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GS Paper: GS3-18.Conservation, Environmental Pollution and Degradation, Environmental Impact Assessment.

  • Bonn meet

    Context

    From June 6-16, representatives from more than 100 countries descended on Bonn to hold preliminary discussions on what could be the final communiqué at the conclusion of COP27, to be held at Sharm-el-Sheikh later this year.

    Key takeaways from the discussion

    • Centred on climate finance: Discussions were centred around climate finance and there was hardly any convergence of issues.
    • No convergence: The developed and developing countries or for that matter, big polluters and small polluters, were speaking from the ends of the spectrum with no meeting ground.
    • Focus on adaptation and mitigation: Much of the discussion was around “loss and damage”, which was being experienced by many of the smaller countries, especially with big coastlines, due to rising river levels, loss of agricultural productivity, loss of livelihoods, etc.
    • The idea to provide assistance for “loss and damage” was opposed by the US and the EU.
    • Need for alternative funding: The Green Climate Fund is considered too cumbersome and the process too lengthy.
    • Hence, the need for an alternate funding route was imperative.
    • It was argued that one needs to look into this issue right now and provide financial assistance to cope with it.
    • This brings into focus the debate between adaptation and mitigation.
    • The demand of the developing countries for a provision of climate finance at a scale much higher than $100 billion a year fell on deaf ears.
    • Incidentally, the figure of $100 billion was arrived at arbitrarily and that too way back in 2009.

    Mitigation Vs Adaptation debate

    • More funding directed toward mitigation: It is generally felt that whatever funding has come for climate change issues has mostly been directed towards mitigation.
    • This is primarily because mitigation projects have a cost-benefit analysis and, therefore, it is easy to lend money because you can get it back through interest payments.
    • Cost-benefit analysis: This is primarily because mitigation projects have a cost-benefit analysis and, therefore, it is easy to lend money because you can get it back through interest payments.
    • Mitigation would mean, for example, setting up solar generation units to avoid carbon footprint.
    • Cost-benefit analysis is difficult for adaptation projects, which would be in the form of grants.

    Actions needed to limit the temperature rise to 1.5 degree Celsius

    • 2.4°C by NDC: The Nationally Determined Contributions (NDCs), as on date, are good enough to limit temperature rise to 2.4 degrees centigrade, provided all the targets are met.
    • 1.8°C with net-zero commitment: In addition, if countries also meet their net-zero commitments by 2050, the temperature rise will still be around 1.8 degrees centigrade.
    • 1.5°C:  To limit the temperature rise to 1.5 degrees centigrade, emissions will have to be cut down by half by 2030.
    • The Alliance of Small Island States (AOSIS) expressed the view that to be more meaningful, the aim should be to reduce emissions by 20 per cent by 2025 itself.
    • The logic is that the next round of NDCs is due only in 2025 and by that time, it would be too late to formulate a plan that is achievable by 2030.

    Issue of using remaining carbon space

    • The use of the remaining carbon space available to limit temperature rise to 1.5 degrees centigrade, a highly contentious issue, was also discussed in Bonn.
    • The US resisted being labelled as a “big emitter” and was not willing to take responsibility for its historical emissions.
    • There is no single estimate of how much carbon space is really available as on date, but broad indications are that at the given emissions rate, it would be roughly 10 years.
    • The raging debate is how to distribute this available space equitably amongst countries, which would mean that someone has to take the burden of stiffer targets.
    • What the US wanted other big emitters like China and India take on greater responsibilities for cutting down emissions.
    • However, the like-minded group of developing countries (LMDCs) — which included China, India, Saudi Arabia and the Arab countries — were opposed to this.

    Conclusion

    If there was any hope that discussions at Bonn would provide an acceptable draft, which could be taken forward during COP27, it was misplaced.

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    Back2Basics: The Paris Agreement

    • 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.
    • To achieve this long-term temperature goal, countries aim to reach global peaking of greenhouse gas emissions as soon as possible to achieve a climate-neutral world by mid-century.
    • It is a landmark process because, for the first time, a binding agreement brings all nations into a common cause to undertake ambitious efforts to combat climate change and adapt to its effects.
    • Implementation of the Paris Agreement requires economic and social transformation, based on the best available science.
    • The Agreement works on a 5- year cycle of increasingly ambitious climate action carried out by countries.
    • By 2020, countries submit their plans for climate action known as nationally determined contributions (NDCs).

    NDCs

    • In their NDCs, countries communicate actions they will take to reduce their Greenhouse Gas emissions in order to reach the goals of the Paris Agreement.
    • Countries also communicate in the NDCs actions they will take to build resilience to adapt to the impacts of rising temperatures.
  • Species in news: Kannimara Teak

    The legendary Kannimara teak of the Parambikulam Tiger Reserve is still growing in height and girth.

    What is the news?

    • Over the last five years, the centuries-old teak has grown by 1.85 metres in height and 9 cm in girth.
    • This might be one of the largest and oldest teak tree in the world.

    Kannimara teak

    • Worshipped by the tribes of Parambikulam, the Kannimara teak remains a flagship of the tiger reserve offering a spectacular view to visitors.
    • For the tribespeople of Parambikulam, it is still a ‘virgin tree’.
    • That was why they named it Kannimara (meaning virgin tree).
    • The tribal legend has it that the tree had bled when people tried to cut it.
    • So they protected it and started worshipping the tree by offering annual pujas.
    • The Kannimara tree had won the Union government’s Mahavriksha Puraskar in its first year of introduction in 1994.

     

     

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  • Proposed Amendments to the Environment (Protection) Act, 1986

    The Ministry of Environment, Forest and Climate Change (MoEFCC), put out a note, proposing amendments in the Environment (Protection) Act, 1986.

    Environment Protection Act (EPA), 1986

    • EP Act was passed under Article 253 of the Constitution, which empowers the Centre to enact laws to give effect to international agreements signed by the country.
    • The purpose of the Act is to implement the decisions of the UN Conference on the Human Environment.
    • They relate to the protection and improvement of the human environment and the prevention of hazards to human beings, other living creatures, plants and property.
    • It was enacted in 1986 on the backdrop of Bhopal Gas Tragedy.
    • The Act was last amended in 1991.

    Why this Act?

    • The Act is an “umbrella” legislation that has provided a framework for the environmental regulation regime in India.
    • It covers all major industrial and infrastructure activities and prohibits and regulates specific activities in coastal areas and eco-sensitive areas.
    • The Act also provides for coordination of the activities of various central and state authorities established under other environment-related laws, such as the Water Act and the Air Act.

    What are the proposed amendments?

    • The Environment Ministry has proposed amendments in four key legislations:
    1. Environment (Protection) Act, 1986
    2. Water (Prevention and Control of Pollution) Act, 1974
    3. Air (Prevention and Control of Pollution) Act, 1981 and
    4. Public Liability Insurance (PLI) Act, 1991
    • These are the cornerstone environmental laws that led to the setting up of the Central Pollution Control Board (CPCB).
    • These laws empowered the CPCB to take criminal action against individuals and corporate bodies who pollute air, water and land.

    Powers given to CPCB by these Laws

    • The clutch of laws currently empowers the CPCB to either:
    1. Shut down a polluting industrial body or
    2. Imprison executives of an organization found to be environmental violators
    • The EPA currently says that violators face imprisonment up to five years or a fine up to ₹1 lakh or both.
    • There’s also a provision for the jail term to extend to seven years.

    Purpose of the Amendments

    • The Environment Ministry had received suggestions to decriminalise existing provisions of the EPA to weed out “fear of imprisonment for simple violations.”
    • These, however, don’t apply to violations that cause grave injury or loss of life.

    How will violators be punished?

    • The changes proposed include the appointment of an ‘adjudication officer’.
    • He/She will decide on the penalty in cases of environmental violations such as reports not being submitted or information not provided when demanded.
    • Funds collected as penalties would be accrued in an “Environmental Protection Fund.”
    • In case of contraventions of the Act, the penalties could extend to anywhere from 5 lakh to 5 crore, the proposal notes.

    Need for such amendments

    • Limited success of existing laws: The history of environmental action and its success in India shows that the current laws have had limited effectiveness.
    • Backlog of cases: An analysis by the Centre for Science and Environment found that Indian courts took between 9-33 years to clear a backlog of cases for environmental violations.
    • Capitalist power: Myriad challenges dogged the process of bringing violators to book.
    • Red tapism: Flag pollution from an industrial unit would mean filing a complaint with the court of the concerned DM, or furnishing evidence to the CPCB which would again have to approach the same institution.
    • Burden of proof: In most cases, it was practically impossible to hold a specific individual in an organization responsible for a specific crime given the burden of proof required.

     

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  • Places in news: Singalila National Park

    The Singalila National Park, the highest protected area in West Bengal, will soon wild Red Panda.

    Singalila National Park

    • Singalila National Park is located on the Singalila Ridge at an altitude of more than 7000 feet above sea level, in the Darjeeling district of West Bengal.
    • It is well known for the trekking route to Sandakphu that runs through it.
    • The Singalila area in Darjeeling was purchased by the British Government from Sikkim Durbar in 1882, and notified a Reserve Forest under the Indian Forest Act 1878.
    • It was notified as a National Park in 1992 and was also officially opened up for tourism.

    Why introduce Red Panda?

    • The number of red pandas has been declining in the wild, even in the Singalila and Neora Valley National Parks, the two protected areas where the mammal is found in the wild in West Bengal.
    • Recent studies estimate that there are 38 of them in Singalila and 32 in Neora.
    • The zoological park who is at the centre of the Red Panda Augmentation Programme.
    • Conservation breeding of red pandas is only one part of the programme.

    About Red Panda

    IUCN Red List: Endangered

    • The red panda (Ailurus fulgens), also known as the lesser panda, is a small mammal native to the eastern Himalayas and southwestern China.
    • It was first formally described in 1825.
    • The red panda inhabits coniferous forests as well as temperate broadleaf and mixed forests, favouring steep slopes with dense bamboo cover close to water sources.
    • It is solitary and largely arboreal.
    • It feeds mainly on bamboo shoots and leaves, but also on fruits and blossoms.

     

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  • Forest Rights Act 2006

    The Odisha government is chasing an ambitious target of completing the implementation of the Forest Rights Act (FRA) by granting all kinds of rights mandated under the historic Act by 2024.

    What is Forest Rights Act (FRA)?

    • The symbiotic relationship between forests and forest-dwelling communities found recognition in the National Forest Policy, 1988.
    • The policy called for the need to associate tribal people in the protection, regeneration and development of forests.
    • The Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, 2006, was enacted in this regard.
    • It aimed to protect the marginalised socio-economic class of citizens and balance the right to environment with their right to life and livelihood.

    Provisions of the 2006 Act

    • The Act recognizes that tribal and other traditional forest-dwelling communities would be hard put to provide documentary evidence for their claims.
    • Rule 13 of the Act, therefore, stipulates that the Gram Sabhas should consider more than one evidence in determining forest rights.
    • The rule sanctions a wide range of evidence, including “statements by village elders”, “community rights” and “physical attributes such as houses, huts and permanent improvements made to land such as levelling, bunds and check dams”.

    Why in news now?

    • The forest rights claims of these tribes and forest-dwellers are mostly rejected by the States.
    • Being poor and illiterate, living in remote areas, they do not know the appropriate procedure for filing claims.
    • The gram sabhas, which initiate the verification of their claims, are low on awareness of how to deal with them.

    Why are forest rights important for tribals?

    • Aimed at undoing the “historic injustice” meted out to forest-dependent communities due to curtailment of their customary rights over forests, the FRA came into force in 2008.
    • It is important as it recognises the community’s right to use, manage and conserve forest resources, and to legally hold forest land that these communities have used for cultivation and residence.
    • It also underlines the integral role that forest dwellers play in the sustainability of forests and in the conservation of biodiversity.
    • It is of greater significance inside protected forests like national parks, sanctuaries and tiger reserves as traditional dwellers then become a part of management of the protected forests.

     

    Try answering this PYQ

    Q.Under the Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, 2006, who shall be the authority to initiate the process for determining the nature and extent of individual or community forest rights or both?

    (a) State Forest Department

    (b) District Collector/Deputy Commissioner

    (c) Tahsildar/Block Development Officer/Mandal Revenue Officer

    (d) Gram Sabha

     

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  • Making sense of Assam floods

    Context

    This year’s floods in Assam have been merciless. In many parts of the state, both rural and urban, shoals of water drove people from their homes and forced many of them to seek shelter for their livestock.

    Understanding the reasons for massive flood in Assam this year

    • The Bay has a major influence on the monsoon in Northeast India.
    • Two coupled ocean-atmosphere phenomena, one from the distant Pacific, La Niña and another in the tropical Indian Ocean, a negative dipole condition, combined to create high rainfall in the Bay of Bengal.
    • To add to that, a warmer atmosphere because of climate change can hold more moisture leading to intense bouts of rain.
    • Apart from embankment failures, a number of unofficial and media reports suggest that the devastation in the floodplains is also a consequence of the way the dams and reservoirs are operated.
    • This indicates that environmental factors unique to each locality are responsible for the floods.
    • The flooding pattern is usually repeated year-to-year. However, at times, this pattern is disturbed — this year for example.
    • The incidence of such megafloods depends on several variables like unusually high rainfall and the failure of critical embankments.

    Role of floods in the making of the floodplain environment and ecology

    • Rejuvenation of ecosystem: Floods cause disruption and damage but they also generate a bounty of fish and rejuvenate flood-plain ecosystems all along the Brahmaputra, including in the Kaziranga.
    • Landscape: This landscape has been shaped over millions of years with the help of an active monsoonal environment and mighty rivers that carry sediments weathered from the still-rising Himalaya.
    • Every year, the Brahmaputra and its tributaries — which are at the centre of Assam’s environment — transport billions of tonnes of sediment, mainly from the Eastern Himalaya, making the landscape volatile.
    • Flooding helps release waters to surrounding land and distribute sediments and nutrients across the floodplains and wetlands.

    How human presence has influenced floodplains

    • As the human footprint intensified on the floodplains, the landscape was increasingly “developed and engineered”.
    • The engineered and planned landscape has affected the floodplains in two ways: It has undermined their ability to store and absorb water and reduced their capacity to transport sediment.
    • Urban floods: This year’s floods took an especially worrying proportion in several urban areas.
    • Guwahati has historically been a lowland and the city has been uniquely shaped by three hills that accumulate water during the monsoon.
    • Its northern side faces one of the most turbulent rivers in the world.
    • However, extensive swamps, channels and their tributaries worked in tandem to make the place habitable.
    • A transformation, however, took place in the 20th century, especially in the later decades, when these natural features were forced to disappear.
    • From an estimated 11,000 people in 1901, the city now is home to close to 1.1 million people.
    • Such a population increase is bound to have several footfalls and not all of them could have been prevented.
    • What has hit the city hardest is the disappearance of some of its critical environmental features.

    Way forward

    • Human interventions such as dams to “tame” rivers and “stabilise” hydrologically dynamic landscapes and riverscapes should be based on guidelines that account for the environmental conditions in Northeast India, especially the fragile geology, changing rainfall patterns, high seismicity and the risk of landslides.
    • Resilience of people: The rapid transformation in rainfall characteristics and flooding patterns demand building people’s resilience.
    • Reconsider projects: Construction projects that impede the movement of water and sediment across the floodplain must be reconsidered.
    • Use of technology: At the same time, climate-imposed exigencies demand new paradigms of early-warning and response systems and securing livelihoods and economies.

    Conclusion

    Floods have played a key role in Assam’s ecology. But increasing human footprint has affected the ability of flood plains to absorb water and transport sediment.

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  • Environment Protection Act (EPA), 1986

    The Union Environment Ministry proposes to soften the provisions of the EP Act (EPA) by replacing a clause that provides for imprisoning violators with one that only requires them to pay a fine.

    Environment Protection Act (EPA), 1986

    • EP Act was passed under Article 253 of the Constitution, which empowers the Centre to enact laws to give effect to international agreements signed by the country.
    • The purpose of the Act is to implement the decisions of the UN Conference on the Human Environment.
    • They relate to the protection and improvement of the human environment and the prevention of hazards to human beings, other living creatures, plants and property.
    • It was enacted in 1986 on the backdrop of Bhopal Gas Tragedy.
    • The Act was last amended in 1991.

    Why this Act?

    • The Act is an “umbrella” legislation that has provided a framework for the environmental regulation regime in India.
    • It covers all major industrial and infrastructure activities and prohibits and regulates specific activities in coastal areas and eco-sensitive areas.
    • The Act also provides for coordination of the activities of various central and state authorities established under other environment-related laws, such as the Water Act and the Air Act.

    Key provisions

    • The Environment (Protection) Rules lay down procedures for setting standards of emission or discharge of environmental pollutants.
    • The objective of Hazardous Waste (Management and Handling) Rules, 1989 is to control the generation, collection, treatment, import, storage, and handling of hazardous waste.
    • The Manufacture, Storage, and Import of Hazardous Rules define the terms used in this context, and sets up an authority to inspect, once a year.
    • The Cells Rules,1989 were introduced with a view to protect the environment, nature, and health in connection with the application of gene technology and micro-organisms.

     

    Try this PYQ:

    Q. Consider the following statements:

    The Environment Protection Act, 1986 empowers the Government of India to

    1. State the requirement of public participation in the process of environmental protection, and the Procedure and manner in which it sought.
    2. Lay down the standards for emission or discharge of environmental pollutants from various sources.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

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  • Enforcing the Single-Use Plastic Ban

    A ban on the use of single-use plastics that was notified by the Union Environment Ministry on August 2021 came into effect on July 1 this year.

    What is the news?

    • The national and State-level control rooms would be set up to check illegal manufacture, import, stocking, distribution, sale and use of banned single use plastic items.
    • The Plastic Waste Management Amendment Rules, 2021, will also prohibit manufacture, import, stocking, distribution, sale and use of plastic carry bags.
    • This is for plastics having thickness less than 120 microns with effect from December 31, 2022.

    What is Single-Use Plastic?

    • The Centre defines it as an object made of plastic that is intended to be used “only once” before being disposed off or recycled.
    • Single-use plastic items such as these had “low utility and high littering potential,” it noted.

    What is now included in SUPs?

    • For the purposes of the ban, there is a list of 21 items that come under the definition of single-use plastic including ear buds with plastic sticks, plastic sticks for balloons, plastic flags, candy sticks, ice-cream sticks, thermocol for decoration etc.
    • It also includes plates, cups, glasses, cutlery such as forks, spoons, knives, straw, trays, wrapping or packing films around sweet boxes, invitation cards, and cigarette packets, plastic or PVC banners less than 100 microns, stirrers.
    • These objects were listed by the Environment Ministry in August when it notified the Plastic Waste Management Amendment Rules, 2021.

    How will the ban be implemented?

    • So far 32 States/UTs have reportedly constituted a dedicated Task Force to eliminate the use of single-use plastics.
    • Of these 14 states/UTs and 12 Central Ministries, as of March, had developed action plans describing how they would be enforcing this.
    • A few States, for example Maharashtra, already have legislation banning the manufacture and storage of such plastic.
    • But implementing it wasn’t always successful as there was regular supply from States where such bans were not in force.
    • An all-India ban, it’s hoped, would make enforcement more effective.

    Penal provisions

    • According to the Environment Protection (EP) Act, violating the ban could invite “punitive action”.
    • Manufacturers and distributors of single-use plastic goods were directed to have zero inventory by June 30.
    • The EP Act says that violating the ban could invite a five-year imprisonment and a fine of upto ₹1 lakh, or both.
    • If the violations are repeated, it could mean additional fines up to ₹5000 for each day.
    • There are different penalties for companies, organisations, and government departments under the EP Act.

    What is the history of the single use plastic ban in India?

    • The Environment Ministry told the Rajya Sabha last July of its plan to phase out some categories of single use plastic by 2022.
    • A draft outlining the manner in which the ban was to be implemented was issued in March and involved amending the PWM Rules, 2016.
    • Before the amendments came into force, the Rules only prohibited the manufacture, import, stocking, distribution, sale and use of carry bags and plastic sheets less than 50 microns in thickness in the country.
    • There is a ban on sachets using plastic material used for storing, packing or selling gutkha, tobacco and pan masala.
    • Since October 2021, there is a ban on carry bags made of virgin or recycled plastic less than 75 microns as opposed to 50 microns under the earlier version of the rules.

    Is there popular support for the ban?

    • The All India Plastic Manufacturers Association has said that the ban would shutter 88,000 units in the plastic manufacturing business.
    • These employ close to a million people and contribute to exports worth ₹25,000 crore.
    • Fast Moving Consumer Goods companies (FMCG) would be severely affected by the the ban due to their dependence on plastic straws, plates.
    • Their replacements, industry representatives say, are available but cost much more than their plastic alternatives.
    • There is also limited capacity in India to provide biodegradable replacements.

    What is the environmental damage from SUPs?

    • Unlike thicker and denser plastic material, single-use plastic objects being light and flexible are less amenable to being recycled.
    • While 99% of plastic is recycled, they constitute heavier plastics that are likely to be collected by ragpickers and plastic waste recyclers.
    • Single use plastics do not provide an incentive enough for the effort needed to collect them and hence they lie around, leach their toxins into the soil and cause environmental damage in both land and sea.

     

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  • Species in news: Chenkurinji

    This newscard is an excerpt from the original article published in The Hindu.

    Chenkurinji

    • Chenkurinji (Gluta travancorica) is a species endemic to the Agasthyamala Biosphere Reserve.
    • Belonging to the Anacardiaceae family, the tree was once abundant in the hills on the southern parts of the Aryankavu Pass in Kerala’s Kollam district.
    • The Shendurney Wildlife Sanctuary derives its name Chenkurinji (Gluta travancorica), a species endemic to the Agasthyamala Biosphere Reserve.

    Why in news?

    • It is very susceptible to climate change and the present condition of the species is quite bad with low regeneration performance.
    • Though there are seemingly enough number of the tree, most are not productive, generating a negative trend in its population.
    • The majority of the trees is old with poor flowering and fruiting rates.
    • Though the flowering usually happens in January, of late, the species has reported a tendency to extend the process due to climate change.

    Significance of Chenkurinji

    • It is reported to have medicinal properties and is used to lower blood pressure and treat arthritis.

     

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  • Four new corals recorded from Indian waters

    Scientists have recorded four species of corals for the first time from Indian waters. These new species of azooxanthellate corals were found from the waters off the Andaman and Nicobar Islands.

    What are Azooxanthellate Corals?

    • The azooxanthellate corals are a group of corals that do not contain zooxanthellae and derive nourishment not from the sun but from capturing different forms of planktons.
    • They are deep-sea representatives with the majority of species being reported from depths between 200 metres and 1,000 metres.
    • They are also reported from shallow waters unlike zooxanthellate corals that are restricted to shallow waters.

    Which are the news species found?

    • Truncatoflabellum crassum, T. incrustatum, T. aculeatum, and T. irregulare under the family Flabellidae were previously found in Japan, the Philippines and Australian waters.
    • Only T. crassum was reported with the range of Indo-West Pacific distribution.

    Significance of the discovery

    • Most studies of hard corals in India have been concentrated on reef-building corals while much is not known about non-reef-building corals.
    • These new species enhance our knowledge about non-reef-building solitary corals.

    Back2Basics: 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 they 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.

     

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