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Subject: Environment

  • [pib] Methanotrophs: the methane-oxidizing bacteria

     

    Scientists at Agharkar Research Institute (ARI), Pune have isolated 45 different strains of methanotrophic bacteria which have been found to be capable of reducing methane emissions from rice plants.

    What are Methanotrophs?

    • They are bacteria that metabolize and convert methane into carbon-di-oxide.
    • They can effectively reduce the emission of methane, which is the second most important greenhouse gas (GHG) and 26 times more potent as compared to carbon-di-oxide.
    • In rice fields, Methanotrophs are active near the roots or soil-water interfaces.
    • Besides methane mitigation studies, Methanotrophs can also be used in methane value addition (valorization) studies.
    • Bio-methane generated from waste can be used by the Methanotrophs and can be converted to value-added products such as single-cell proteins, carotenoids, biodiesel, and so on.

    Why rice fields?

    • Rice fields are human-made wetlands and are waterlogged for a considerable period. Anaerobic degradation of organic matter results in the generation of methane.
    • Rice fields contribute to nearly 10% of global methane emissions.
    • Very few studies in the world have focused on Methanotrophs from tropical wetlands or tropical rice fields.
    • Practically no cultures of indigenously isolated Methanotrophs from India were available.
    • Native and relevant Methanotrophs isolated from rice fields can be excellent models to understand the effect of various factors on methane mitigation.

    Must read:

    https://www.civilsdaily.com/news/greenhouse-gas-emissions-from-indian-paddy-fields-very-high-ny-based-study/

     

  • Sahyadri Megha

    The University of Agricultural and Horticultural Sciences (UAHS), Shivamogga (K’taka) has developed ‘Sahyadri Megha’, a new red variety of paddy that is resistant to blast (a fungal disease) and rich in nutrients.

    Sahyadri Megha

    • It is a red variety of paddy that is resistant to blast disease and rich in nutrients.
    • It was developed under the hybridization breeding method by cross-breeding the best among the ‘Jyothi’ variety with that of ‘Akkalu’, a disease-resistant and protein-rich paddy variety.
    • The new variety will be notified under the Indian Seed Act 1966 shortly after which it will become part of the seed chain.

    Key features

    • The protein content in it is 12.48%, higher than the other red rice varieties grown.
    • The yield per hectare from ‘Sahyadri Megha’ is around 65 quintals, substantially higher than other red paddy varieties.
    • It is a medium-term paddy that can be grown when there is a delay in the onset of monsoon. It can be harvested after 120 days of sowing.

  • Explained: Cycle 25/ Solar Cycle

     

     

    The sunspots identified by researchers from IISER Kolkata herald the start of a new solar cycle called Cycle 25.

    What are Sunspots?

    • Sunspots are temporary phenomena on the Sun’s photosphere that appear as spots darker than the surrounding areas. They are relatively cooler spots on the Sun’s surface.
    • They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection.
    • Sunspots usually appear in pairs of opposite magnetic polarity with a leader and a follower.

    What is Solar Cycle?

    • From our safe distance of about 148 million km, the Sun appears to be sedate and constant. However, huge solar flares and coronal mass ejections spew material from its surface into outer space.
    • They originate from sunspots, an important phenomenon that people have been following for hundreds of years. They originate deep within the Sun and become visible when they pop out.
    • Their number is not constant but shows a minimum and then rises up to a maximum and then falls again in what is called the solar cycle.
    • Every 11 years or so, the Sun’s magnetic field completely flips. This means that the Sun’s north and south poles switch places. Then it takes about another 11 years for the Sun’s north and south poles to flip back again.
    • So far, astronomers have documented 24 such cycles, the last one ended in 2019.

    How do they occur?

    • Given the high temperatures in the Sun, matter exists there in the form of plasma, where the electrons are stripped away from the nuclei.
    • The Sun is made of hot ionized plasma whose motions generate magnetic fields in the solar interior by harnessing the energy of the plasma flows.
    • This mechanism is known as the solar dynamo mechanism (or magnetohydrodynamic dynamo mechanism).
    • Simply stated, it is a process by which kinetic energy of plasma motions is converted to magnetic energy, which generates the magnetised sunspots, giving rise to the solar cycle..
    • Because of the nature of the solar dynamo, the part of its magnetic field that gives rise to sunspots reverses direction when it moves from one solar cycle to another.
    • This can be inferred by observing when the relative orientation of the sunspot pairs flips.

    Features

    • The solar cycle affects activity on the surface of the Sun, such as sunspots which are caused by the Sun’s magnetic fields. As the magnetic fields change, so does the amount of activity on the Sun’s surface.
    • One way to track the solar cycle is by counting the number of sunspots.
    • The beginning of a solar cycle is a solar minimum, or when the Sun has the least sunspots. Over time, solar activity—and the number of sunspots—increases.
    • The middle of the solar cycle is the solar maximum, or when the Sun has the most sunspots. As the cycle ends, it fades back to the solar minimum and then a new cycle begins.
    • Giant eruptions on the Sun, such as solar flares and coronal mass ejections, also increase during the solar cycle. These eruptions send powerful bursts of energy and material into space.

    Impacts of Solar Cycle

    • This activity has effects on Earth. For example, eruptions can cause lights in the sky, called aurora, or impact radio communications. Extreme eruptions can even affect electricity grids on Earth.
    • Solar activity can affect satellite electronics and limit their lifetime.
    • Radiation can be dangerous for astronauts who do work on the outside of the International Space Station.
    • Forecasting of the solar cycle can help scientists protect our radio communications on Earth, and help keep satellites and astronauts safe.

    Start of cycle 25

    • Following a weakening trend in activity over the last few cycles, there were predictions that the Sun would go silent into a grand minimum in activity, with the disappearance of cycles.
    • However, a team from IISER Kolkata has shown that there are signs that cycle 25 has just begun.
    • They used the data from the instrument Helioseismic and Magnetic Imager aboard NASA’s space-based Solar Dynamics Observatory for their calculations.

    Why is this so important to us on earth?

    • After all the sunspots look small and are hardly even visible to us. Contrary to this, sunspot activity may be correlated with climate on earth.
    • In the period between 1645 and 1715, sun spot activity had come to a halt on the Sun – a phenomenon referred to as the Maunder minimum.
    • This coincided with extremely cold weather globally. So sunspots may have a relevance to climate on earth.
    • Such links are tenuous, but definitely solar activity affects space weather, which can have an impact on space-based satellites, GPS, power grids and so on.

  • Species in news: Red Panda

     

     

    According to a report by the TRAFFIC report, there has been a considerable reduction in the poaching of Red Panda (ailurus fulgens). The report also recommended trans-boundary law enforcement co-operation through the use of multi-government platforms like SAWEN (South Asia Wildlife Enforcement Network).

    Red Panda

    IUCN Red List Status: Endangered

    • The red panda (Ailurus fulgens) is a mammal native to the eastern Himalayas and southwestern China.
    • Its wild population is estimated at fewer than 10,000 mature individuals and continues to decline due to habitat loss and fragmentation, poaching, and inbreeding depression.
    • Despite its name, it is not closely related to the giant panda
    • The animal has been hunted for meat and fur, besides illegal capture for the pet trade.
    • An estimated 14,500 animals are left in the wild across Nepal, Bhutan, India, China and Myanmar.
    • About 5,000-6,000 red pandas are estimated to be present in four Indian states – Arunachal Pradesh, Meghalaya, Sikkim and West Bengal.
    • The diminishing habitat is a major threat to the species which is a very selective feeder and survives on selected species of bamboos.

    About South Asia Wildlife Enforcement Network (SAWEN)

    • SAWEN is a Regional network is comprised of eight countries in South Asia: Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri Lanka.
    • It aims at working as a strong regional intergovernmental body for combating wildlife crime by attempting common goals and approaches for combating illegal trade in the region.
    • The South Asia region is very vulnerable to illegal traffic and wildlife crimes due to the presence of precious biodiversity and large markets as well as traffic routes for wildlife products in the south East Asian region.
    • The collaboration in harmonizing as well as enforcing the wildlife protection in the region is considered very important for effective conservation of such precious biodiversity.
    • India adopted the Statute of the SAWEN and became its formal member in 2016.

    Back2Basics

    TRAFFIC

    • The TRAFFIC, the Wildlife Trade Monitoring Network, is a leading non-governmental organisation working on wildlife trade in the context of both biodiversity conservation and sustainable development.
    • It is a joint program of World Wildlife Fund (WWF) and the IUCN.
    • It aims to ensure that trade in wild plants and animals is not a threat to the conservation of nature.
    • The TRAFFIC is governed by the TRAFFIC Committee, a steering group composed of members of TRAFFIC’s partner organizations, WWF and IUCN.
    • TRAFFIC also works in close co-operation with the Secretariat of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).

  • [pib] Person in news: Gaura Devi

     

     

    Union HRD Minister along with senior women officers of the Ministry planted a sapling in memory of Gaura Devi, Chipko Activist in New Delhi.

    Gaura Devi

    • Gaura Devi was born in 1925 in a village named Lata in the state of Uttarakhand. She moved to a nearby village named Reni by the Alaknanda River.
    • She was elected to lead the Mahila Mangal Dal (Women’s Welfare Association) in the wake of the Chipko movement. The organization worked on the protection of community forests.

    Her contributions in Chipko Movement

    • Gaura Devi came to notice in 1974 when she was told that local loggers were cutting the trees.
    • The men of Reni village had been tricked out of the village by news that the government was going to pay out compensation for land used by the army.
    • She challenged the men to shoot her instead of cutting down the trees and she described the forest with her maika (mother’s house).
    • They managed to halt their work by hugging the trees despite the abuse of the armed loggers.
    • They kept guard of the trees that night and over the next three or four days other villages and villagers joined the action. The loggers left leaving the trees.

    Impact

    • After this incident, the Uttar Pradesh Government established a committee of experts to investigate the issue of felling of trees, and the lumber company withdrew its men from Reni.
    • The committee stated that the Reni forest was an ecologically sensitive area and that no trees should be felled there.
    • Thereafter the government of Uttar Pradesh placed a 10-year ban on all tree-felling in an area of over 1150 km².

  • [pib] Law for Rain Water Harvesting

     

     

    The Ministry of Housing & Urban Affairs has issued the Model Building Bye Laws, 2016 for guidance of the States/UTs and has a chapter on ‘Rainwater Harvesting’.

    Why such move?

    • These laws aim to regulate the over-exploitation and consequent depletion of ground water.
    • It would enable States/UTs to enact suitable ground water legislation for regulation of its development, which includes provision of rain water harvesting.

    About the Bye Laws

    • 33 States/UTs have adopted the rainwater harvesting provisions.
    • The provisions of this chapter are applicable to all the buildings.

    Various provisions

    • As per Model Building Bye Laws- 2016, provision of rainwater harvesting is applicable to all residential plots above 100 sq.m.
    • Water being a State subject, initiatives on water management including conservation and water harvesting in the Country is primarily States’ responsibility.
    • So the implementation of the rainwater harvesting policy comes within the purview of the State Government/Urban Local Body / Urban Development Authority.

    Back2Basics

    Groundwater governance in India

    • Central Ground Water Authority (CGWA) has been constituted under Section 3(3) of the ‘Environment (Protection) Act, 1986’ for the purpose of regulation and control of groundwater development and management in the Country.
    • CGWA is regulating ground water withdrawal by industries/infrastructure/ mining projects in the country for which guidelines/ criteria have been framed which includes rainwater harvesting as one of the provisions while issuing No Objection Certificate.

  • National Interlinking of Rivers Authority (NIRA)

     

     

    The Central government is working on the establishment of an exclusive body to implement projects for linking rivers.

    National Interlinking of Rivers Authority

    • To be called the NIRA, the proposed body is expected to take up both inter-State and intra-State projects.
    • It will also make arrangements for generating up funds, internally and externally.
    • Headed by Union Minister of Jal Shakti, the panel includes Irrigation or Water Resources Ministers and Secretaries of States.
    • It is being assisted by a Task Force for ILR, which is a committee of experts essentially drawn from the Jal Shakti Ministry, Central Water Commission and the NWDA.

    About National River Linking Project (NRLP)

    • The NRLP formally known as the National Perspective Plan, envisages the transfer of water from water ‘surplus’ basins where there is flooding to water ‘deficit’ basins where there is drought/scarcity, through inter-basin water transfer projects.
    • It is designed to ease water shortages in western and southern India while mitigating the impacts of recurrent floods in the eastern parts of the Ganga basin.
    • Interlinking of rivers was conceived more than 125 years ago by Sir Arthur Cotton, mainly to facilitate trade but it was not implemented then.
    • The proposed NRLP, now comprises 29 canals totalling 9,600 km, will involve the movement of 245 trillion litres of water.
    • If and when implemented, it will be one of the biggest inter-basin water transfer projects in the world.

    ILR Projects in India

    • As of now, six ILR projects — the Ken-Betwa, Damanganga- Pinjal, Par-Tapi-Narmada, Manas-Sankosh-Teesta-Ganga, Mahanadi-Godavari and Godavari-Cauvery (Grand Anicut) — have been under examination of the authorities.
    • The Ken-Betwa ILR is India’s first such project.
    • With regard to the peninsular rivers, the Centre has chosen to focus on the Godavari-Cauvery link than the earlier proposal to link the Mahanadi-Godavari-Krishna-Pennar-Cauvery rivers.

    Issues and Concerns

    Ecological issues

    One of the major concerns is that rivers change their course in 70–100 years and thus once they are linked, future change of course could create huge practical problems for the project.

    Aqua life

    A number of leading environmentalists are of the opinion that the project could be an ecological disaster. There would be a decrease in downstream flows resulting in reduction of fresh water inflows into the seas seriously jeopardizing aquatic life.

    Deforestation

    Creation of canals would need large areas of land resulting in large scale deforestation in certain areas.

    Areas getting submerged

    Possibility of new dams comes with the threat of large otherwise habitable or reserved land getting submerged under water or surface water. Fertile deltas will be under threat, with coastal erosion expected to threaten the land and livelihoods of local economies that support 160 million people.

    Displacement of people

    As large strips of land might have to be converted to canals, a considerable population living in these areas must need to be rehabilitated to new areas.

    Dirtying of clean water

    As the rivers interlink, rivers with dirty water will get connected to rivers with clean water, hence dirtying the clean water.

    Disrupting of ecological flow

    On implementation, water discharge in 23 out of 29 rivers will reduce considerably, they say. The Ganga will see a 24% decrease in flow. Its tributaries Gandak (-68%) and Ghaghara (-55%) will be the worst affected. While the Brahmaputra will see only a 6% loss, its tributaries will see massive flow reductions: Manas (-73%), Sankosh (-72%) and Raidhak (-53%). Changes in water flow and trapping of silt in reservoirs will see a dip in the sediment deposited by rivers.

    Must read:

    https://www.indiawaterportal.org/articles/national-river-linking-project-dream-or-disaster

  • [pib] Biomethanation Process

     

     

    In an all India coordinated project, efforts are on to produce bio-gas for kitchen use and quality manure for fields using bio-methanation of rice straw by anaerobic digestion method. Six domestic level paddy straw-based bio-gas plants have been installed in Punjab for field trials and further study is in progress.

    What is Biomethanation?

    • It is a process by which organic material is microbiologically converted under anaerobic conditions to biogas.
    • Three main physiological groups of microorganisms are involved: fermenting bacteria, organic acid oxidizing bacteria, and methanogenic archaea.
    • Biomethanation has strong potential for the production of energy from organic residues and wastes. It will help to reduce the use of fossil fuels and thus reduce CO(2) emission.

    How it works?

    • Microorganisms degrade organic matter via cascades of biochemical conversions to methane and carbon dioxide.
    • Syntrophic relationships between hydrogen producers (acetogens) and hydrogen scavengers (homoacetogens, hydrogenotrophic methanogens, etc.) are critical to the process.
    • A wide variety of process applications for biomethanation of wastewaters, slurries, and solid waste have been developed.
    • They utilize different reactor types and process conditions (retention times, loading rates, temperatures, etc.) in order to maximize the energy output from the waste and also to decrease retention time and enhance process stability.

  • Species in news: Swamp Wallaby

     

    Researchers reported that the swamp wallaby, a marsupial related to the kangaroo, is pregnant throughout its adult life. It typically conceives a new embryo days before delivering the newborn from its previous pregnancy.

    Swamp wallaby

    IUCN Status: Least Concerned

    • The swamp wallaby is a small macropod marsupial of eastern Australia. It is likely the only mammal pregnant and lactating all lifelong.
    • Female wallabies and kangaroos have two uteri and two separate ovaries.
    • At the end of a pregnancy in one uterus, a new embryo develops in the other uterus.
    • Kangaroos and wallabies regularly have an embryo in the uterus, a young joey in the pouch, and a third semi-dependent young at foot, still drinking its mother’s milk.

    How it is different from Kangaroo?

    • In kangaroos, the new embryo is conceived a day or two after the previous birth.
    • In the swamp wallaby (Wallabia bicolor), the new conception happens one or two days before the previous joey is delivered.

    What happens after?

    • As soon as the mature foetus is born and settles in the pouch, the swamp wallaby arrests the development of the new embryo.
    • This is called embryonic diapause, which happens in many animals to pause reproduction until the conditions are right — season, climate, food availability.
    • For wallabies, this is also to ensure that the new one is born only when the pouch is free again.
    • If this did not happen, the swamp wallaby would be birthing new young every 30 days — it has a short gestation period — and its pouch could not support that.

  • Hazards of using fertilizers in Punjab

     

    Studies have pegged consumption of phosphatic fertilizers in Punjab at ten times higher than the national average. Thence media has consistently reported on cancer deaths in the Malwa region of Punjab.

    What are phosphatic fertilizers?

    • Phosphatic fertilizers are chemical substances that contain the nutrient phosphorus in an absorbable form (Phosphate anions) or that yield after conversion in the soil.
    • Phosphates help plants store energy, root well, flower and produce fruit.
    • The DAP or Diammonium Phosphate is the widely used phosphatic fertilizer in our country.
    • The total fertilizer consumption in India is 27 million tones, out of which about 20-25 per cent of phosphorous and nitrogen-based nutrients are dependent on imports from the United States, Jordan, Iran, Oman, China, Russia, Morocco, Israel, Lithuania and Egypt.

    Hazards of phosphatic fertilizers

    • Pursuant to the disquieting reports from the area, BARC in 2013 analysed fertilizer and soil samples from the Malwa region and discovered heavy concentration of Uranium.
    • According to the report, Uranium concentration in DAP was around 91.77 parts per million (ppm), which was way beyond the permissible limit.
    • It is also a fact that the fertiliser industry in India does not follow all procedures and protocols essential for decontamination of imported phosphatic rock associated with traces of Uranium.
    • There is yet another theory which does not support the fertiliser route for Uranium ingestion through food chain, but emphasises on the geogenic factors for the possible presence of Uranium in the groundwater samples.
    • Higher concentrations of Uranium are present in certain types of soils and rocks, especially granite.
    • All the three isotopes of Uranium (U-234, U-235, U-238) have a half-life period ranging from 0.25 million years to 4.47 billion years, indicating their relative stability.

    Increasing Uranium contamination

    • Presence of Uranium is widespread, and according to the United Nations Scientific Committee on the Effects of Atomic Radiation, its normal concentration in soil is between 300 microgram per kg (ug/kg) and 11.7 milligram per kg (mg/kg).
    • In the Indian context, contamination of Uranium in Punjab’s groundwater has been a problem since the early 2000s.
    • High levels of uranium found in the fertile Malwa region along with industrial effluents leads to a bigger problem as it contaminates the groundwater.
    • The presence of bicarbonates, nitrate, chloride anions and soil is calcareous since the carbonic acid created in the process enhances leaching efficiency of uranium from soils and sediments.

    Matter of urgent importance

    • With no guidelines or acceptable standards by Central Pollution Control Board (CPCB) regarding the amount of uranium in fertilizers produced in India, we are on a dead track.
    • Authorities’ concerned need to take cognizance and invest in less expensive R&D of the decontamination process.
    • At the same time, it is also necessary to specify the acceptable limit of Uranium in groundwater.

    Back2Basics

    Complete details of fertilizers

    http://agritech.tnau.ac.in/agriculture/agri_nutrientmgt_fertilizers.html