developed countries. This indicates that poorer countries would bear the burden of both mitigation action and carbon dioxide removal.
    • Disregard for Historical Responsibility: The study highlights that the scenarios disregard the historical responsibility of the Global North in contributing to climate change.
    • Neglect of Future Energy Needs: The scenarios also overlook the future energy requirements of the Global South to achieve development goals, indicating a lack of consideration for the development needs of these regions in the models.

    Why does equity matter?

    • Principles of Equity and Common but Differentiated Responsibilities (CBDR): Enshrined in the UN Framework Convention on Climate Change (UNFCCC), these principles emphasize that climate action should be guided by equity and recognize the differing responsibilities and capabilities of countries.
    • Article 3 of UNFCCC: Article 3 underscores the obligation to protect the climate system for the benefit of present and future generations based on equity and common but differentiated responsibilities. Developed countries are urged to take the lead in combating climate change.
    • Differential Responsibilities: The principles acknowledge that while addressing climate change is a global imperative, developed nations, being wealthier and more technologically advanced, should bear a greater burden of climate action compared to developing nations.
    • Equity Considerations in Climate Action: Researchers argue that mitigation pathways modeled using Integrated Assessment Models (IAMs) often neglect equity considerations. These models may not align with the principle of equity, as they may not prioritize the responsibility of developed regions to accelerate towards net negative emissions and support less developed regions.
    • Contradictory Scenarios: Despite the principles of equity and CBDR, the scenarios projected by IAMs may indicate the opposite, with developed regions not accelerating towards net negative emissions and potentially exacerbating global inequalities in climate action.
    • Need for Redistribution of Carbon Budget: Equity principles imply that developed regions should expedite efforts towards achieving net negative emissions and allocate the remaining carbon budget to less developed regions. However, IAM scenarios may not reflect this redistribution of responsibility.

    To address the equity issues highlighted in IPCC reports, several measures can be suggested: (Way Forward)   

    • Equity-Centered Modeling: Modify Integrated Assessment Models (IAMs) to prioritize equity considerations, ensuring that mitigation pathways promote fair burden-sharing between developed and developing countries.
    • Redistribution of Resources: Advocate for the redistribution of financial resources and technology transfer from developed to developing countries to support their climate mitigation and adaptation efforts.
    • Climate Finance: Increase funding for climate adaptation and mitigation projects in developing countries through mechanisms such as the Green Climate Fund, ensuring that resources are allocated equitably and reach the most vulnerable communities.
    • Technology Transfer: Facilitate the transfer of clean and sustainable technologies to developing countries at affordable rates, enabling them to transition to low-carbon development pathways.
    • Policy Coordination: Strengthen international cooperation and coordination on climate policies to ensure coherence and alignment with equity principles, fostering trust and collaboration among countries.
    • Empowerment of Marginalized Communities: Prioritize the inclusion and empowerment of marginalized communities, including indigenous peoples and women, in climate decision-making processes to ensure their voices are heard and their needs addressed.
    • Public Awareness and Education: Promote public awareness and education on the importance of equity in climate action, fostering a sense of shared responsibility and solidarity across countries and communities.

    Conclusion:

    The study on IPCC’s AR6 scenarios reveals persistent inequities in GDP, consumption, and mitigation burden between developed and developing countries. It underscores the importance of integrating equity considerations into climate action to address historical responsibilities and promote fair burden-sharing.

  • Global Methane Tracker, 2024

    Why in the news-

    • Methane emissions from fuel use in 2023 reached nearly record levels, totalling 120 million tonnes (Mt), as per the International Energy Agency’s (IEA) Global Methane Tracker 2024.

    What is Global Methane Tracker (GMT)?

    • The IEA’s Methane Tracker is an online database that tracks oil and gas-related methane sources globally.
    • It provides estimates of emissions across various sectors, including oil, natural gas, coal, and bioenergy, with the energy sector contributing nearly 40% of human-related methane emissions
    • It provides current estimates of methane emissions and highlights potential reductions achievable through existing technologies.

    GMT 2024: Key Findings 

    • Elevated Emissions: Satellite data revealed a more than 50% increase in large methane emissions in 2023 compared to the previous year.
    • Top Emitters: The United States and Russia emerged as the largest emitters of methane from oil and gas operations, contributing significantly to global emissions.
    • Fossil Fuel Leaks: Over 5 Mt of methane emissions were attributed to major fossil fuel leaks globally, including a significant blowout incident in Kazakhstan lasting over 200 days.
    • Cost of Emission Cut: Reducing methane emissions from fossil fuels by 75% by 2030 would require about $170 billion in spending – less than 5% of the income generated by the fossil fuel industry in 2023.

    About Methane Pollution

    • Methane, is an organic compound composed of carbon and four hydrogen atoms (CH4).
    • Second-biggest anthropogenic contributor to global warming after carbon dioxide, 80 times more potent.
    • Global Warming Potential (GWP) measures warming caused by substances relative to carbon dioxide over a century.
    • Methane GWP100: 28, nitrous oxide 265, sulphur hexafluoride 23,500.
    • Short-lived climate pollutant, breaks down in a few years, unlike carbon dioxide.
    • Sources: Cattle farming, landfills, wastewater treatment, rice cultivation, industrial processes.
    • Energy, agriculture, and waste sectors are primary emitters, responsible for 30% of global warming.
    • Livestock emissions, including manure and gastroenteric releases, account for 32% of human-caused emissions.

    Global steps to curb Methane Emissions 

    • Paris Agreement Goal: To limit warming to 1.5°C, methane emissions from fossil fuels must be reduced by 75% by 2030, necessitating substantial efforts and investments.
    • Global Methane Pledge: Launched at UN COP26 climate conference in Glasgow. Over 90 countries signed, led by the United States and the European Union (India not signed up).
    • First Global Stocktake (GST):  Released at COP28, called for countries to accelerate and substantially reduce non-carbon-dioxide emissions globally, including methane, by 2030. But it stopped short of providing a quantifiable target.

     

    Try this PYQ from CSE Prelims 2016:

    Q.In the cities of our country, which among the following atmospheric gases are normally considered in calculating the value of Air Quality Index?

    1. Carbon dioxide
    2. Carbon monoxide
    3. Nitrogen dioxide
    4. Sulphur dioxide
    5. Methane

    Select the correct answer using the codes given below:

    (a) 1, 2 and 3 only

    (b) 2, 3 and 4 only

    (c) 1, 4 and 5 only

    (d) 1, 2, 3, 4 and 5

  • Insights from UNEA-6

    In the news

    • The Sixth Assembly session of the United Nations Environmental Programme (UNEA-6) was convened at its headquarters in Nairobi, Kenya.
    • It focussed on the pivotal role of multilateralism in addressing the triple planetary crisis of climate change, biodiversity loss, and pollution.

    Abut United Nations Environment Assembly (UNEA)

    Details
    Purpose Highest-level decision-making body on environmental matters within the United Nations system.
    Establishment Established in 2012 during the United Nations Conference on Sustainable Development (Rio+20).
    Frequency Typically convenes every two years in Nairobi, Kenya.
    Membership Consists of all 193 UN Member States and representatives from observer countries and organizations.
    Decision-Making Adopts resolutions and decisions on global environmental issues.

     

    UNEA-6: Theme and Focus

    • Theme: Effective, inclusive, and sustainable multilateral actions to tackle climate change, biodiversity loss, and pollution.
    • Focus: Planning the role of multilateralism in shaping global environmental policy to combat the pressing challenges facing our planet.

    Key Outcomes

    [A] Environmental Multilateralism

    • High-Level Dialogues: UNEA-6 dedicated a day to discussing cooperation and convergence with multilateral environmental agreements (MEAs), emphasizing effective implementation at both national and global levels.
    • Importance: MEAs play a critical role in addressing specific environmental issues at national, regional, and global levels, providing essential frameworks for international environmental governance.

    [B] Energy Transition to Renewable Sources

    • Rapid Adoption of Renewable Energy: The session emphasized the need for three times the current renewable energy capacity by 2030 to foster a nature and people-positive planet.
    • Global Standards Development: Efforts are underway to establish globally acceptable standards for renewable energy, ensuring environmental sustainability and responsible sourcing of minerals.

    [C] Plastic Pollution

    • Call for Action: Discussions centered on a legally binding treaty on plastic pollution, aiming to introduce strong reuse provisions and harmonize definitions of reuse and circularity.
    • Current Scenario: More than half of global plastic production comprises single-use plastics, with significant leakage into the environment.

    [D] Role of Nature-Based Solutions

    • Potential: Nature-based solutions, including reforestation and land restoration, offer promising avenues to combat the climate crisis and restore biodiversity.
    • Financial Constraints: Despite their potential, nature-based solutions receive only a fraction of the required funding, highlighting the need for increased investment and innovative financing mechanisms.

    Conclusion

    • As UNEA-6 unfolds, stakeholders worldwide are poised to collaborate and drive actionable solutions to safeguard our planet for future generations.

  • Early Bloom of Jacaranda sparks Climate Debate in Mexico

    Jacaranda

    Introduction

    • Mexico City’s iconic jacaranda trees, known for their stunning purple blooms in spring, are experiencing an unusual phenomenon this year, with some trees blooming as early as January instead of their typical spring awakening.

    About Jacaranda Trees

    • Jacaranda is a genus of flowering plants belonging to the family Bignoniaceae.
    • Native to tropical and subtropical regions of Central and South America, with some species found in the Caribbean and Africa.
    • Known for its stunning clusters of trumpet-shaped flowers in shades of purple, blue, or white, Jacaranda trees are prized as ornamental plants in parks, gardens, and urban landscapes worldwide.
    • Jacaranda trees hold cultural significance in various regions, such as Brazil, where their blooming heralds the arrival of spring, and South Africa, where they are commonly planted in urban areas.
    • Some species of Jacaranda produce valuable timber, prized for its lightweight nature, durability, and attractive grain pattern, suitable for furniture and decorative woodworking.
    • While generally not invasive, Jacaranda trees can become weedy in introduced regions, though their ornamental value often outweighs any negative impacts, making them well-tolerated in urban landscapes.

  • Representative Concentration Pathways (RCPs) by IPCC

    In the news

    • This newscard is an excerpt from an original article published in the TIE.

    What are Representative Concentration Pathways (RCPs)?

    • The Representative Concentration Pathways (RCPs) were rolled out as part of the Fifth Assessment Report (AR5) of the IPCC in 2014.
    • These are basically emission scenarios that depict pathways of greenhouse gas and aerosol emissions resulting from human activities over time, crucial for climate modelling and forecasting.
    • These pathways were introduced to provide a consistent set of GHGs concentration trajectories for climate modelling and research purposes.
    • The RCPs were officially selected and defined based on their total radiative forcing levels in the year 2100.

    These pathways describe various climate change scenarios based on the amount of greenhouse gases emitted.

    1. RCP 2.6: Limits global warming to less than 2°C above pre-industrial levels while also attempting to keep ocean acidification under control. Greenhouse gas emissions must be reduced significantly compared to current levels.
    2. RCP 4.5: Reflects an intermediate scenario where emissions peak around 2040 and then gradually decrease. Global mean temperature rise is projected to reach approximately 2°C above pre-industrial levels by 2100.
    3. RCP 6: Stabilizes radiative forcing at 6 watts per square meter (W/m²) after 2100 following peaking around mid-century. It aims to achieve a lower level of global warming but does not exclude temporary overshoots beyond 2°C.
    4. RCP 8.5: Presents a high-emission scenario characterized by increasing radiative forcing throughout the century. By 2100, it results in a global mean temperature increase of over 4°C above pre-industrial levels.

    Back2Basics: Intergovernmental Panel on Climate Change (IPCC)

    Description
    Establishment Established in 1988 by WMO and UNEP
    Membership 195 member countries.
    Objective Assess scientific info on human-induced climate change, impacts, and mitigation/adaptation options.
    Main Activity Prepares assessment, special, and methodology reports, crucial for international climate negotiations.
    Scientific Research Relies on global scientific community for literature review and conclusions.
    Working Groups Comprises three groups:

    1. I (climate physics),
    2. II (impacts/adaptation), and
    3. III (mitigation)
    Reports Each group issues reports, compiled into a synthesis report.

    Try this PYQ from CSP 2018:

    “Momentum for Change: Climate Neutral Now” is an initiative launched by:

    (a) Intergovernmental Panel on Climate Change

    (b) UNEP Secretariat

    (c) UNFCCC Secretariat

    (d) World Meteorological Organisation

    [wpdiscuz-feedback id=”vot1xq3ins” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

  • What are ‘Super Pollutants’?

    Why in the News?

    • Recently, the annual meeting of the Climate and Clean Air Coalition (CCAC) which took place from 21 to 23 February 2024 in Nairobi, Kenya on the margins of the Sixth session of the United Nations Environment Assembly (UNEA-6) highlighted the critical importance of international collaboration in combating short-lived climate pollutants, commonly known as “Super Pollutants.”

    What are Super Pollutants?

    • Super pollutants, or short-lived climate pollutants (SLCPs), have a shorter atmospheric lifespan compared to CO2 but significantly impact climate change and air quality. Methane (CH4), black carbon (soot), hydrofluorocarbons (HFCs), and tropospheric ozone (O3) are some of the major superpollutants.

    Impacts of Super Pollutants

    • Methane (CH 4):
      • Characteristics: Potent greenhouse gas emitted from various sources such as livestock and fossil fuel production.
      • Its Impact: Traps heat in the atmosphere, exacerbating climate change.
    • Black Carbon (Soot):
      • Characteristics: Fine particulate matter from incomplete combustion of fuels.
      • Its Impact: Absorbs sunlight, heats the atmosphere, and accelerates the melting of snow and ice.
    • Hydrofluorocarbons (HFCs):
      • Characteristics: Synthetic greenhouse gases used in refrigeration.
      • Its Impact: High global warming potential despite short atmospheric lifespan.
    • Tropospheric Ozone (O3):
      • Characteristics: Secondary pollutants formed from VOCs and NOx.
      • Its Impact: Contributes to smog, has adverse health effects, and acts as a greenhouse gas.

    About Climate and Clean Air Conference 2024:

    • What is the aim and objective?
      • The CCAC 2024 moved the dialogue forward, focusing on the cost of inaction, highlighting ways to further scale up implementation of the Global Methane Pledge, Clean Air Flagship and Kigali Amendment, and collectively charting the course to 2025 and beyond.
    • What did the CCAC 2024 Feature for?
      • National policy and planning: High-level plenary sessions on global, regional and national efforts to reduce methane, black carbon, and HFCs, including the benefits of fast action, and financing for implementation.
      • Science and Technology: Science Policy Dialogue sessions on latest emerging science and how new information can inform policy development. Technical sessions among CCAC Sector Hub members to showcase best practices in key emitting sectors: agriculture, cooling, fossil fuels, heavy-duty vehicles and engines, household energy, and waste.
      • Focus on Implementation: Practical sessions to further refine work plans among CCAC National Consultants; Non-State Partners and Scientific Advisory Panel Members.
    • What are the Functions?
      • The CCAC works at the nexus of climate and air quality, to deliver multiple benefits from the fast mitigation of short-lived climate pollutants.
      • Driven by policy-relevant science and pragmatism, CCAC works from the ground up, equitably and inclusively, empowering our partners to achieve their respective National Goals and catalyzing action — as well as from the top down, bringing together ministers and leaders to drive high-level ambition.
    • About the previous Conference:
      • The CCAC 2023 was held in Bangkok.
      • As an outcome of this conference, CCAC 2023 integrated planning on climate and clean air is essential to identify priority actions in key emitting sectors to scale up mitigation, and action at the national and regional level is motivating collaboration at the global scale.