💥Join UPSC 2027,2028 Mentorship (July Batch) + XFactor Notes & Microthemes PDF
Talk to Mentor

Civilsdaily

Login

Subject: Environment

  • Northern European Enclosure Dam (NEED)

     

    An extraordinary measure to protect 25 million people and important economic regions of 15 Northern European countries from rising seas has been proposed. It is called Northern European Enclosure Dam (NEED) enclosing all of the North Sea.

    Northern European Enclosure Dam (NEED)

    • The scientists have proposed the construction of two dams of a combined length of 637 km — the first between northern Scotland and western Norway.
    • It would be 476 km and with an average depth of 121 m and maximum depth of 321 m; the second between France and southwestern England, of length 161 km, and average depth of 85 m and maximum depth of 102 m.
    • A/c to scientists, separating the North and Baltic Seas from the Atlantic Ocean is considered to be the “most viable option” to protect Northern Europe against unstoppable sea level rise (SLR).
    • They have also identified other regions in the world where such mega-enclosures could potentially be considered, including the Persian Gulf, the Mediterranean Sea, the Baltic Sea, the Irish Sea, and the Red Sea.

    The rationale behind

    • The concept of constructing NEED showcases the extent of protection efforts that are required if mitigation efforts fail to limit sea level rise.
    • While NEED may appear to be “overwhelming” and “unrealistic”, it could be “potentially favourable” financially and in scale when compared with alternative solutions to fight SLR, the research argues.
    • The researchers classify the solutions to SLR into three categories of taking no action, protection, and managed retreat — and submit that NEED is in the second category.
    • While managed retreat, which includes options such as managed migrations, may be less expensive than protection (NEED), it involves intangible costs such as national and international political instability, psychological difficulties, and loss of culture and heritage for migrants.
    • NEED, the paper says, will have the least direct impact on people’s daily lives, can be built at a “reasonable cost”, and has the largest potential to be implemented with the required urgency to be effective.

    Viability of NEED

    • The researchers have estimated the total costs associated with NEED at between €250 billion and €550 billion.
    • They referred to the costs of building the 33.9-km Saemangeum Seawall in South Korea and the Maasvlakte 2 extension of the Rotterdam harbour in the Netherlands as examples,
    • If construction is spread over a 20-year period, this will work out to an annual expense of around 0.07%-0.16% of the GDP of the 15 Northern European countries that will be involved.
    • Also the construction will “heavily impact” marine and terrestrial ecosystems inside and outside the enclosure, will have social and cultural implications, and affect tourism and fisheries.

  • Specie in news: ‘World’s largest’ subterranean fish

     

    Systematic exploration of the Meghalayan caves has been underway for almost 30 years and hundreds of kilometres of cave passages have been explored and mapped. In a cave in a remote forested area of Meghalaya’s Jaintia Hills a research expedition found large specie of a subterranean fish (occurring under the earth’s surface).

    About the fish

    • The blind fish was over 40 cm. It has not been named so far.
    • It is nearly five times the mean length (85mm/8.5 cm) for all known subterranean fish to date.
    • The only other species exceeding 300mm (30 cm) in length are eel-like Synbranchidae with nothing like the bulk of the new fish.
    • The 250-known subterranean (occurring under the earth’s surface) fish species around the world measure only around 8.5 cm on average.
    • The specialists say that possibly one (or more) populations of these fish became isolated deeper in the caves and over generations became adapted to the dark, losing their eyes in the process.

    Closest resemblance

    • The experts feel that the fish species is very similar to the Golden Mahseer or the Tor Putitora, one of the most famous game fish of the Himalayan rivers.
    • Unique characters that distinguishes it from the Golden Mahseer is the lack of pigmentation, a lack of eyes and of course, its subterranean habitat – being locked in caves.
    • There are ‘normal’ Golden Mahseer in the area too but there is not much surface water (at least in the dry winter months) so fish end up in the cave pools and underground rivers.

    Features of Subterranean ecosystems

    • Subterranean ecosystems are considered extreme, high-stress environments characterised by darkness, truncated food webs and food scarcity.
    • Despite this, they harbour exceptional vertebrate and invertebrate taxa (21,000+ species), many of which are evolutionarily unique, and relics of ancient fauna given their long-term isolation.
    • Many cave fish show different adaptations – some don’t have eyes, some have reduced eyes, some don’t have fins, some have weird body shapes.

  • State of India’s Birds 2020 (SoIB) Assessment

     

    State of India’s Birds 2020 (SoIB) assessment was recently released.

    Highlights of the report

     

     

    • The SoIB was produced using a base of 867 species (among 1,333 birds ever recorded in India), and analysed with the help of data uploaded by birdwatchers to the online platform, eBird.
    • Adequate data on how birds fared over a period of over 25 years (long-term trend) are available only for 261 species.
    • Current annual trends are calculated over a five-year period.

    Alarming declines

    • The SoIB assessment raises the alarm that several spectacular birds, many of them endemic to the sub-continent, face a growing threat from loss of habitat due to human activity, widespread presence of toxins including pesticides, hunting and trapping for the pet trade.
    • Diminishing population sizes of many birds because of one factor brings them closer to extinction because of the accelerated effects of others, the report warned.
    • Over a fifth of India’s bird diversity, ranging from the Short-toed Snake Eagle to the Sirkeer Malkoha, has suffered strong long-term declines over a 25-year period.
    • More recent annual trends point to a drastic 80% loss among several common birds.

    Various species mentioned

    • Of 101 species categorised as being of High Conservation Concern — 59 based on range and abundance and the rest included from high-risk birds on the IUCN Red List.
    • Endemics such as the Rufous-fronted Prinia, Nilgiri Thrush, Nilgiri Pipit and Indian vulture were confirmed as suffering current decline.
    • And all except 13 had a restricted or highly restricted range, indicating greater vulnerability to man-made threats.
    • Peafowl, on the other hand, are rising in numbers, expanding their range into places such as Kerala, which is drying overall, and areas in the Thar desert where canals and irrigation have been introduced. Stricter protection for peacocks under law also could be at work.

  • Urban Heat Islands in India

     

    A recent study from IIT Kharagpur called “Anthropogenic forcing exacerbating the urban heat islands in India” noted that the relatively warmer temperature in urban areas, compared to suburbs, may contain potential health hazards due to heat waves apart from pollution.

    About the study

    • The research did study the difference between urban and surrounding rural land surface temperatures, across all seasons in 44 major cities from 2001 to 2017.
    • It found evidence of mean daytime temperature of surface urban heat island (UHI Intensity) going up to 2 degrees C for most cities, as analysed from satellite temperature measurements in monsoon and post monsoon periods.
    • Other researchers from elsewhere have also noticed similar rise in daytime temperatures in Delhi, Mumbai, Bengaluru, Hyderabad and Chennai.

    What is an Urban Heat Island?

    • An urban heat island (abbreviated as UHI) is where the temperature in a densely populated city is as much as 2 degrees higher than suburban or rural areas.
    • This happens because of the materials used for pavements, roads and roofs, such as concrete, asphalt (tar) and bricks, which are opaque, do not transmit light, but have higher heat capacity and thermal conductivity than rural areas, which have more open space, trees and grass.
    • Trees and plants are characterised by their ‘evapotranspiration’— a combination of words wherein evaporation involves the movement of water to the surrounding air, and transpiration refers to the movement of water within a plant and a subsequent lot of water through the stomata (pores found on the leaf surface) in its leaves.
    • Grass, plants and trees in the suburbs and rural areas do this. The lack of such evapotranspiration in the city leads to the city experiencing higher temperature than its surroundings.

    Latent impacts

    • UHI s also decrease air quality in the cities, thanks to pollution generated by industrial and automobile exhaust, higher extent of particulate matter and greater amounts of dust than in rural areas.
    • Due to this higher temperature in urban areas, the UHI increases the colonization of species that like warm temperatures, such as lizards and geckos.
    • Insects such as ants are more abundant here than in rural areas; these are referred to as ectotherms.
    • In addition, cities tend to experience heat waves which affect human and animal health, leading to heat cramps, sleep deprivation and increased mortality rates.
    • UHIs also impact nearby water bodies, as warmer water (thanks to the pavements, rooftops and so on) is transferred from the city to drains in sewers, and released into nearby lakes and creeks, thus impairing their water quality.

    Control of UHIs and mitigation

    • Industrialization and economic development are vital to the country, but the control of UHIs and their fallouts are equally vital. Towards this, several methods are being, and can be, tried.
    • One of them is to use greener rooftops, using light-coloured concrete (using limestone aggregates along with asphalt (or tar) making the road surface greyish or even pinkish (as some places in the US have done); these are 50% better than black, since they absorb less heat and reflect more sunlight.
    • Likewise, we should paint rooftops green, and install solar panels there amidst a green background.
    • The other is to plant as many trees and plants as possible

    Why plant more trees?

    Relevant to the present context are:

    • they combat climate change; clean the surrounding air by absorbing pollutant gases (NXOy, O3, NH3, SO2, and others) and trapping particulates on their leaves and bark;
    • they cool the city and the streets; conserve energy (cutting air-conditioning costs by 50%); save water and help prevent water pollution; help prevent soil erosion; protect people and children from UV light;
    • they offer economic opportunities; bring diverse group of people together; encourage civic pride by giving neighborhoods a new identity; mask concrete walls, thus muffling sounds from streets and highways, and eye-soothing canopy of green; and the more a business district has trees, more business follows.

  • Species in news: Indian Pangolin

     

    The Madhya Pradesh forest department has radio-tagged an Indian Pangolin (Manis crassicaudata) for the first time.

    Pangolins

    IUCN status: Endangered

    • India is home to two species of pangolin.
    • While the Chinese Pangolin (Manis pentadactyla) is found in northeastern India, the Indian Pangolin is distributed in other parts of the country as well as Sri Lanka, Bangladesh and Pakistan.
    • Both these species are protected and are listed under the Schedule I Part I of the Wild Life (Protection) Act, 1972 and under Appendix I of the Convention on International Trade in Endangered Species (CITES).
    • Commonly known as ‘scaly anteaters’, the toothless animals are unique, a result of millions of years of evolution.
    • Pangolins evolved scales as a means of protection. When threatened by big carnivores like lions or tigers they usually curl into a ball.
    • The scales defend them against dental attacks from the predators.

    Why this radio-tagging?

    • The radio-tagging aims to know its ecology and develop an effective conservation plan for it.
    • The radio-tagging is part of a joint project by the department and non-profit, the Wildlife Conservation Trust (WCT) that also involves the species’ monitoring apart from other activities.

    Why protect Pangolins?

    • Pangolins are currently the most trafficked wildlife species in the world.
    • These Scales has now become the main cause of the pangolin’s disappearance.
    • The scales are in high demand in China, where they are used in traditional Chinese medicine.
    • Pangolin meat is also in high demand in China and Southeast Asia.
    • Consequently, pangolins have seen a rapid reduction in population globally. The projected population declines range from 50 per cent to 80 per cent across the genus.

  • ‘Future of Earth, 2020’ Report

     

    The “The Future of Earth, 2020” Report was recently released.

    About the report

    • The report is released by the South Asia Future Earth Regional Office, Divecha Centre for Climate Change, Indian Institute of Science.
    • The report was prepared with the aim of reducing carbon footprint and halting global warming below 2 degree Celsius by 2050.

    Highlights of the report

    • Five global risks that have the potential to impact and amplify one another in ways that may cascade to create global systemic crisis have been listed by report.
    • It listed the following as five global risks:
    1. failure of climate change mitigation and adaptation
    2. extreme weather events
    3. major biodiversity loss and ecosystem collapse
    4. food crises; and
    5. water crises
    • Offering examples of how the interrelation of risk factors play a role, scientists say extreme heatwaves can accelerate global warming by releasing large amounts of stored carbon from affected ecosystems, and at the same time intensify water crises and/ or food scarcity.
    • The loss of biodiversity also weakens the capacity of natural and agricultural systems to cope with climate extremes, increasing our vulnerability to food crises, they point out.

  • Global cost of air pollution from fossil fuels

     

     

     

     

     

     

     

     

    A new Greenpeace report has estimated the global cost of air pollution from fossil fuels at around $2.9 trillion per year, or $8 billion per day — 3.3% of the world’s GDP.

    Cost of air pollution

    India is estimated to bear a cost of $150 billion, or 5.4% of the country’s GDP, which is the third-highest absolute cost from fossil fuel air pollution worldwide.

    China and the US are estimated to bear the highest absolute costs from fossil fuel air pollution, respectively at $900 billion and $600 billion.

    Loss of lives

    • Globally, air pollution is estimated to cause 4.5 million premature deaths each year.
    • This includes 3 million deaths attributable globally to PM2.5, which is one of the principal pollutants in northern Indian cities including Delhi.
    • Globally, PM2.5 is also estimated to cause the loss of 62.7 million years of life, 2.7 million emergency room visits due to asthma, 2 million preterm births and 1.75 billion work absences.
    • The 2 million preterm births include 981,000 in India and over 350,000 in China.

    Economic cost

    In India, exposure to fossil fuels also leads to a loss of around 490 million workdays, the report said.

  • Species in news: Thanatotheristes

     

    Scientists have found that a dinosaur fossil, found in Alberta in Canada in 2010, belongs to a new species of tyrannosaur. They have named it Thanatotheristes, which means “reaper of death”.

    Thanatotheristes

    • Tyrannosaurs were one of the largest meat-eating dinosaurs to have ever lived, with very large and high skulls, and the best known among them is the Tyrannosaurus rex, celebrated in the Jurassic Park series.
    • The 79-million-year-old fossil that the researchers have found is the oldest tyrannosaur known from northern North America.
    • Thanatotheristes preyed on large plant-eating dinosaurs such as the horned xenoceratops and the dome-headed colepiochephale.
    • The research suggests that tyrannosaurs did not have one general body type; rather different tyrannosaur species evolved distinct body sizes, skull forms and other such physical features.
    • The fossil specimen is important to understand the Late Cretaceous period, which is the period when tyrannosaurs roamed the Earth.

  • [pib] 13th COP of the Convention on the Conservation of Migratory Species of Wild Animals (CMS)

     

    The 13th Conference of Parties (COP) of the Convention on the Conservation of Migratory Species of Wild Animals (CMS) is going to be hosted by India at Gandhinagar in Gujarat.

    13th COP of CMS

    • The theme of CMS COP13 in India is, “Migratory species connect the planet and we welcome them home.
    • The CMS COP 13 logo is inspired by ‘Kolam’, a traditional artform from southern India.
    • In the logo of CMS COP-13, Kolam art form is used to depict key migratory species in India like Amur falcon, humpback whale and marine turtles.
    • The mascot for CMS COP13, “Gibi – The Great Indian Bustard” is a critically endangered species which has been accorded the highest protection status under the Wildlife Protection Act, 1972.

    About CMS

    • CMS is an international treaty concluded under aegis of UN Environment Programme (UNEP), concerned with conservation of wildlife and habitats on a global scale.
    • It is commonly abbreviated as Convention on Migratory Species (CMS) or the Bonn Convention.
    • It aims to conserve terrestrial, marine and avian migratory species throughout their range.
    • It was signed in 1979 in Bonn (hence the name), Germany and entered into force in 1983.
    • Its headquarters are in Bonn, Germany.
    • CMS is only global and UN-based intergovernmental organization established exclusively for conservation and management of terrestrial, aquatic and avian migratory species throughout their range.

    Prospects for India

    • As the host, India shall be designated the President for the next three years.
    • India is Signatory to the CMS since 1983.
    • India has been taking necessary actions to protect and conserve migratory marine species.
    • Seven species that include Dugong, Whale Shark, Marine Turtle (two species), have been identified for preparation of Conservation and Recovery Action Plan.

    Other facts

    • The Indian sub-continent is also part of the major bird flyway network, i.e, the Central Asian Flyway (CAF) that covers areas between the Arctic and Indian Oceans, and covers at least 279 populations of 182 migratory water bird species, including 29 globally threatened species.
    • India is home to several migratory species of wildlife including snow leopard, Amur falcons, bar headed Geese, black necked cranes, marine turtles, dugongs, humpbacked whales, etc.
    • It has signed non legally binding MOU with CMS on the conservation and management of Siberian Cranes (1998), Marine Turtles (2007), Dugongs (2008) and Raptors (2016).

  • Thwaites Glacier

     

    In the Antarctic floats a massive glacier, roughly the size of Britain, whose melting has been a cause of alarm for scientists over the years. Now, a new study has pinned the cause of the melting to the presence of warm water at a vital point beneath the glacier.

    Thwaites Glacier

    • The Thwaites Glacier is 120 km wide at its broadest, fast-moving and melting fast over the years.
    • Because of its size (1.9 lakh square km), it contains enough water to raise the world sea level by more than half a metre.
    • Studies have found the amount of ice flowing out of it has nearly doubled over the past 30 years. Today, Thwaites’s melting already contributes 4% to global sea level rise each year.
    • It is estimated that it would collapse into the sea in 200-900 years. Thwaites is important for Antarctica as it slows the ice behind it from freely flowing into the ocean.
    • Because of the risk it faces — and poses — Thwaites is often called the Doomsday Glacier.

    What has the new study found?

    • A 2019 study had discovered a fast-growing cavity in the glacier.
    • More recently researchers detected warm water at a vital point below the glacier.
    • Scientists dug a 600-m-deep and 35-cm-wide access hole, and deployed an ocean-sensing device called Icefin to measure the waters moving below the glacier’s surface.
    • The study reported water at just two degrees above freezing point at Thwaites’s “grounding zone” or “grounding line”.

    What is the grounding line?

    • The grounding line is the place below a glacier at which the ice transitions between resting fully on bedrock and floating on the ocean as an ice shelf.
    • The location of the line is a pointer to the rate of retreat of a glacier.
    • When glaciers melt and lose weight, they float off the land where they used to be situated. When this happens, the grounding line retreats.
    • That exposes more of a glacier’s underside to seawater, increasing the likelihood it will melt faster.
    • This resulted in the glacier speeding up, stretching out, and thinning, causing the grounding line to retreat ever further.