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Subject: Climate Change

1. Global Warming and Issues
2. All about Pollution

  • What is Stockholm+50?

    Stockholm+50 conference — a follow-on to the 1972 conference to be held in Stockholm from 2-3 June 2022 is the one that started the environmental movement we see today.

    What is Stockholm +50?

    • Stockholm +50 is an international environmental meeting hosted by the United Nations General Assembly to be held in Stockholm, Sweden from 2-3 June 2022.
    • The theme of Stockholm+50 is “a healthy planet for the prosperity of all – our responsibility, our opportunity.
    • In 1972, the UN Conference on the Environment in Stockholm was held, and it was essentially the first conference that managed to address environmental issues on the right level.
    • Fifty years later, the United Nations is back in Stockholm to commemorate that important milestone.

    Significance: Establishment of UNEP

    • In 1972, some 122 countries attended, and participants adopted a series of principles on the environment, including the Stockholm Declaration and Action Plan for the Human Environment.
    • The United Nations Environment Programme (UNEP) was created as a result of the conference.

    What is India’s connection with this?

    • Then Prime Minister Indira Gandhi in her seminal speech in the conference brought forward the connection between ecological management and poverty alleviation.
    • Her call remains as pertinent now as then: “We have to prove to the disinherited majority of the world that ecology and conservation will not work against their interest but will bring an improvement in their lives.”

    Why is Stockholm +50 important?

    • There was a lot of media attention around COP26 last year where world leaders gathered to continue the work to uphold the actions promised by the Paris Agreement, 2015.
    • Later this year, there will be COP27 in Egypt, where organizers will aim to make the conference a radical turning point in international climate efforts.

    What will be happening at Stockholm +50?

    • The event in the beginning of June will see representatives from around the world gather in Stockholm to discuss how to achieve a sustainable and inclusive future for all.
    • Stockholm +50 could usher in a much-needed new boost to environmental awareness and action for the next half-century, just as it did five decades ago.

     

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  • What are Urban Heat Islands?

    Several parts of the country are reeling under heat wave conditions. Cities, especially, are a lot hotter than rural areas. This is due to a phenomenon called an “urban heat island”.

    Urban Heat Island

    • An urban heat island is a local and temporary phenomenon experienced when certain pockets within a city experience higher heat load than surrounding or neighbouring areas on the same day.
    • The variations are mainly due to heat remaining trapped within locations that often resemble concrete jungles.
    • The temperature variation can range between 3 to 5 degrees Celsius.

    Why are cities hotter than rural areas?

    • Green cover: Rural areas have relatively larger green cover in the form of plantations, farmlands, forests and trees as compared to urban spaces.
    • Transpiration: Transpiration is a natural way of heat regulation. This is the scientific process of roots absorbing water from the soil, storing it in the leaves and stems of plants, before processing it and releasing it in the form of water vapour.
    • Heat-regulation: Urban areas are often developed with high-rise buildings, roads, parking spaces, pavements and transit routes for public transport. As a result, heat regulation is either completely absent or man-made.
    • Construction: Cities usually have buildings constructed with glass, bricks, cement and concrete all of which are dark-coloured materials, meaning they attract and absorb higher heat content.

    This forms temporary islands within cities where the heat remains trapped.

    How can urban heat islands be reduced?

    • The main way to cut heat load within urban areas is increasing the green cover; filling open spaces with trees and plants.
    • Other ways of heat mitigation include appropriate choice of construction materials, promoting terrace and kitchen gardens, and painting white or light colours on terraces wherever possible to reflect heat.

    What has NASA said on urban heat islands in India?

    • NASA recently pointed out heat islands in urban parts of Delhi, where temperatures were far higher than nearby agricultural lands.
    • It used its Ecosystem Spaceborne Thermal Radiometer Experiment (Ecostress) on the International Space Station.

     

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  • Is La Nina a fair weather friend of our country?

    This year the La Nina is being blamed for worsening the longest spell of heatwaves from March to April in north, west and Central India.

    In most years, meteorologists considered the La Nina to be a friend of India.

    What is El Nino and La Nina?

    • While El Niño (Spanish for ‘little boy’), the more common expression, is the abnormal surface warming observed along the eastern and central regions of the Pacific Ocean (the region between Peru and Papua New Guinea).
    • The La Niña (Spanish for ‘little girl’) is an abnormal cooling of these surface waters.
    • Together, the El Niño (Warm Phase) and La Niña (Cool Phase) phenomena are termed as El Niño Southern Oscillation (ENSO).
    • These are large-scale ocean phenomena which influence the global weather — winds, temperature and rainfall. They have the ability to trigger extreme weather events like droughts, floods, hot and cold conditions, globally.
    • Each cycle can last anywhere between 9 to 12 months, at times extendable to 18 months — and re-occur after every three to five years.
    • Meteorologists record the sea surface temperatures for four different regions, known as Niño regions, along this equatorial belt.
    • Depending on the temperatures, they forecast either as an El Niño, an ENSO neutral phase, or a La Niña.

    Impact on India

    • El Nino during winter causes warm conditions over the Indian subcontinent and during summer, it leads to dry conditions and deficient monsoon.
    • Whereas La Nina results in better than normal monsoon in India.
    • It has been established that Indian summer monsoon is a fully coupled land-atmosphere-ocean system and that it is linked to ocean temperature variability.
    • In an agricultural country like India, the extreme departure from normal seasonal rainfall seriously affects the agricultural output and thus the economy of the country.

    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=”54futt6vd2″ question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

     

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  • India must use markets to decarbonise

    Context

    Climate change is bound to impact human lives and the global economy at an exceptionally high scale in the not-so-distant future. The solution to the problem calls for government intervention.

    Carbon intensive nature of India’s energy ecosystem

    • After China and the United States, India, which releases 2.44 billion tonnes of carbon dioxide annually, is the third-largest emitter of this GHG, making it a key player in emissions reduction.
    •  The International Energy Agency’s (IEA) World Energy Outlook 2017 Report estimates that India will account for nearly one-fourth of the global energy demand by 2040.
    • As per the IEA’s India Energy Outlook 2021 Report, India’s energy system is highly dependent on fossil fuels — coal, oil and bioenergy — that supply about 90 per cent of the country’s demand.
    • Low electrification: About 38 per cent of primary energy is consumed for power generation, implying that the level of electrification is still low in the country.
    • Power generation is highly dependent on coal — about 78 per cent of it comes from this fossil fuel — and, transportation is almost entirely dependent on oil.
    • The Indian energy ecosystem is, thus, highly carbon-intensive.

    Climate change as a feature of market failure

    • Market failure due to climate change: Economic activities by consumers (driving or air-conditioning, for instance) and by producers (such as electricity generation and manufacturing) cause emissions, leading to pollution and global warming.
    • Negative externalities: These negative externalities, causing outcomes that are not efficient, are not reflected in the costs incurred by consumers or producers.
    • The true costs to the consumers, producers and society are not reflected in the market interactions.
    • This leads to an uncontrolled rise in emissions and also breeds apathy towards mitigation efforts.

    Way forward

    • Government intervention: Achieving economic growth sustainably requires a strategy for reducing carbon emissions aggressively while also focusing on efficiency, equity, fairness and behavioural aspects.
    • The solution to the problem of market failure calls for government intervention.
    • Limits of emission: The most natural option of government intervention for reducing emissions is by fixing limits of emissions through regulation, taking into consideration the Nationally Determined Contribution targets set by the country under the Paris Agreement.
    • Experts have shown that the wrongly set emission levels could lead to cost-inefficient outcomes.
    • It makes it difficult for the regulator to obtain the information about each firm’s abatement-cost and damage-cost schedules in advance.
    • Therefore, setting emission targets and regulating emissions through command and control might be good only during the initial phase of the mitigation strategy.
    • Why Carbon tax is a better option? The carbon tax is a better option than regulating the pre-fixed levels of emissions.
    • The marginal cost of abatement rises as the firms keep on reducing the emissions further, and the firm will stop reducing emissions and choose to pay tax at the point when the cost of abatement becomes higher than the rate of tax.
    • This option will lead to near-efficient outcomes.
    •  The trading scheme will bring in higher efficiency as the price of certificates will be determined by allowing firms facing low and high abatement costs to compete in the free market as per their own abatement and damage cost schedules.
    •  The emissions trading scheme will determine the optimal and cost-efficient levels of emissions reduction by providing a choice to the firms to either mitigate or trade — the net effect of this will be a reduction in emissions.
    • The low abatement-cost firms will keep reducing emissions as they would profit by trading the certificates.
    • Equity in energy access: The issue of equity in energy access must be addressed by channelling the revenues generated from carbon pricing to households and firms impacted by the carbon trading and carbon tax — these could be through incentives or lump-sum transfers.

    Conclusion

    The socio-economic impact of decarbonising the economy and the way humans live would be crucial in setting our priorities. We have limited time and our resources are scarce.

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  • What are Heatwaves?

    India is gripped in the wrath of a long spell of heatwaves that too in the early month of April.

    What is a Heatwave and when is it declared?

    • Heatwaves occur over India between March and June.
    • IMD declares a heatwave event when the maximum (day) temperature for a location in the plains crosses 40 degrees Celsius.
    • Over the hills, the threshold temperature is 30 degrees Celsius.

    How are they formed?

    • Heatwaves form when high pressure aloft (3,000–7,600 metres) strengthens and remains over a region for several days up to several weeks.
    • This is common in summer (in both Northern and Southern Hemispheres) as the jet stream ‘follows the sun’.
    • On the equator side of the jet stream, in the upper layers of the atmosphere, is the high pressure area.
    • Summertime weather patterns are generally slower to change than in winter. As a result, this upper level high pressure also moves slowly.
    • Under high pressure, the air subsides (sinks) toward the surface, warming and drying adiabatically, inhibiting convection and preventing the formation of clouds.
    • Reduction of clouds increases shortwave radiation reaching the surface.
    • A low pressure at the surface leads to surface wind from lower latitudes that brings warm air, enhancing the warming.
    • Alternatively, the surface winds could blow from the hot continental interior towards the coastal zone, leading to heat waves.

    Following criteria are used to declare heatwave:

    To declare heatwave, the below criteria should be met at least in 2 stations in a Meteorological subdivision for at least two consecutive days and it will be declared on the second day.

    1. a) Based on Departure from Normal
    • Heat Wave: Departure from normal is 4.5°C to 6.4°C
    • Severe Heat Wave: Departure from normal is >6.4°C
    1. b) Based on Actual Maximum Temperature (for plains only)
    • Heat Wave: When actual maximum temperature ≄ 45°C
    • Severe Heat Wave: When actual maximum temperature ≄47°C

    How long can a heatwave spell last?

    • A heatwave spell generally lasts for a minimum of four days. On some occasions, it can extend up to seven or ten days.
    • The longest recorded heatwave spell, in recent years, was between 18 and 31 May 2015.

    Impact of Heat Waves:

    Heat Strokes: The very high temperatures or humid conditions pose an elevated risk of heat stroke or heat exhaustion.

    Older people and people with chronic illness such as heart disease, respiratory disease, and diabetes are more susceptible to heatstroke, as the body’s ability to regulate heat deteriorates with age.

    Increased Healthcare Costs: Effects from extreme heat are also associated with increased hospitalisations and emergency room visits, increased deaths from cardio-respiratory and other diseases, mental health issues, adverse pregnancy and birth outcomes, etc.

    Lessens Workers’ Productivity: Extreme heat also lessens worker productivity, especially among the more than 1 billion workers who are exposed to high heat on a regular basis. These workers often report reduced work output due to heat stress.

    Risk of Wildfires: The heat domes act as fuel to wildfires, which destroys a lot of land area every year in countries like the US.

    Prevents Cloud Formation: The condition also prevents clouds from forming, allowing for more radiation from the sun to hit the ground.

    Effect on Vegetation: The trapping of heat can also damage crops, dry out vegetation and result in droughts.

    Increased Energy Demands: The sweltering heat wave also leads to rise in energy demand, especially electricity, leading to pushing up rates.

    Power Related Issues: Heat waves are often high mortality disasters.

    Avoiding heat-related disasters depends on the resilience of the electrical grid, which can fail if electricity demand due to air conditioning use exceeds supply.

    As a result, there is the double risk of infrastructure failure and health impacts.

    • Initiatives Taken:
      • Global:
        • Global forums dealing with climate change issues—such as the World Health Organization, World Economic Forum, First Global Forum on Heat and Health, and the Global Forum for Environment-OECD—also focus on heat waves by investing in research on health risks of extreme heat, climate and weather information, advice on surviving heat waves, partnerships and capacity building, and communications and outreach.
      • Indian:
        • The National Disaster Management Authority (NDMA) has issued guidelines on dealing with heatwaves.
          • However, India does not recognise heatwaves as a disasterunder its Disaster Management Act (2005).

    Way Forward

    • Adopting A More Sensitive Approach: The impact of such excessive heat needs to be understood from the point of view of common people — daily labourers; farmers; traders; fishermen etc.
      • Beyond numbers and graphs that capture the impact of the climate crisis, the human experience of living in oppressive heat needs to be understood by policymakers and measures should be taken accordingly.
    • Cooling Shelters: The government should come out with a policy to deal with the suffering and disability caused by heat extremes in different parts of the country.
      • Water kiosks, staggered outdoor work hours, cool roofs for buildings and homes are certain things that should be put in place immediately.
      • A number of emergency cooling shelters can be opened so that people without domestic air conditioning units can escape the heat.
        • Portable air-conditioning units, along with fans and even ice are also useful.
    • Passive Cooling to Reduce Urban Heat Islands: Passive cooling technology, a widely-used strategy to create naturally ventilated buildings, can be a vital alternative to address the urban heat island for residential and commercial buildings.
      • The IPCC report cites ancient Indian building designs that have used this technology, which could be adapted to modern facilities in the context of global warming.
    • Action Plans Similar to Ahmedabad: As per the IPCC Report, Ahmedabad has shown the way to combat heat extremes by heat-proofing buildings.
      • After the heat action plan was implemented in 2013 in Ahmedabad, heat-related mortality reduced by 30% to 40% over the years. Similar plans like that of Ahmedabad can be implemented in vulnerable regions.
    • Replacing Dark Roofs: A big reason that cities are so much hotter than rural areas is that they are covered by dark roofs, roads and parking lots that absorb and retain heat.
      • One of the long term solutions can be replacing the dark surfaces with lighter and more reflective materials; it will result in a comparatively cooler environment.

     

     

  • Palli in Jammu becomes India’s First Carbon-Neutral Panchayat

    Palli village in Samba district of Jammu and Kashmir has become the first panchayat in the country to become carbon-neutral, fully powered by solar energy.

    Various feats achieved

    • All its records have been digitised and the benefits of all the Central schemes are available in this village around 17 km from Jammu.
    • Palli village, with its enthusiastic and dedicated elected representatives full of dreams, has shown how to implement the Glasgow pledge (Panchamrita) made by PM Modi.
    • It has set an example of the slogan Sabka Prayas (everyone’s efforts).

    What is Carbon Neutrality?

    • Carbon neutrality refers to achieving net-zero carbon dioxide emissions or buying enough carbon credits to make up the difference.
    • This can be done by balancing emissions of carbon dioxide with its removal (often through carbon offsetting) or by eliminating emissions from society.
    •  It is used in the context of carbon dioxide-releasing processes associated with transportation, energy production, agriculture, and industry.
    •  The term carbon neutral also includes other greenhouse gases, usually carbon-based, measured in terms of their carbon dioxide equivalence.
    • The term “net-zero” is increasingly used to describe a broader and more comprehensive commitment to decarbonization and climate action.
    • Net-zero emissions are achieved when your organization’s emissions of all greenhouse gases (CO2-e) are balanced by greenhouse gas removals

    Methodology

    Carbon-neutral status can be achieved in two ways:

    • Carbon offsetting: Balancing carbon dioxide emissions with carbon offsets — the process of reducing or avoiding greenhouse gas emissions or removing carbon dioxide from the atmosphere to make up for emissions elsewhere. If the total greenhouse gasses emitted is equal to the total amount avoided or removed, then the two effects cancel each other out and the net emissions are ‘neutral’.
    • Reducing emissions: Reducing carbon emissions can be done by moving towards energy sources and industrial processes that produce fewer greenhouse gases, thereby transitioning to a low-carbon economy. Shifting towards the use of renewable energy such as hydro, wind, geothermal, and solar power, as well as nuclear power, reduces greenhouse gas emissions.

    Agreement and Target

    • The Paris Agreement is a legally binding international treaty on climate change. It was adopted by 196 Parties at COP 21 in Paris, on 12 December 2015 and entered into force on 4 November 2016.
    • Its goal is to limit global warming to well below 2, preferably to 1.5 degrees Celsius, compared to pre-industrial levels.
    • Article 4.1 of the Paris Agreement asks countries to reach global peaking of greenhouse gas emissions as soon as possible.
    • It also requires countries to undertake rapid reductions in carbon emissions to achieve a balance between anthropogenic emissions by sources and removals by sinks of greenhouse gases.

    Back2Basics:  Panchamrita

    • ‘Panchamrita’ is a traditional method of mixing five natural foods — milk, ghee, curd, honey, and jaggery.
    • These are used in Hindu and Jain worship rituals. It is also used as a technique in Ayurveda.
    • The PM euphemistically termed his scheme as ‘Panchamrita’ meaning the ‘five ambrosia’.
    • Under Panchamrita’, India will:
    1. Get its non-fossil energy capacity to 500 gigawatts by 2030
    2. Meet 50 percent of its energy requirements till 2030 with renewable energy
    3. Reduce its projected carbon emission by one billion tonnes by 2030
    4. Reduce the carbon intensity of its economy by 45 percent by 2030
    5. Achieve net-zero by 2070

     

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  • No El Nino expected this year

    The southwest monsoon is likely to be “normal” in 2022, though rainfall in August, the second rainiest month, will likely be subdued, according to the private weather company Skymet.

    El Nino and La Nina

    • While El Niño (Spanish for ‘little boy’), the more common expression, is the abnormal surface warming observed along the eastern and central regions of the Pacific Ocean (the region between Peru and Papua New Guinea).
    • The La Niña (Spanish for ‘little girl’) is an abnormal cooling of these surface waters.
    • Together, the El Niño (Warm Phase) and La Niña (Cool Phase) phenomena are termed as El Niño Southern Oscillation (ENSO).
    • These are large-scale ocean phenomena which influence the global weather — winds, temperature and rainfall. They have the ability to trigger extreme weather events like droughts, floods, hot and cold conditions, globally.
    • Each cycle can last anywhere between 9 to 12 months, at times extendable to 18 months — and re-occur after every three to five years.
    • Meteorologists record the sea surface temperatures for four different regions, known as Niño regions, along this equatorial belt.
    • Depending on the temperatures, they forecast either as an El Niño, an ENSO neutral phase, or a La Niña.

    Impact on India

    • El Nino during winter causes warm conditions over the Indian subcontinent and during summer, it leads to dry conditions and deficient monsoon.
    • Whereas La Nina results in better than normal monsoon in India.
    • It has been established that Indian summer monsoon is a fully coupled land-atmosphere-ocean system and that it is linked to ocean temperature variability.
    • In an agricultural country like India, the extreme departure from normal seasonal rainfall seriously affects the agricultural output and thus the economy of the country.

    Try this PYQ:

    Q. 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=”s79h0abm7h” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

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  • Demand side strategies for climate change mitigation

    Context

    A paradigm shift in the way we think about climate action has been reported for the first time in the recent IPCC report through a chapter on “demand, services and social aspects of mitigation”.

    Demand side strategies and their impact

    • The report shows how, through comprehensive demand-side strategies, carbon dioxide and non-carbon GHG emissions globally can be reduced by 40–70 per cent compared to the 2050 emissions projection.
    • This can be achieved through reduced food waste, following sustainable healthy dietary choices that acknowledge nutritional needs, adaptive heating and cooling, climate-friendly dressing culture, integration of renewable energy in buildings, shifting to electric light-duty vehicles, and to walking, cycling, shared and public transit, sustainable consumption by intensive use of longer-lived repairable products, compact city design and efficient floor area use of buildings.
    • The IPCC report also shows that individuals with high socioeconomic status contribute disproportionately to emissions and have the highest potential for emissions reductions, as citizens, investors, consumers, role models, and professionals.
    • Of the 60 actions assessed in this report, on an individual level, the biggest contribution comes from walking and cycling wherever possible and using electricity-powered transport.

    Need for systemic changes

    • To be effective, these shifts will need to be supported by systemic changes in some areas — for example, land use and urban planning policies to avoid urban sprawl, support for green spaces, reallocation of street spaces for walking and physical exercise, investment in public transport and infrastructure design for active and electric vehicles.
    • Electrification and shifts to public transport also bring benefits in terms of enhancing health, employment, and equality.
    • By providing user-level access to more efficient energy conversion technologies, the need for primary energy can be reduced by 45 per cent by 2050, compared to 2020.
    • Demand-side changes cannot deliver the net-zero goal on their own.
    • But this requires investment in and transformation across every sector, along with policies and incentives that encourage people to make low-carbon choices in all aspects of their lives.
    • There is huge untapped potential in the near term through changes across transport, industry, buildings, and food that will take away the supply-side uncertainties and make it easier for people to lead low-carbon lifestyles and, at the same time, improve well-being.

    Conclusion

    The latest IPCC report puts people and their well-being at the centre of climate change mitigation. The messages are from a global perspective but have relevance to the national context of every country.

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  • Crisis and sustainability in the face of climate change

    Context

    The footprint of the Covid-19 pandemic across the sectors of the economy has instilled a new reckoning for resilience and sustainability on the economic, social and environmental (ESG) front.

    IPCC reports suggest adaption for resilience

    • The Intergovernmental Panel on Climate Change (IPCC) published its latest report on climate impacts, vulnerability and adaptation last month.
    • The report suggests that adaptation to climate impacts in the near to medium term can help communities and ecosystems become resilient against the threats from current and future levels of warming.
    •  Ecosystem-based adaptation, for instance, is recommended for taking care of communities and social well-being, while restoring forests, lands and marine ecosystems.
    • The report details the variability in projected climate impacts and the vulnerabilities that can be expected across regions the world over due to differences in the range of warming, geographical location, demographics and the unique biophysical, social and cultural contexts.
    • Cost-effective adaptation: It depends on a host of enablers on which global partnerships need to deliver.
    • Enablers include international cooperation, inclusive technology, financial flows, knowledge sharing and capacity building, with institutions and innovations to support policy development and on-ground implementation.

    Gaps in the literature, acknowledge the uncertainties in climate science

    • The IPCC has been consistently drawing attention to the lack of adequate science from and on developing countries.
    • These countries have in turn been asking for the inclusion of what is broadly termed as “grey literature” or non-peer-reviewed literature in the IPCC process.
    • Good science encompasses the formal and the informal, theory and empiricism, the traditional along with the modern.
    • It relies on evolution through acknowledging the gaps and unknowns, the negatives and positives of past knowledge.
    • The understanding of adaptation finance, adaptation costing, and mapping of climate impacts and adaptation needs of communities in geographically remote locations, for instance, could improve with suitable sourcing of information.

    Way forward

    • Sustainable development, inclusive of climate resilience, calls for an ensemble approach — one that places contextually appropriate emphasis on tackling climate change impacts and development needs in a world with growing challenges.
    • The pathway to be adopted is one of an integrated risk assessment approach, where solutions are interventions that impact the immediate, near and medium-term outcomes for developing economies.
    • Striking the right balance is at any time a choice driven as much by enablers (capabilities, lifestyles and values, financial flows, technical know-how) as by constraints (warming levels, poverty, inequality, lack of health and education).

    Conclusion

    The pandemic highlighted the need for balance in nature-people relationships, even as it tested the ability of the developing world.

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  • The phenomenon of Coral Bleaching

    The management authority of the world’s largest coral reef system, Australia’s Great Barrier Reef, confirmed on March 25 that the reef is experiencing a mass coral bleaching event.

    What are Coral Reefs?

    • Corals are marine invertebrates or animals not possessing a spine.
    • Each coral is called a polyp and thousands of such polyps live together to form a colony, which grows when polyps multiply to make copies of themselves.
    • Australia’s Great Barrier Reef is the world’s largest reef system stretching across 2,300 km.
    • It hosts 400 different types of coral, gives shelter to 1,500 species of fish and 4,000 types of mollusc.
    • Corals are of two types — hard coral and soft coral:
    1. Hard corals, also called hermatypic or ‘reef building’ corals extract calcium carbonate (also found in limestone) from the seawater to build hard, white coral exoskeletons.
    2. Soft coral polyps, however, borrow their appearance from plants, attach themselves to such skeletons and older skeletons built by their ancestors. Soft corals also add their own skeletons to the hard structure over the years and these growing multiplying structures gradually form coral reefs. They are the largest living structures on the planet.

    How do the feed themselves?

    • Corals share a symbiotic relationship with single-celled algae called zooxanthellae.
    • The algae provides the coral with food and nutrients, which they make through photosynthesis, using the sun’s light.
    • In turn, the corals give the algae a home and key nutrients.
    • The zooxanthellae also give corals their bright colour.

    What is Coral Bleaching?

    • Bleaching happens when corals experience stress in their environment due to changes in temperature, pollution or high levels of ocean acidity.
    • Under stressed conditions, the zooxanthellae or food-producing algae living inside coral polyps start producing reactive oxygen species, which are not beneficial to the corals.
    • So, the corals expel the colour-giving zooxanthellae from their polyps, which exposes their pale white exoskeleton, giving the corals a bleached appearance.
    • This also ends the symbiotic relationship that helps the corals to survive and grow.
    • Severe bleaching and prolonged heat stress in the external environment can lead to coral death.

    Impact of climate change

    • Over the last couple of decades, climate change and increased global warming owing to rising carbon emissions and other greenhouse gases have made seas warmer than usual.
    • Under all positive outlooks and projections in terms of cutting greenhouse gases, sea temperatures are predicted to increase by 1.5°C to 2°C by the time the century nears its end.
    • The first mass bleaching event had occurred in 1998 when the El Niño weather pattern caused sea surfaces in the pacific ocean to heat up; this event caused 8% of the world’s coral to die.
    • The second event took place in 2002.
    • In the past decade, however, mass bleaching occurrences have become more closely spaced in time, with the longest and most damaging bleaching event taking place from 2014 to 2017.

    Significance of Corals

    • Coral reefs support over 25% of marine biodiversity, including fish, turtles and lobsters; even as they only take up 1% of the seafloor.
    • The marine life supported by reefs further fuels global fishing industries. Even giant clams and whales depend on the reefs to live.
    • Besides, coral reef systems generate $2.7 trillion in annual economic value through goods and service trade and tourism.
    • In Australia, the Barrier Reef, in pre-COVID times, generated $4.6 billion annually through tourism and employed over 60,000 people including divers and guides.
    • Aside from adding economic value and being a support system for aquatic life, coral reefs also provide protection from storm waves.
    • Dead reefs can revive over time if there are enough fish species that can graze off the weeds that settle on dead corals, but it takes almost a decade for the reef to start setting up again.

    Current condition of the Great Barrier Reef

    • The United Nations Intergovernmental Panel on Climate Change (IPCC) released its report this month, which warned that the life of the Great Barrier is in grave danger.
    • The report said that if temperatures continue to rise, bleaching events may occur more often and a large proportion of the remaining reef cover in Australia could be lost.
    • Just a couple of weeks after this warning, the Barrier Reef Authority confirmed a mass bleaching phenomenon affecting all pockets of the reef system.

    Try this PYQ:

    Q. Consider the following statements:

    1. Most of the world’s coral reefs are in tropical waters.
    2. More than one third of the world’s coral reefs are located in the territories of Australia, Indonesia and Philippines.
    3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.

    Which of the above statements is/are correct?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1 and 3 only

     

    [wpdiscuz-feedback id=”olp1whi3zk” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

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