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Subject: Climate Change

1. Global Warming and Issues
2. All about Pollution

  • What is El Nino and How it impacts the Monsoon?

    el nino

    Central Idea

    • Delay in Monsoon: Any discussion on Indian monsoon delay these days invariably has references to the El Nino phenomenon.
    • Sudden rise of El Nino: This year’s monsoon is also progressing under the cloud of an El Nino in the Pacific Ocean.

    Understanding El Nino and La Nina

    • El Nino and La Nina are two opposite phases of the El Nino-Southern Oscillation (ENSO) cycle.
    • ENSO is a naturally occurring phenomenon that involves the interaction between the ocean and atmosphere in the equatorial Pacific.

    Here is a detailed comparison of El Nino and La Nina

    El Nino La Nina
    Definition Warmer-than-normal sea surface temperatures Cooler-than-normal sea surface temperatures
    Frequency Every two to seven years Every two to seven years
    Duration Several months to a year or more Several months to a year or more
    Impact on winds Weakens trade winds, leading to changes in patterns Strengthens trade winds, leading to changes in patterns
    Impact on rains Reduces rainfall and can cause droughts Increases rainfall and can cause flooding
    Impact on temp. Warmer-than-average temperatures Colder-than-average temperatures
    Global effects Droughts in Asia and Africa, floods in Americas Floods in Asia and Africa, droughts in South America

     

    Impact on India

    El Nino La Nina
    Associated with weak monsoons and drought-like conditions in India Associated with above-normal rainfall and floods in India
    Sea surface temperature in the equatorial Pacific Ocean rises above normal levels Sea surface temperature in the equatorial Pacific Ocean drops below normal levels
    Changes in the atmospheric circulation patterns Changes in the atmospheric circulation patterns
    Shift in the location of the jet stream, affecting the strength and direction of the monsoon winds Increase in the strength of the monsoon winds, bringing more moisture and rainfall to India
    Results in reduced rainfall, dry spells, and heatwaves, leading to crop failures and water scarcity Excessive rainfall can also lead to floods and landslides, causing damage to crops and infrastructure

     

    El Nino and Indian Monsoon

    • El Nino and its impact on Indian monsoon: El Nino refers to abnormal warming of surface waters in the equatorial Pacific Ocean, which tends to suppress monsoon rainfall in India.
    • Phases of El Nino Southern Oscillation (ENSO): ENSO consists of three phases in the Pacific Ocean: El Nino, La Nina (abnormal cooling), and a neutral phase with sea surface temperatures close to long-term averages.
    • Ocean and atmospheric conditions: ENSO involves not only temperature abnormalities of sea surface waters but also atmospheric conditions, including differences in sea-level air pressure and wind strength and direction.
    • Southern oscillation and the role of winds: Southern Oscillation Index measures the difference in sea-level air pressure over the western and eastern sides of the Pacific Ocean, while wind patterns play a crucial role in ENSO.

    Factors triggering El Nino

    • Weakening trade winds: When the trade winds in the tropical Pacific weaken, it contributes to the occurrence of El Nino by reducing the movement of warm surface waters.
    • Changes in ocean currents: Alterations in the normal patterns of ocean currents can trigger El Nino events as they affect the distribution and accumulation of warm water in the central and eastern Pacific.
    • Variations in atmospheric pressure: Fluctuations in atmospheric pressure patterns disrupt the typical circulation associated with trade winds, which can initiate the onset of El Nino conditions.
    • Influence of oceanic Kelvin waves: The presence and behavior of oceanic Kelvin waves, large-scale waves that transport warm water eastward, play a role in the development and intensification of El Nino events.
    • Interactions with other climate modes: El Nino can be influenced by the interactions and connections with other climate phenomena such as the Indian Ocean Dipole and the Madden-Julian Oscillation, which can impact the oceanic and atmospheric conditions in the Pacific region.

    Measuring the Cycle

    (1) Oceanic Nino Index (ONI)

    • Measures the oceanic component of El Nino Southern Oscillation (ENSO).
    • Tracks the departure from average sea surface temperatures in the tropical Pacific Ocean.
    • Helps quantify the intensity and duration of El Nino or La Nina events.
    • Typically based on a rolling three-month average of sea surface temperature anomalies in specific regions.

    (2) Southern Oscillation Index (SOI)

    • Measures the atmospheric component of ENSO.
    • Quantifies the difference in air pressure between two locations: Tahiti and Darwin.
    • Positive SOI values indicate higher pressure in the eastern Pacific and lower pressure in the western Pacific.
    • Negative SOI values indicate lower pressure in the eastern Pacific and higher pressure in the western Pacific.
    • Reflects the strength and changes in the atmospheric circulation patterns associated with ENSO.
    • Used to assess the phase and strength of ENSO and its impact on global weather and climate patterns.

    Economic impact of El Nino on Indian Agriculture

    • Drought and reduced rainfall: El Nino events often lead to below-average monsoon rainfall in India, resulting in drought conditions in various regions.
    • Crop failure and lower yields: Lack of adequate water availability can lead to crop failure or lower yields for major crops such as rice, wheat, pulses, and oilseeds.
    • Increased input costs: During El Nino-induced droughts, farmers may need to invest in additional irrigation, water management, and supplementary feeding for livestock, leading to increased input costs.
    • Price fluctuations: Reduced crop production due to El Nino can affect market supply, leading to price fluctuations and potential inflation in food prices.
    • Livestock and fisheries: Water scarcity and changes in marine ecosystems can negatively affect animal husbandry and fishing activities, disrupting the livelihoods of those dependent on these sectors.
    • Rural livelihoods and migration: The economic stress created can impact rural livelihoods, leading to increased migration from rural to urban areas in search of alternative employment opportunities.

    Try this PYQ:

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

    1. La Nina is characterized by unusually cold ocean temperature in equatorial Indian Ocean whereas El Nino is characterized by unusually warm ocean temperature in the equatorial Pacific Ocean.
    2. El Nino has an 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) Only 1

    (b) Only 2

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

    [wpdiscuz-feedback id=”2c11bi6xlo” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

  • Cyclone Biparjoy and its Naming

    Cyclone Biparjoy
    PC: windy.com

    Central Idea: A cyclonic storm, named Biparjoy, has developed in the Arabian Sea.

    Cyclone Biparjoy

    • It was stationed about 850 km west of Goa and 900 km southwest of Mumbai.
    • The cyclone is predicted to gain in strength over the next three days and develop into a very severe cyclonic storm by June 13.
    • It would result in squally weather with wind speeds reaching 35-45 kmph along the coastline of Karnataka, Goa, and Maharashtra
    • The IMD has not yet predicted any major impact on countries adjoining the Arabian Sea, including India, Oman, Iran, and Pakistan.

    How it was named?

    • Origin of Cyclone Biparjoy’s Name: ‘Biparjoy’ was suggested by Bangladesh and the word means ‘disaster’ or ‘calamity’ in Bengali. The next cyclone after Biparjoy will be named ‘Tej’ based on India’s suggestion.
    • Rotational Basis for Naming: The naming of cyclones is done by countries on a rotational basis, following certain existing guidelines.
    • Responsibilities of RSMCs and TCWCs: Worldwide, there are six regional specialized meteorological centers (RSMCs) and five regional Tropical Cyclone Warning Centers (TCWCs) mandated for issuing advisories and naming of tropical cyclones.
    • IMD’s Role: IMD is one of the six RSMCs providing tropical cyclone and storm surge advisories to 13 member countries under the WMO/Economic and Social Commission for Asia-Pacific (ESCAP) Panel.
    • Naming Authority of IMD: RSMC, New Delhi, is also mandated to name the tropical cyclones developing over the north Indian Ocean, including the Bay of Bengal and the Arabian Sea.
    • Guidelines for Naming: Some rules are to be followed while naming cyclones, such as being neutral to politics, religious beliefs, cultures, and gender, avoiding offensive or cruel names, and keeping the name short and easy to pronounce.
    • Next Cyclone Name: After Bangladesh, the next cyclone will be named ‘Tej’ based on India’s suggestion.

    Cyclones in the Arabian Sea: A quick recap

    • Frequency of Cyclones: It is not rare for cyclones to develop in the Arabian Sea. There are fewer cyclones compared to the Bay of Bengal, but it is not uncommon.
    • Favorable Months: June is one of the favorable months for the formation of cyclones in the Arabian Sea.
    • Factors Influencing Cyclone Formation: Cyclones form due to low-pressure systems over warm waters. The Bay of Bengal is slightly warmer, but the Arabian Sea is also getting warmer due to climate change, leading to an increase in cyclones.
    • Coriolis Effect and Weather Systems: In a depression or low-pressure situation, the air blows in an anticlockwise direction in the northern hemisphere, influenced by the Coriolis Effect.

    Role of Climate Change

    • Historical data indicates that the frequency of extremely severe cyclonic storms has increased over the Arabian Sea since 1990, while it has remained the same over the Bay of Bengal.
    • A 2021 study highlighted the increasing intensity, frequency, and duration of cyclonic storms in the Arabian Sea.
    • The warming is indicated by the nearly tripled accumulated cyclone energy, reflecting the extent of warming in recent years.

    Back2Basics:

    Tropical Cyclones
    Definition Intense circular storm over warm oceans with low pressure, high winds, and heavy rain.
    Formation Conditions Warm sea surface temperatures, anticlockwise rotation of low-level air, favorable atmospheric conditions.
    Conducive Periods April-May and October-December.
    Movement and Moisture Cyclones move northwest, gather moist air, and intensify.
    Requirements for Cyclogenesis Warm sea temperatures, atmospheric instability, high humidity, Coriolis force, low-level disturbance, low vertical wind shear.
    Sea temperatures Temperature of at least 28°C.
    Atmospheric instability Allows vertical air movement.
    Role of Coriolis Force Required for low-pressure center formation.
    Low vertical wind shear Maintains cyclone structure.

     

  • 50th anniversary of World Environment Day

    world environment day plastic

    Central Idea

    • Plastics have become an integral part of human life, despite their adverse environmental impact.
    • World Environment Day (5th June) serves as a reminder of our responsibility to address plastic pollution.

    Why in news?

    • 50th Anniversary of World Environment Day: The day, led by UNEP since 1973, marks its 50th anniversary this year.
    • Global Platform for Environmental Outreach: World Environment Day has grown into the largest global platform for environmental outreach.
    • Theme- #BeatPlasticPollution: This year’s World Environment Day focuses on the urgent need to combat plastic pollution.

    World Environment Day 2023
    Date June 5th
    Theme (2023) Ecosystem Restoration
    Host Country (2023) Pakistan
    Established World Environment Day was established in 1972 by the United Nations at the Stockholm Conference on the Human Environment
    Purpose To raise awareness and promote action for environmental protection
    Importance Platform for global environmental campaigns and initiatives
    Activities Various activities are organized worldwide, such as tree planting, clean-up drives, and educational programs
    Previous Themes Previous themes have focused on topics like biodiversity, air pollution, plastic pollution, and more
    Organized by United Nations Environment Programme (UNEP)

    Plastic pollution and the need for Solutions

    • Plastic pollution is a pressing global issue that requires immediate attention.
    • Over 400 million tonnes of plastic are produced annually, with less than 10% being recycled.
    • Plastic pollution negatively affects ecosystems and poses risks to human health.

    Understanding Plastic Pollution

    platic environment day

    • Versatile Nature of Plastics: Plastics are synthetic materials capable of being shaped and molded according to requirements.
    • Types of Plastics: Commodity plastics, such as PET, HDPE, PVC, LDPE, PP, and PS, dominate global production.
    • Identification Codes and Different Properties: Plastics can be identified by their resin identification codes (RIC) and possess distinct properties.

    Environmental impact of plastics

    • Plastics have revolutionized various industries but raise significant environmental concerns.
    • Plastics have a slow decomposition rate, leading to the persistence of plastic waste.
    • Microplastics, including primary and secondary types, accumulate in various environments.

    Health risks and toxic chemicals

    • Microplastics contain toxic chemicals that pose risks to human health.
    • Bisphenol A (BPA) in microplastics can have detrimental effects on human health.

    Worst examples of Plastic Pollution

    • The Great Pacific Garbage Patch is a vast collection of plastic and microplastic waste.
    • It was formed due to converging ocean currents and is situated in the North Pacific Ocean.
    • It covers a surface area of 1.6 million sq km, with smaller patches in other oceans.

    Actions against Plastic Pollution

    • Urgency for Collective Action: Plastic pollution necessitates collective efforts and immediate action.
    • World Environment Day’s Reminder of Responsibility: World Environment Day serves as a reminder of our responsibility to address plastic pollution.

    Way forward

    • Plastic Recycling: Advanced recycling technologies offer new ways to efficiently recycle plastic waste.
    • Promoting Circular Economy Models: Embracing circular economy principles can reduce plastic waste and promote sustainable resource usage.
    • Education and Awareness Campaigns: Spreading awareness and educating the public about the impact of plastic pollution can drive behavioral change.
    • Collaboration between Industries and Governments: Cooperation between industries and governments is essential to develop comprehensive strategies for tackling plastic pollution.

  • Role of Evapotranspiration in Earth’s Dynamic Processes

     

    evapotranspiration

    Central Idea:  Evapotranspiration is a key process in Earth’s dynamic systems, impacting the movement of water and nutrients, influencing the water cycle, and providing crucial information for farmers to manage irrigation and water resources effectively.

    Understanding Evapotranspiration

    • Definition: Evapotranspiration refers to the movement of water from terrestrial surfaces into the atmosphere and is a crucial part of the planet-wide water cycle.
    • Water cycle and its connection to evapotranspiration: Evapotranspiration is an amalgamation of evaporation (water loss from soil) and transpiration (water movement and loss by plants), both of which contribute to the overall movement of water in the water cycle.
    • Breakdown of the term: Evapotranspiration encompasses the movement of water upward through plants and its subsequent loss into the air from exposed plant parts.

    Factors affecting Evapotranspiration

    • Rate of evapotranspiration: Several factors impact the rate of evapotranspiration, including solar radiation, day length, soil moisture levels, ambient temperature, wind conditions, and the amount of water vapour already present in the air.
    • Insolation and its effect: The intensity of solar radiation directly affects the rate of evapotranspiration, as it provides the energy needed to evaporate water from terrestrial surfaces.
    • Role of day length: The length of the day, soil moisture content, ambient temperature, wind patterns, and the moisture content of the air all contribute to the rate at which evapotranspiration occurs.

    Historical significance of evapotranspiration

    • Origin and age of the term: The term “evapotranspiration” has been in use for at least 86 years and was initially published with a hyphenated form.
    • Contribution of Charles Warren Thornthwaite in 1944: Thornthwaite, an American climatologist, defined and popularized the term “evapotranspiration” in 1944.
    • Relevance for farmers in estimating water needs for crops: Even today, evapotranspiration remains significant for farmers who utilize it to estimate the amount of water required to irrigate their crops effectively.

    Back2Basics: Water Cycle

    • The water cycle, also known as the hydrological cycle, is the continuous movement and circulation of water on, above, and below the Earth’s surface.
    • Stages of the Water Cycle include:
    1. Evaporation: The process by which water changes from a liquid state to a gaseous state, rising into the atmosphere.
    2. Condensation: The cooling of water vapor in the atmosphere, causing it to change from a gaseous state back to a liquid state, forming clouds.
    3. Precipitation: When condensed water droplets combine and fall from the atmosphere as rain, snow, sleet, or hail.
    4. Runoff: The movement of water on the Earth’s surface, flowing into streams, rivers, lakes, and eventually into the oceans.
    5. Infiltration: The process by which water seeps into the ground and becomes groundwater.
    6. Transpiration: The release of water vapor from plant surfaces into the atmosphere.

     

  • Slowing of Overturning Circulation in Antarctic

    overturning

    Central Idea

    • Recent research indicates that the Antarctic overturning circulation, a global network of ocean currents, is slowing down at a faster rate than previously predicted.
    • The overturning circulation is crucial for redistributing heat, carbon, and nutrients, and maintaining Earth’s climate stability and deep-ocean oxygen levels.

    What is Overturning Circulation?

    • The overturning circulation (OC) refers to the large-scale circulation pattern in the global ocean, involving both surface and deep currents.
    • It is a network of ocean currents that plays a crucial role in redistributing heat, carbon, and nutrients around the globe.
    • It is driven by the sinking of dense, cold, oxygen-rich water from the ocean surface to the deep ocean and the rising of less dense water in different regions.

    How does it work?

    • It operates on a global scale and involves the sinking and rising of water masses driven by density differences.
    • Cold, dense water sinks in certain regions, while warmer, less dense water rises in other areas, creating a continuous flow of water.

    Key components and processes

    • Antarctic Bottom Water: Cold, dense water forms near Antarctica and sinks to the ocean floor, spreading northward along the seafloor.
    • North Atlantic Deep Water: Another dense water mass forms in the North Atlantic and sinks to great depths.
    • Thermohaline Circulation: Temperature and salinity differences drive the sinking and rising of water masses, influencing the overturning circulation.
    • Deep Ocean Currents: Once the dense water sinks, it flows along the deep ocean basins, connecting various regions of the world ocean.

    Observing and studying the OC

    • Monitoring the overturning circulation is challenging due to its vast scale and complex dynamics.
    • Observations include ship-based measurements, moored instruments, floats, satellites, and numerical models.
    • Scientists use a combination of measurements and simulations to understand the behavior and changes in the overturning circulation.

    Importance of the Overturning Circulation

    • Heat redistribution: The overturning circulation helps regulate Earth’s climate by transporting heat from the equator to the poles and vice versa.
    • Assist carbon cycle: It plays a vital role in redistributing carbon dioxide and other greenhouse gases, impacting the global carbon cycle.
    • Nutrient cycling: The circulation also facilitates the transport of nutrients, affecting marine ecosystems and productivity.

    Consequences of a Slowing OC

    • Climatic changes: A slowdown in the overturning circulation can have significant consequences for Earth’s climate and marine ecosystems.
    • Nutrient disruption: It can disrupt the transport of heat, carbon, and nutrients, leading to changes in regional and global climate patterns.
    • De-oxygenation: Reduced oxygen supply to the deep ocean can affect deep-sea marine life and potentially lead to shifts in species distribution.

    Impact of Melting Antarctic Ice

    • Melting Antarctic ice disrupts the formation of Antarctic bottom water, a key component of the overturning circulation.
    • Freshening of surface waters due to melt-water makes them less dense and less likely to sink, slowing down the circulation.

    Future Outlook

    • Antarctica’s ice loss is expected to continue and accelerate with global warming.
    • Anticipated freshening due to increased ice loss will prolong the slowdown and further decrease deep-ocean oxygen levels.
    • The consequences of the slowdown extend beyond Antarctica, affecting the global ocean, climate change, and sea level rise.
    • Urgent action to reduce greenhouse gas emissions is necessary to address these issues.

    Way forward

    • Intensify efforts to reduce greenhouse gas emissions.
    • Implement measures to mitigate ice loss from Antarctica and address the freshening of surface waters.
    • Promote scientific research and monitoring to understand and respond to the ongoing changes.
    • Raise awareness about the importance of the overturning circulation and its impact on climate and marine ecosystems.

     

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  • Antarctic Sea Ice Cover at Record Low

    antarctic

    Central Idea

    • Sea ice in Antarctica reached its smallest area on record in February for the second consecutive year, continuing a decade-long decline.

    Ice cover decline: Key data

    (1) Square km decline

    • The European Union’s Copernicus Climate Change Service (C3S) provided the figures, highlighting the significant decrease in Antarctic sea ice.
    • On February 16, the ocean surface covered by ice around Antarctica shrank to 2.09 million square kilometers (800,000 square miles), the lowest level since satellite records began.

    (2) Warming trends

    • Both the North and South poles have experienced significant warming, with temperatures rising by approximately 3 degrees Celsius compared to late 19th-century levels, three times the global average.
    • Arctic sea ice has been diminishing by about 3 percent per year since the late 1970s, while sea ice in Antarctica has remained relatively constant with large annual variations.

    (3) Regional variances and vulnerabilities

    • Recent ice cover reduction during the southern hemisphere summer has been most pronounced in West Antarctica, which is more vulnerable to the impacts of global warming compared to East Antarctica.
    • Antarctica witnessed its first recorded heatwave in 2020, with temperatures 9.2 degrees Celsius above the mean maximum. Unusual temperature spikes have been observed in various parts of Antarctica.
    • The Arctic has also experienced significant declines in sea ice, with the record minimum sea ice extent occurring in 2012.

    Impact of declining Ice Cover

    • Global sea level rise: Melting ice in Antarctica contributes to rising sea levels worldwide.
    • Disruption of ecosystems: Declining ice cover disrupts habitats and food sources for ice-dependent species.
    • Increased warming: Less ice reflects sunlight, leading to more heat absorption and further ice melting.
    • Changes in ocean circulation: Declining ice cover can disrupt currents and impact global climate patterns.
    • Release of stored carbon: Melting ice releases trapped carbon, potentially affecting marine ecosystems and contributing to climate change.
    • Amplification of global warming: Reduced ice cover creates a positive feedback loop, exacerbating climate change.
    • Disruption of biodiversity and food chains: Changing ice conditions impact species relying on ice algae and affect the overall Southern Ocean ecosystem.

    Future projections

    • The Intergovernmental Panel on Climate Change (IPCC) predicted with high confidence that the Arctic Ocean would become practically ice-free in September at least once by mid-century.
    • The decreasing trends in both Arctic and Antarctic sea ice highlight the urgent need to address climate change and its impact on the Polar Regions.

     

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  • India-EU discuss ways to resolve Carbon Border Tax

    Central Idea

    Why such move?

    • The EU is India’s second-largest trading partner and export market.
    • India has expressed confidence that the intention behind CBAM was not to create a trade barrier but to promote sustainability.
    • CBAM has potential impact on India’s Steel and Aluminum sectors.

    Carbon Border Adjustment Mechanism (CBAM)

    Proposed by European Union (EU)
    Purpose To reduce carbon emissions from imported goods and prevent competitive disadvantage against countries with weaker environmental regulations
    Objectives Reduce carbon emissions from imported goods

    Promote a level playing field between the EU and its trading partners

    Protect EU companies that have invested in green technologies

     

    How does CBAM work?

    Coverage Applies to imported goods that are carbon-intensive
    Integration Covered by the EU’s Emissions Trading System (ETS), which currently covers industries like power generation, steel, and cement
    Implementation CBAM taxes would be imposed on the carbon content of imported goods at the border, and the tax rates would be based on the carbon price in the EU ETS
    Exemptions Possible exemptions for countries that have implemented comparable carbon pricing systems
    Revenue Use Revenue generated from CBAM taxes could be used to fund the EU’s climate objectives, such as financing climate-friendly investments and supporting developing countries’ climate efforts

     

    Who will be affected by CBAM?

    Details
    Countries Non-EU countries, including India, that export carbon-intensive goods to the EU
    Items Initially covers iron and steel, cement, aluminium, fertilisers, and electric energy production
    Expansion The scope of the CBAM may expand to other sectors in the future

    Advantages offered

    • Encourages non-EU countries to adopt more stringent environmental regulations, reducing global carbon emissions.
    • Prevents carbon leakage by discouraging companies from relocating to countries with weaker environmental regulations.
    • Generates revenue that could be used to support EU climate policies.

    Challenges with CBAM

    • Difficulty in accurately measuring the carbon emissions of imported goods, especially for countries without comprehensive carbon accounting systems.
    • Potential for trade tensions with the EU’s trading partners, especially if other countries implement retaliatory measures.

    Ways to ease impact of CBAM

    To minimize the impact of CBAM, India can consider several actions:

    • Set up a carbon trading mechanism: To reflect the level of development and adjust the carbon tax paid domestically when paying CBT to the EU.
    • Re-designate taxes on essential products: Make these as carbon taxes, which could help lower the net impact of CBT.
    • Create a cadre of energy auditors: To ensure fair assessment of carbon emissions for products and help the industry calculate carbon intensity and adopt cleaner technologies.
    • Start an industry awareness program: To educate sectors affected by CBT and create a dedicated group involving government, industry associations, and researchers.
    • Devise a WTO-compatible retaliation mechanism: To counter CBT, considering that developing countries exporting to developed nations will also suffer from it.
    • Sign new Free Trade Agreements (FTAs): After resolving the CBT issue, as high CBT would undermine the benefits of zero import duties.
    • Expose the perceived hypocrisy: Utilize global platforms to expose offshoring pollution of developed countries and proposing to tax imports, while not addressing their own consumption patterns.

    Conclusion

    • The CBAM is a proposed policy by the EU to reduce carbon emissions from imported goods and to promote a level playing field between the EU and its trading partners.
    • Although the CBAM has its challenges, it has the potential to incentivize non-EU countries to adopt more stringent environmental regulations and reduce global carbon emissions.

     

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  • Understanding Temperature Anomalies

    temperature

    Central idea: Global warming does not mean that each month or each year will be warmer than the previous month or the previous year.

    What is Temperature Anomaly?

    • This is a measure of how much the actual temperature deviates from the long-term average temperature for a particular location and time period.
    • Anomalies are calculated by taking the difference between the actual temperature and the long-term average temperature, and then averaging this difference over a specified period.
    • The anomalies are due to land-ocean-atmosphere processes that dynamically determine the weather and climate.
    • It is a useful tool for understanding changes in climate over time, as they allow scientists to compare temperatures from different time periods and locations.
    • For example, a temperature anomaly of +2°C in a particular region in a given year means that the temperature in that region was 2°C higher than the long-term average for that region and time period.

    Why study this?

    • Long-term trend: By analyzing temperature anomalies over time, scientists can identify long-term trends in climate change and predict future changes.
    • Track extreme weather event: These are also used to monitor extreme weather events such as heatwaves, droughts, and floods, which can have significant impacts on human health, agriculture, and natural ecosystems.

    Recent context: Second warmest March on record

    • The fact that March 2023 was the second warmest March on record suggests that the planet is experiencing long-term warming.
    • It is a clear indication of the impact of human activities on the planet.
    • The burning of fossil fuels and deforestation have led to an increase in greenhouse gases, which trap heat in the Earth’s atmosphere and contribute to global warming.
    • This warming trend is expected to continue and worsen in the coming years, leading to more extreme weather events, sea level rise, and other negative impacts on the planet.

    What does this mean for local weather?

    • The second warmest March on record can have significant impacts on local weather patterns.
    • As mentioned earlier, the warming over the northwest to the west of India caused cooler than normal weather over Mumbai and excess pre-monsoon rains over the northwest.
    • On the other hand, Kerala and Odisha experienced scorching heatwaves.
    • These weather anomalies can have serious implications for agriculture, water resources, and public health.

    Implications

    • Crop yields decline: This can be affected by extreme weather events, and changes in precipitation patterns can lead to water shortages or flooding.
    • Heatwaves: This can cause heat stress and other health problems, particularly for vulnerable populations such as the elderly and young children.

     

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  • What is Carbon Border Adjustment Mechanism (CBAM)?

    carbon

    The Indian government will be analyzing how the European Union’s (EU’s) proposed carbon border adjustment mechanism (CBAM) will affect the Indian industry. The CBAM is set to start from October this year.

    Carbon Border Adjustment Mechanism (CBAM)

    Proposed by European Union (EU)
    Purpose To reduce carbon emissions from imported goods and prevent competitive disadvantage against countries with weaker environmental regulations
    Objectives Reduce carbon emissions from imported goods

    Promote a level playing field between the EU and its trading partners

    Protect EU companies that have invested in green technologies

     

    How does CBAM work?

    Coverage Applies to imported goods that are carbon-intensive
    Integration Covered by the EU’s Emissions Trading System (ETS), which currently covers industries like power generation, steel, and cement
    Implementation CBAM taxes would be imposed on the carbon content of imported goods at the border, and the tax rates would be based on the carbon price in the EU ETS
    Exemptions Possible exemptions for countries that have implemented comparable carbon pricing systems
    Revenue Use Revenue generated from CBAM taxes could be used to fund the EU’s climate objectives, such as financing climate-friendly investments and supporting developing countries’ climate efforts

     

    Who will be affected by CBAM?

    Details
    Countries Non-EU countries, including India, that export carbon-intensive goods to the EU
    Items Initially covers iron and steel, cement, aluminium, fertilisers, and electric energy production
    Expansion The scope of the CBAM may expand to other sectors in the future

    Advantages of CBAM

    • Encourages non-EU countries to adopt more stringent environmental regulations, reducing global carbon emissions.
    • Prevents carbon leakage by discouraging companies from relocating to countries with weaker environmental regulations.
    • Generates revenue that could be used to support EU climate policies.

    Challenges with CBAM

    • Difficulty in accurately measuring the carbon emissions of imported goods, especially for countries without comprehensive carbon accounting systems.
    • Potential for trade tensions with the EU’s trading partners, especially if other countries implement retaliatory measures.

    Conclusion

    • The CBAM is a proposed policy by the EU to reduce carbon emissions from imported goods and to promote a level playing field between the EU and its trading partners.
    • Although the CBAM has its challenges, it has the potential to incentivize non-EU countries to adopt more stringent environmental regulations and reduce global carbon emissions.

     

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  • Oceans absorb 90% of human-induced planet warming: Study

    ocean

    The study published in the journal Earth System Science Data estimates that almost 90% of the warming that has occurred in the last 50 years has been absorbed by the ocean, with the remaining heat absorbed by the land, cryosphere and atmosphere.

    Earth’s energy balance: A quick recap

    ocean

    • It is the balance between the amount of energy that Earth receives from the Sun and the amount of energy that Earth radiates back into space.
    • It is also known as the radiation budget.
    • The energy from the Sun that Earth receives is mainly in the form of visible light and ultraviolet radiation.
    • This energy is absorbed by the Earth’s surface and atmosphere, which then radiate it back into space in the form of infrared radiation.
    • The balance between incoming and outgoing radiation is crucial for maintaining the Earth’s temperature and climate.
    • Any imbalance between the two can lead to global warming and climate change.
    Description
    Total incoming solar radiation Approximately 342 W/m² reaches Earth’s atmosphere
    Albedo About 30% of incoming solar radiation is reflected back to space
    Greenhouse effect Remaining 70% of incoming solar radiation is absorbed by Earth’s surface and atmosphere, creating the greenhouse effect
    Atmospheric heat Atmosphere contains only 0.001% of Earth’s heat energy, but is crucial in regulating heat budget

     

    Key highlights of the Study: Heat Accumulation

    heat

    • The study estimates that approximately 381 zettajoules (ZJ) of heat accumulated on the planet from 1971-2020 due to anthropogenic emissions.
    • This roughly equals a heating rate of approximately 0.48 watts per square metre (Earth Energy Imbalance or EEI). EEI is the difference between incoming and outgoing solar radiation.
    • According to the study, about 89% of the accumulated heat is stored in the ocean, 6% on land, a percent in the atmosphere, and about 4% available for melting the cryosphere.

    Implications

    (1) Land Heat Accumulation

    • Heat accumulated on land drives up ground surface temperatures, which may increase soil respiration, releasing carbon dioxide in the process.
    • Higher soil respiration will likely decrease soil water, depending on climatic and meteorological conditions and factors.

    (2) Inland Water Bodies and Permafrost Thawing

    • Heat storage within inland water bodies has increased to roughly 0.2 ZJ since 1960. For permafrost thawing, it was about 2 ZJ.
    • The accumulation of heat in inland water increases lake water temperatures, making conditions ripe for algal blooms.
    • Permafrost heat content could inject methane and carbon dioxide into the atmosphere, the researchers warned.

    (3) Ocean and Troposphere heating

    • The upper ocean (0-300 and 0-700 meters depth) has taken up a major fraction of heat, according to the new estimates.
    • During 2006-2020, ocean warming rates for the 0-2,000 meters depth reached record rates of roughly 1.03 watts per square meter.
    • The troposphere is also warming up due to increased heat accumulation.

    (4) Cryosphere heating

    • The cryosphere – the frozen water part of the Earth system – gained roughly 14 ZJ of heat from 1971-2020.
    • Half of the uptake triggered the melting of grounded ice, while the remaining half is linked to the melting of floating ice.
    • The Antarctic Ice Sheet contributed about 33% to the total cryosphere heat gain, while Arctic sea ice stood second, having contributed 26%.

     

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