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Subject: Environment

  • Hurricane Ida makes landfall in US

    Hurricane Ida has made landfall in Louisiana, US as an extremely dangerous Category 4 storm.

    What is a Hurricane?

    • A hurricane is a tropical cyclone that occurs in the Atlantic Ocean and the northeastern Pacific Ocean.
    • And a typhoon occurs in the northwestern Pacific Ocean; in the south Pacific or the Indian Ocean, comparable storms are referred to simply as “tropical cyclones” or “severe cyclonic storms”.

    What are Tropical Cyclones?

    A Tropical cyclone is an intense circular storm that originates over warm tropical oceans and is characterized by low atmospheric pressure, high winds, and heavy rain.

    • Cyclones are formed over slightly warm ocean waters. The temperature of the top layer of the sea, up to a depth of about 60 meters, need to be at least 28°C to support the formation of a cyclone.
    • This explains why the April-May and October-December periods are conducive for cyclones.
    • Then, the low level of air above the waters needs to have an ‘anticlockwise’ rotation (in the northern hemisphere; clockwise in the southern hemisphere).
    • During these periods, there is an ITCZ in the Bay of Bengal whose southern boundary experiences winds from west to east, while the northern boundary has winds flowing east to west.
    • Once formed, cyclones in this area usually move northwest. As it travels over the sea, the cyclone gathers more moist air from the warm sea which adds to its heft.

    Try this question from CSP 2020:

    Q.Consider the following statements:

    1. Jet Streams occur in the Northern Hemisphere only.
    2. Only some cyclones develop an eye.
    3. The temperature inside the eye of a cyclone is nearly 10 degree Celsius lesser than that of the surroundings.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 and 3 only

    (c) 2 only

    (d) 1 and 3 only

     

    [wpdiscuz-feedback id=”dirx8tck67″ question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

    Destruction caused

    • Strong Winds: Cyclones are known to cause severe damage to infrastructure through high-speed winds.
    • Torrential rains and inland flooding: Torrential rainfall (more than 30 cm/hour) associated with cyclones is another major cause of damages. Unabated rain gives rise to unprecedented floods.
    • Storm Surge: A Storm surge can be defined as an abnormal rise of sea level near the coast caused by a severe tropical cyclone.

    Some (unexpected) benefits

    Although Tropical cyclones are known for the destruction they cause, when they strike they also bestow certain benefits to the climatic conditions of that area such as

    • Relieve drought conditions
    • Carry heat and energy away from the tropics and transport it towards temperate latitudes
    • Maintain a relatively stable and warm temperature worldwide

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    Also read:

    [Burning Issue] Tropical Cyclones and India

  • Places in news: Pantanal Wetlands

    Pantanal, the world’s largest tropical wetlands is facing a severe crisis due to wildfires and climate change.

    Pantanal Wetlands

    • The Pantanal is a natural region encompassing the world’s largest tropical wetland area, and the world’s largest flooded grasslands.
    • It is located mostly within the Brazilian and extends to some portions of Bolivia and Paraguay.
    • It sprawls over an area estimated at between 140,000 and 195,000 square kilometer.
    • Roughly 80% of the Pantanal floodplains are submerged during the rainy seasons, nurturing a biologically diverse collection of aquatic plants and helping to support a dense array of animal species.

    Risks faced

    • Unlike the Amazon rainforest, vegetation in the Pantanal has evolved to coexist with fire — many plant species there require the heat from fires to germinate.
    • Often caused by lightning strikes, those natural fires spring up at the end of the dry season, but the surrounding floodplains prevent them from spreading.
    • What’s different now is the drought, contributing further to the unusually dry conditions and exacerbating the fire risk.

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  • Places in news: Deepar Beel Wildlife Sanctuary

    The Ministry of Environment, Forest and Climate Change has notified the eco-sensitive zone of the Deepar Beel Wildlife Sanctuary on the south-western edge of Guwahati.

    Deepar Beel

    • Deepar Beel is one of the largest freshwater lakes in Assam and the State’s only Ramsar site besides being an Important Bird Area.
    • It is located to the south-west of Guwahati city, in Kamrup Metropolitan district.
    • It is a permanent freshwater lake, in a former channel of the Brahmaputra River, to the south of the main river.
    • It is also called a wetland under the Ramsar Convention which has listed the lake in November 2002, as a Ramsar Site for undertaking conservation measures on the basis of its biological and environmental importance.

    Major threats

    • Deepar Beel has long been used as a sponge for Guwahati’s sewage via a couple of streams.
    • The wetland has also suffered from seepage of toxins from a garbage dump at Boragaon adjoining it.
    • It has for decades been threatened by a railway track — set to be doubled and electrified — on its southern rim, a garbage dump, and encroachment from human habitation and commercial units.
    • The water has become toxic and it has lost many of its aquatic plants that elephants would feed on.

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  • Animal Discoveries 2020 report by ZSI

    India has added 557 new species to its fauna reveals Animal Discoveries 2020, a document published recently by the Zoological Survey of India (ZSI).

    Major species discovered

    The number of faunal species in India has climbed to 1,02,718 species. Among the new species, some interesting species discovered in 2020 are:

    • Trimeresurus salazar, a new species of green pit viper discovered from Arunachal Pradesh;
    • Lycodon deccanensis, the Deccan wolf snake discovered from Karnataka; and
    • Sphaerotheca Bengaluru, a new species of burrowing frog named after the city of Bengaluru.
    • Xyrias anjaalai, a new deep-water species of snake eel from Kerala;
    • Glyptothorax giudikyensis, a new species of catfish from Manipur; and
    • Clyster galateansis, a new species of scarab beetles from the Great Nicobar Biosphere.

    Visitor species

    • Myotis cf. frater, a bat species earlier known from China, Taiwan and Russia, has been reported for the first time from Uttarakhand in India
    • Zoothera citrina gibsonhilli, an orange-headed thrush earlier known from southern Myanmar to south Thailand (central Malay peninsula) was reported for the first time from India based on a collection made from the Narcondam island in the Andaman & Nicobar Islands.

    Significance

    • The ZSI publication shows that India is a mega biodiverse country, rich in biodiversity, with 23.39% of its geographical area under forest and tree cover.
    • India is positioned 8th in mega biodiversity countries in the world with 0.46 BioD index which is calculated by its percentage of species in each group relative to the total global number of species in each group.

    About Zoological Survey of India

    • The ZSI was set up by British zoologist Thomas Nelson Annandale, in 1916.
    • It is the premier taxonomic research organization in India.
    • It was established to promote surveys, exploration and research leading to advancement of our knowledge of various aspects of the exceptionally rich animal life of India.
    • The ZSI had its genesis as the Zoological Section of the Indian Museum at Calcutta in 1875.
    • Since its inception, the ZSI has been documenting the diversity and distribution of the fauna of India towards carrying out its mandate of conducting exploration-cum-taxonomic-research programmes.
    • The ZSI has published an extremely large amount of information on all animal taxa, from Protozoa to Mammalia.

    Try answering this PYQ:

    Q.With reference to India’s Biodiversity, Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are: (CSP 2020)

    (a) Birds

    (b) Primates

    (c) Reptiles

    (d) Amphibians

     

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  • Understanding the importance of vultures in our ecosystem

    Context

    India lost more than 95% of its vulture population through the 1990s and by the mid-2000s. Today, the country requires urgent conservation efforts to save vultures from becoming extinct.

    About vultures

    • Vultures belong to the Accipitridae family whose members include eagles, hawks and kites.
    • They are relatively social birds with an average lifespan of 10-30 years in the wild.
    • Vultures are slow breeders and so the survival of every individual is very crucial.
    • Generally, vultures rely on other carnivores to open carcasses.
    • Their powerful bills and long slender necks are designed to help them tear off the meat chunks from inside the carcass.
    • India has nine species of vultures. Many are critically endangered.
    • Vultures have a highly acidic stomach that helps them digest rotting carcass and kill disease-causing bacteria.

    Role played by vultures in ecosystem

    • Removing vultures from the ecosystem leads to inefficient clearing of carcasses and contaminates water systems.
    • If dead animals are left to rot for long durations, it may give rise to disease-causing pathogens.
    • The animals that consume such flesh become further carriers of disease.
    • Thus, they play a crucial role in maintaining the health of the ecosystem.

    Factors responsible for decline in future population

    • India has nine species of vultures. Many are critically endangered.
    • Use of diclofenac: The main reason for the decline in the vulture population is the use of the drug, diclofenac.
    • Diclofenac, which relieves cattle of pain, is toxic to vultures even in small doses and causes kidney failure and death.
    • Hunting: Myths about the medicinal healing powers of vultures’ body parts has led to the hunting of vultures.
    • Quarrying: Quarrying and blasting of stones where vultures nest have also caused their decline.

    Steps to increase numbers

    • India banned diclofenac for veterinary use in 2006.
    • Five States are to get vulture breeding centres under the Action Plan for Vulture Conservation for 2020-2025, approved in October 2020.
    • Vulture ‘restaurants’, which exist in some countries, are also a way of preserving the population.
    •  In these ‘restaurants’, diclofenac-free carcasses of cattle are dumped in designated areas where vultures gather to feed.

    Conclusion

    Awareness and action must go hand in hand. With International Vulture Awareness Day coming up on September 4, it is important for us to spread awareness about the importance of vultures in our ecosystem.

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  • Places in news: Sambhar Lake

    The world-famous Sambhar Salt Lake in Rajasthan is constantly shrinking with the degradation of soil and water quality and a decline in the population of migratory birds.

    Sambhar Lake

    • The lake, situated 80 km south-west of Jaipur, is the country’s largest inland saline water body which attracts thousands of migratory birds every year.
    • The death of more than 20,000 birds belonging to about 10 species which migrate annually to the lake had made international headlines in 2019.
    • The lake receives water from six rivers: Mantha, Rupangarh, Khari, Khandela, Medtha and Samod.
    • Sambhar has been designated as a Ramsar site because the wetland is a key wintering area for tens of thousands of pink flamingos and other birds that migrate from northern Asia and Siberia.

    Threats: Illegal mining

    • 30% of the Sambhar Lake’s area had been lost to mining and other activities, including the illegal salt pan encroachments.
    • It has also threatened the livelihoods of local people who have always lived in harmony with the lake and its ecology.

    Try answering this:

    Which one of the following is an artificial lake? (CSP 2014)

    (a) Kodaikanal (Tamil Nadu)

    (b) Kolleru (Andhra Pradesh)

    (c) Nainital (Uttarakhand)

    (d) Renuka (Himachal Pradesh)

    [wpdiscuz-feedback id=”vm4ti120of” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

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  • Hawaii’s Kilauea Volcano

    Geologists have detected a swarm of earthquakes at Hawaii’s Kilauea volcano, though it was not erupting.

    Kilauea Volcano

    • Kilauea is about 200 miles south of Honolulu, on the Big Island of Hawaii.
    • It is one of the world’s most active volcanoes, having erupted 34 times since 1952. In Hawaiian tradition, Kilauea is home to the volcano goddess Pele.
    • From 1983 to 2018, it erupted almost continuously, in some cases sending streams of lava that covered farms and homes.
    • At the end of this decades-long eruption, Kilauea spewed lava from vents in a residential neighborhood on its eastern flank and destroyed more than 700 homes.
    • In December, Kilauea erupted at the crater, creating a lake with enough lava to fill 10 Hoover dams. That eruption ended in May.

    Do not skip answering this PYQ:

    Consider the following statements:

    1. The Barren Island volcano is an active volcano located in the Indian Territory.
    2. Barren Island lies about 140 km east of Great Nicobar.
    3. The last time the Barren Island volcano erupted was in 1991 and it has remained inactive since then.

    Which of the statements given above is/are correct? (CSP 2014)

    (a) 1 only

    (b) 2 and 3 only

    (c) 3 only

    (d) 1 and 3 only

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    Back2Basics: Volcanic Landforms

    • Note the intrinsic and extrinsic types of volcanic landforms

    • A volcano has 3 main characteristics
    1. Cone shaped mountain
    2. Formed by rock or ash thrown from the inside of the earth
    3. At times, opening or depression at top
    • The three main types of volcanos are:

    1. Cinder cone Volcano: The cinder cones are small volcanoes with steep sides. Even though they are small, these are the ones you probably hear about.  They are very explosive and made of ash and rock.  Most of the cinder cones are small and less than 500 meters high.  A famous cinder cone is Sunset Crater Volcano in Arizona.
    2. Shield Volcanoes: A shield is a low and broad volcano that usually has a very wide crater (a dent in the Earth’s surface). It is formed from thin layers of lava after consistent low-grade eruptions.  The largest volcano in the world is a shield volcano.  It is located in Hawaii.
    3. Composite volcanoes: They are the tallest type of volcano. They look very impressive but do usually have quiet and slow lava flows.  They sometimes have small eruptions that cause ash and rock to go flying.  One of the most famous volcanoes in the world is a composite volcano.  It is Mount Fuji in Japan.

  • SUJALAM Campaign

    The Ministry of Jal Shakti began ‘SUJALAM’, a ‘100 days campaign’ to create more and more ODF Plus villages by undertaking wastewater management at the village level.

    SUJALAM Campaign

    The key activities that will be organized in the villages under this campaign include:

    • Organizing Community consultations, Khuli Baithaks and Gram Sabha meetings to analyze the current situation
    • Pass resolution to maintain ODF sustainability and achieve a needed number of soak pits to manage the greywater
    • Develop a 100 days’ plan to undertake sustainability and soak pit construction-related activities
    • Construct a requisite number of soak pits
    • Retrofit toilets where needed through IEC and community mobilization and
    • Ensure all newly emerging Households in the village have access to toilets

    Objectives of the campaign

    • The effort of the campaign would be directed towards achieving the ODF plus status for villages across the country in an accelerated manner in a short time.
    • The campaign will not only build desired infrastructure soak pit for management of greywater in villages but will also aid in sustainable management of water bodies.
    • The disposal of wastewater and clogging of water bodies in the villages or on the outskirts of the villages remain one of the major problems.
    • The Campaign would help in the management of the wastewater and in turn, would help to revive the water bodies.

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  • [pib] Transport Initiative for Asia (TIA) Project

    NITI Aayog and World Resources Institute (WRI), India, jointly launched the ‘Forum for Decarbonizing Transport’ in India as part of the NDC-Transport Initiative for Asia (NDC-TIA).

    Transport Initiative for Asia

    • The NDC Transport Initiative for Asia (TIA 2020-2023) is a joint programme that will engage China, India, and Vietnam in promoting a comprehensive approach to decarbonizing transport in their respective countries.
    • The project is part of the International Climate Initiative (IKI).
    • NITI Aayog is the implementing partner for the India component of the project.
    • The project aims at bringing down the peak level of GHG emissions (transport sector) in Asia (in line with a well below 2-degree pathway), resulting in problems like congestion and air pollution.

    Why need such initiative?

    • India has a massive and diverse transport sector, which is also the third most CO2 emitting sector.
    • Data suggests that within the transport sector, road transport contributes to more than 90% of the total CO2 emissions.
    • The NDC-TIA India component focuses on developing a coherent strategy of effective policies and the formation of a multi-stakeholder platform for decarbonizing transport in the country.

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  • Places in news: Corbett Tiger Reserve

    The Delhi High Court has asked the National Tiger Conservation Authority (NTCA) to consider as a representation a petition to stop the alleged illegal construction of bridges and walls within the tiger breeding habitat of the Corbett Tiger Reserve.

    Jim Corbett National Park

    • Jim Corbett NP is the oldest national park in India and was established in 1936 as Hailey National Park to protect the endangered Bengal tiger.
    • It is located in Nainital district and Pauri Garhwal district of Uttarakhand and was named after hunter and naturalist Jim Corbett.
    • The park was the first to come under the Project Tiger initiative.
    • It has sub-Himalayan belt geographical and ecological characteristics.
    • Dense moist deciduous forest mainly consists of sal, haldu, peepal, rohini and mango trees.
    • Forest covers almost 73% of the park, while 10% of the area consists of grasslands.

    Try answering this PYQ:

    Among the following Tiger Reserves, which one has the largest area under “Critical Tiger Habitat” ? (CSP 2020)

    (a) Corbett

    (b) Ranthambore

    (c) Nagarjunasagar- Srisailam

    (d) Sunderbans

     

    [wpdiscuz-feedback id=”j0d533r4jj” question=”Please leave a feedback on this” opened=”1″]Post your answers here:[/wpdiscuz-feedback]

    Back2Basics: National Tiger Conservation Authority

    • The NTCA was established in December 2005, following a recommendation of the Tiger Task Force, constituted by the Prime Minister of India.
    • The Wildlife Protection Act of 1972 was amended in 2006 to provide for constituting NTCA responsible for the implementation of the Project Tiger plan to protect endangered tigers.
    • It works for the reorganized management of Project Tiger and the many Tiger Reserves in India.
    • A program for protection called, ‘Tiger Protection Program’ (popularly known as Project Tiger) was started in 1973, by the GOI in co-operation with WWF.

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