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Subject: Geography

  • [pib] International Monsoons Project Office (IMPO)

    Union Minister of Science & Technology has launched the International Monsoons Project Office (IMPO).

    International Monsoons Project Office (IMPO)

    • IMPO will be hosted at the Indian Institute of Tropical Meteorology (IITM), Pune, an institution under the Ministry of Earth Sciences, Govt of India, initially for five years.
    • Setting up the IMPO reiterates the importance of monsoons for the national economy.
    • It would encompass activities and connections related to international monsoon research that would be identified and fostered under the leadership of the World Climate Research Programme.
    • Both the World Climate Research Programme and World Weather Research Programme are international programmes coordinated by the United Nations World Meteorological Organisation (WMO).

    Significance of IMPO

    • Setting up the IMPO in India would mean expanding an integrated scientific approach to solve the seasonal variability of monsoons, enhancing the prediction skill of monsoons and cyclones.
    • It would promote knowledge sharing and capacity building in areas of monsoon research crucial for agriculture, water resources and disaster management, hydropower and climate-sensitive socio-economic sectors.
    • It is a step towards making India a global hub for monsoon research and coordination in a seamless manner for addressing common and region-specific aspects of the monsoons around the world.

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    Back2Basics:

    Various terms related to Indian Monsoon

  • Places in news: Erra Matti Dibbalu

    Citizens join hands to preserve the geological marvel of Erra Matti Dibbalu in Visakhapatnam.

    What is Erra Matti Dibbalu?

    • Located between Visakhapatnam and Bheemunipatnam, the Erra Matti Dibbalu are rare red sand dunes that are a reminder of the million years of geological processes.
    • Its towering red sand dunes with patches of greenery is like a meandering maze.
    • The width of the dunes, which runs for five kilometres along the coast, varies from 200 metres to two kilometres.
    • It is listed among the 34 notified National Geological Heritage Monument Sites of India by the Geological Survey of India.

    (Don’t they resemble to Ravines of Chambal?)

    Its formation

    • Studies indicate that the area was tectonically active between 2.5 million years and 11,000 years ago.
    • The sediments are mainly derived from the Khondalite rocks from the hinterland of the Eastern Ghats.
    • Geologically these red sand dune sediments particularly hold significance.
    • They are the result of the combined effect of numerous factors including global climatic changes, sea-level variations, monsoonal variability and as a result serves as valuable paleo-environment indicators.

     

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  • What is the Pacific ‘Ring of Fire’?

    The Hunga Tonga-Hunga Ha’apai volcano which massively erupted lies along the Pacific ‘Ring of fire’, and is just over 60 kilometers from the island nation of Tonga.

    What is the Pacific ‘Ring of Fire’?

    • The Pacific ‘Ring of Fire’ or Pacific rim, or the Circum-Pacific Belt, is an area along the Pacific Ocean that is characterized by active volcanoes and frequent earthquakes.
    • Volcanic arcs and oceanic trenches partly encircling the Pacific Basin form the so-called Ring of Fire.
    • It is home to about 75 per cent of the world’s volcanoes – more than 450 volcanoes.
    • Also, about 90 per cent of the world’s earthquakes occur here.

    Its spread

    • Its length is over 40,000 kilometres and traces from New Zealand clockwise in an almost circular arc covering Tonga, Kermadec Islands, Indonesia.
    • It is moving up to the Philippines, Japan, and stretching eastward to the Aleutian Islands, then southward along the western coast of North America and South America.

    Seismic activity of the region

    • The area is along several tectonic plates including the Pacific plate, Philippine Plate, Juan de Fuca plate, Cocos plate, Nazca plate, and North American plate.
    • The movement of these plates or tectonic activity makes the area witness abundant earthquakes and tsunamis every year.
    • Along much of the Ring, tectonic plates move towards each other creating subduction zones.
    • One plate gets pushed down or is subducted by the other plate.
    • This is a very slow process – a movement of just one or two inches per year.
    • As this subduction happens, rocks melt, become magma and move to Earth’s surface and cause volcanic activity.

    What has happened in recent eruption in Tonga?

    • In the case of Tonga, the Pacific Plate was pushed down below the Indo-Australian Plate and Tonga plate, causing the molten rock to rise above and form the chain of volcanoes.
    • Subduction zones are also where most of the violent earthquakes on the planet occur.
    • The December 26, 2004 earthquake occurred along the subduction zone where the Indian Plate was subducted beneath the Burma plate.

     

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  • Undersea Volcanic Eruption in Hunga Islands, Tonga

    A distant undersea volcano has erupted in spectacular fashion near the Pacific nation of Tonga sending large tsunami waves reaching the shore.

    Hunga Volcano

    • The Hunga-Tonga-Hunga-Ha’apai volcano has erupted regularly over the past few decades.
    • It consists of two small uninhabited islands, Hunga-Ha’apai and Hunga-Tonga, poking about 100m above sea level 65km north of Tonga’s capital Nuku’alofa.
    • But hiding below the waves is a massive volcano, around 1800m high and 20 kilometres wide.
    • During events in 2009 and 2014/15 hot jets of magma and steam exploded through the waves. But these eruptions were small, dwarfed in scale by the January 2022 events.
    • Researchers suggest this is one of the massive explosions the volcano is capable of producing roughly every thousand years.

    Impact of the eruption

    • The ash plume is already about 20km high.
    • Most remarkably, it spread out almost concentrically over a distance of about 130km from the volcano, creating a plume with a 260km diameter, before it was distorted by the wind.
    • The eruption also produced a tsunami throughout Tonga and neighbouring Fiji and Samoa.
    • Shock waves traversed many thousands of kilometres, were seen from space, and recorded in New Zealand some 2000km away.
    • All these signs suggest the large Hunga caldera has awoken.

    Why is it so explosive even after being underwater?

    Answer: Fuel-coolant interaction

    • If magma rises into sea water slowly, even at temperatures of about 1200 degrees Celsius, a thin film of steam forms between the magma and water.
    • This provides a layer of insulation to allow the outer surface of the magma to cool.
    • But this process doesn’t work when magma is blasted out of the ground full of volcanic gas.
    • When magma enters the water rapidly, any steam layers are quickly disrupted, bringing hot magma in direct contact with cold water.
    • Volcano researchers call this ‘fuel-coolant interaction’ and it is akin to weapons-grade chemical explosions.

    A chain reaction

    • Extremely violent blasts tear the magma apart.
    • A chain reaction begins, with new magma fragments exposing fresh hot interior surfaces to water, and the explosions repeat, ultimately jetting out volcanic particles and causing blasts with supersonic speeds.

    How has it emerged out to be so big?

    • The caldera is a crater-like depression around 5km across.
    • Small eruptions (such as in 2009 and 2014/15) occur mainly at the edge of the caldera, but very big ones come from the caldera itself.
    • These big eruptions are so large the top of the erupting magma collapses inward, deepening the caldera.
    • Looking at the chemistry of past eruptions, we now think the small eruptions represent the magma system slowly recharging itself to prepare for a big event.

    What next?

    • This latest eruption has stepped up the scale in terms of violence.
    • Researchers are still in the middle of this major eruptive sequence and many aspects remain unclear, partly because the island is currently obscured by ash clouds.

     

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  • Places in news: Darvaza Gas Crater

    Turkmenistan President has ordered experts to find a way to extinguish a fire in a huge natural gas crater, the Darvaza gas crater also known as the ‘Gateway to Hell’.

    Darvaza Gas Crater

    • Located in the Karakum desert, 260 kilometres away from Turkmenistan’s capital, Ashgabat, the crater has been burning for the last 50 years.
    • The crater is 69 metres wide and 30 metres deep.
    • While the details of the origin of the crater are contested but it has been said that the crater was created in 1971 during a Soviet drilling operation.
    • In 1971, Soviet geologists were drilling for oil in the Karakum desert when they hit a pocket of natural gas by mistake, which caused the earth to collapse and ended up forming three huge sinkholes.

    Why is it flamed?

    • This pocket of natural gas contained methane, hence to stop that methane from leaking into the atmosphere, the scientists lit it with fire, assuming the gas present in the pit would burn out within a few weeks.
    • The scientists seemed to have misjudged the amount of gas present in the pit, because the crater has been on fire for five decades now.

    A popular tourist attraction

    • The crater has become a significant tourist attraction in Turkmenistan.
    • In 2018, the country’s president officially renamed it as the “Shining of Karakum”.

    Why did Turkmenistan order to extinguish it?

    • Calling it a human-made crater, it has negative effects on both environment and the health of the people living nearby.
    • It also ends up losing valuable natural resources for which could fetch significant profits.

    How harmful are methane leaks?

    • Methane is the primary contributor to the formation of ground-level ozone, a hazardous air pollutant and greenhouse gas, exposure to which causes 1 million premature deaths every year.
    • Methane is also a powerful greenhouse gas. Over a 20-year period, it is 80 times more potent at warming than carbon dioxide.

    Back2Basics: TAPI Gas Pipeline

    • The Turkmenistan–Afghanistan–Pakistan–India (TAPI) Pipeline is a natural gas pipeline being developed with the participation of the Asian Development Bank.
    • It will be a 1,814km trans-country natural gas pipeline running across four countries.
    • It will transport natural gas from the Galkynysh Gas Field in Turkmenistan through Afghanistan into Pakistan and then to India.
    • The plan for the TAPI project was originally conceived in the 1990s to generate revenue from Turkmenistan’s gas reserves by exporting natural gas via Afghanistan to Pakistan and India.
    • Construction on the project started in Turkmenistan on 13 December 2015, work on the Afghan section began in February 2018, and work on the Pakistani section was planned to commence in December 2018.
    • Presently, the construction work has been stalled due to terror activities of Taliban in Afghanistan since few years.

     

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  • India’s first open Rock Museum in Hyderabad

    The Ministry of Science & Technology has inaugurated India’s first open rock museum displaying different types of rocks gathered from different States of ages ranging from 3.3 billion years to around 55 million years.

    Rock System in India

    Based on this complex and varied geological history, the Geological Survey of India has classified rock systems of the country into 4 major divisions:

    1. Archaean Rock System
    2. Dravidian Rock System
    3. Purana Rock System
    4. Aryan Rock System

    [I] Archaean Rock System:

    The Archaean group of rocks consists of two systems-(a) Achaean granites and gneisses, and (b) Dharwarian sedimentary:

    Archaean Gneisses and Schists (pre-2500 million years)

    • The Archean System contains the first formed rocks of the earth.
    • The rocks are primarily gneisses and granites, having no marks of fossils.
    • They often underlie the strata formed subsequently and the system is generally known as the basement complex or fundamental gneisses.
    • The Archaean rocks cover two-thirds of peninsular India. They also occur in the roots of the mountain peaks all along the Greater Himalayas, trans-Himalayan ranges of Zaskar, Ladakh and Karakoram.

    Dharwar System (2500-1800 million years ago)

    • The weathering of the Archaean rocks yielded the earliest sediments and formed the oldest sedimentary strata, the Dharwar system.
    • These are found today in metamorphic forms and do not contain fossils.
    • These rocks occur in scattered patches in parts of Karnataka, Tamil Nadu, central and eastern parts of Chotanagpur plateau, Meghalaya plateau, Aravalis, Himalayan region etc

    Mineral contents:

    • They contain gneisses (which range from granite to gabbro) and schists (crystalline rocks such as mica, talc etc.).
    • These rocks have metallic and non-metallic minerals like copper, tin, graphite, lead, zinc, etc.

    [II] Dravidian Rock System:

    • This is also known as carboniferous rock system and formed during the Paleozoic era, i.e., from 600- 300 million years ago.
    • They are not much abundant in India.
    • They have plentiful fossils and beginning of coal formation can be seen in this period. The quality of carboniferous coal is high.
    • They are found in extra- Peninsular regions of the Himalayas and the Gangetic plains.

    Mineral content

    • This type of rock system comprises of limestones, shale and quartzite and Mount Everest is formed of upper Carboniferous limestones.
    • Most of the coal is not of the Carboniferous period, which is found in India.
    • The meaning of Carboniferous in geology is coal-bearing.

    [III] Purana Rock System:

    The Purana rock system has two divisions: Cuddapah system and Vindhyan system. The word ‘Purana’ was used in place of a Proterozoic era in India.

    Cuddapah Rock system:

    • They are observed in Cuddapah districts of Andhra Pradesh.
    • The non-fossiliferous clay, slates, sandstones and limestones were accumulated in the depression between two-fold mountains which is known as synclinal basins.
    • They also have a large accumulation of building purpose cement grade limestones and quartzites.
    • This type of rock contains ore of iron, cobalt, nickel, manganese etc.

    Vindhya Rock System:

    • This type of rock system is also ancient or old sedimentary rocks which are superimposed on the Archaean rock base and derived its name from Vindhya mountains.
    • The recognition of fossils is negligible, only traces of few animal and plant life were found.
    • This rock system has diamond-bearing regions from which Golconda and Panna diamond mined.

    [IV] Aryan Rock System

    The Aryan rock system in India has the following four subsystems:

    1. Gondwana rock system
    2. Jurassic Rock System
    3. Cretaceous system/ Deccan Trap
    4. Tertiary rock system

    (1) Gondwana Rock System:

    • These are found mainly in Raniganj, Jharia regions of Jharkhand, Damodar valley, Pench valley in Chhattisgarh and Madhya Pradesh.
    • They are called so after the name of Gondwana tribe (indigenous people especially residing in Telangana and Andhra Pradesh region).
    • In this type of rock system, you found metallic minerals like iron, manganese, uranium etc. other than coal.
    • They have low carbon content as it is much younger than Carboniferous coal. These rocks have nearly 98% of India’s coal reserve.

    (2) Jurassic Rock System

    • During the latter part of Jurrasic when sea level rises as compared to land and shoreline moves towards ground or land which result in a flood. In geology, this phenomenon is called marine transgression.
    • This gives rise to a thick series of shallow-water deposits kin Rajasthan and Kutch. Between the Guntur and Rajamundry, another transgression in the east coast of Peninsula.
    • In Kuchchh, coral limestone, shales and conglomerates are found.

    (3) Deccan traps

    • These are formed by the flow of magma over the solidified rock system in layers.
    • Deccan trap gets rise due to volcanic outburst over a major area of Peninsular India from the end of Cretaceous till the beginning of Eocene.
    • The meaning of trap is “stair” or “step” in Swedish and called due to deposition of the volcanic outburst which has a flat top and steep sides.
    • It is mainly found in parts of Kuchchh, Saurashtra, Maharashtra, the Malwa plateau and Northern Karnataka and presently cover near 5 lakh sq. Km.
    • Regur, which is black soil, is formed due to the weathering of these rocks for a long time.

    (4) Tertiary rock system

    • The formation of this type of rock system occurs from 60 to 7 million years ago.
    • It is the most noteworthy period in India’s geological history as the Himalayas were born and recent form came in this period.

    Also read:

    The Geological Structure of India

     

     

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  • Western Disturbances to bring rain in New Delhi

    Under the influence of two consecutive western disturbances, New Delhi is in for a wet spell.

    Western Disturbances

    • A western disturbance is an extratropical storm originating in the Mediterranean region that brings sudden winter rain to the northwestern parts of the Indian subcontinent.
    • It is a non-monsoonal precipitation pattern driven by the westerlies.
    • The moisture in these storms usually originates over the Mediterranean Sea, the Caspian Sea and the Black Sea.
    • Extratropical storms are global phenomena with moisture usually carried in the upper atmosphere, unlike their tropical counterparts where the moisture is carried in the lower atmosphere.
    • In the case of the Indian subcontinent, moisture is sometimes shed as rain when the storm system encounters the Himalayas.
    • Western disturbances are more frequent and strong in the winter season.

    Impact: Winter Rainfall and Extreme Cold

    • Western disturbances, specifically the ones in winter, bring moderate to heavy rain in low-lying areas and heavy snow to mountainous areas of the Indian Subcontinent.
    • They are the cause of most winter and pre-monsoon season rainfall across northwest India.
    • An average of four to five western disturbances forms during the winter season.

    Its significance

    • Precipitation during the winter season has great importance in agriculture, particularly for the rabi crops.
    • Wheat among them is one of the most important crops, which helps to meet India’s food security.

    Try this PYQ:

    Q. Consider the following statements:

    1. The winds which blow between 30°N and 60°S latitudes throughout the year are known as westerlies.
    2. The moist air masses that cause winter rains in the North-Western region of India are part of westerlies.

    Which of the statements given above is/are correct?

    (a) Only 1

    (b) Only 2

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

     

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  • Recurring urban floods point to need for moving away from land-centric urbanism

    Context

    Flood in Chennai has revived memories of the devastating Chennai floods of 2015, a collective trauma that its residents are yet to outlive.

    Role of climate change

    • In August this year, as monsoon floods raged across the subcontinent, IPCC’s 6th Assessment Report (AR6) was published.
    • The report noted the increasing frequency of heavy precipitation events since the 1950s and inferred that they were being driven by human-induced climate change.
    • The climate crisis, is here.
    • It has made extreme rainfall events more severe and unpredictable than ever before.

    Role of poor planning and encroachment

    • In 2015, the National Green Tribunal in India formed a committee to report on the status of natural stormwater drains in Delhi.
    • On inspection, out of the 201 “drains” recorded in 1976, 44 were found to be “missing.
    • Geospatial imaging established that 376 km of natural storm drains — encroached on and paved over — had disappeared from Bengaluru.
    • In both cases, these “missing” waterways were either encroached and built over or connected to sewage drains.
    • Poor design and corruption significantly contribute to urban floods.
    • By violating environmental laws and municipal bye-laws, open spaces, wetlands and floodplains have been mercilessly built over, making cities impermeable and hostile to rainwater.

    Way forward

    • We need to move away from land-centric urbanisation and recognise cities as waterscapes.
    • We need to let urban rivers breathe by returning them to their floodplains.
    • The entire urban watershed needs to heal, and for that to happen, we need less concrete and more democracy and science at the grassroots.

    Conclusion

    Ever since concretisation became shorthand for urbanisation, rainfall in a changing climate no longer finds its way towards subterranean capillaries or surface water bodies.

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  • Earth’s first landmass emerged in Singhbhum: Study

    A new study has challenged the widely accepted view that the continents rose from the oceans about 2.5 billion years ago.

    About Singhbhum

    • Singhbhum district of Jharkhand is part of the Chhota Nagpur Division.
    • It is one of the leading producers of copper in India.

    First landmass to emerge

    • The study suggests that the earliest continental landmass to emerge may have been Jharkhand’s Singhbhum region.
    • Scientists have found sandstones in Singhbhum with geological signatures of ancient river channels, tidal plains and beaches over 3.2 billion years old.
    • They somewhat represent the earliest crust exposed to air.

    Studying the sandstones

    • The research studies a sedimentary rock, called granite. They tried to find their age and in which conditions they have formed.
    • They found the age by analysing the uranium and lead contents of tiny minerals.
    • These rocks are 3.1 billion years old, and were formed in ancient rivers, beaches, and shallow seas.
    • All these water bodies could have only existed if there was continental land.
    • Thus, they inferred that the Singhbhum region was above the ocean before 3.1 billion years ago.

    How did they analyse?

    • The researchers studied the granites that form the continental crust of Singhbhum region.
    • These granites are 3.5 to 3.1 billion years old and formed through extensive volcanism that happened about 35-45 km deep inside the Earth.
    • This process continued on-and-off for hundreds of millions of years until all the magma solidified to form a thick continental crust in the area.
    • Due to the thickness and less density, the continental crust emerged above surrounding oceanic crust owing to buoyancy.

    Back2Basics: Emergence of Landmass

    • In the beginning, more than 4.6-billion years ago, the world was a ball of burning gas, spinning through space.
    • It took hundreds of millions of years for the first land masses to emerge.
    • About 250-million years ago, long, long after the Earth had formed, all the continents of the time had joined together to form a super-continent called Pangaea.
    • This super-continent broke up about 200-million years ago to form two giant continents, Gondwana and Laurasia.
    • Gondwana comprised what is now Africa, South America, Australia, Antarctica and India.
    • The Indian sub-continent lay off the east coast of Africa, before it broke off and moved north rapidly.

    Isostacy

    • Huge plates of crustal and upper mantle material (lithosphere) “float” on more dense, plastically flowing rocks of the asthenosphere.
    • The “depth” to which a plate, or block of crust, sinks is a function of its weight and varies as the weight changes.
    • This equilibrium, or balance, between blocks of crust and the underlying mantle is called isostasy.
    • The taller a block of crust is, the deeper it penetrates into the mantle because of its greater mass and weight. Isostasy occurs when each block settles into an equilibrium with the underlying mantle.
    • Blocks of crust that are separated by faults will “settle” at different elevations according to their relative mass.

     

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  • Sixth Mass Extinction?

    A paper published recently has come up with a new reason behind the first mass extinction, also known as the Late Ordovician mass extinction.

    Species Extinction

    • Extinction is a part of life, and animals and plants disappear all the time. About 98% of all the organisms that have ever existed on our planet are now extinct.
    • When a species goes extinct, its role in the ecosystem is usually filled by new species, or other existing ones.

    What is Mass Extinction?

    • Earth’s ‘normal’ extinction rate is often thought to be somewhere between 0.1 and 1 species per 10,000 species per 100 years.
    • This is known as the background rate of extinction.
    • A mass extinction event is when species vanish much faster than they are replaced.
    • This is usually defined as about 75% of the world’s species being lost in a ‘short’ amount of geological time – less than 2.8 million years.

    How many mass extinctions have there been?

    Five great mass extinctions have changed the face of life on Earth. We know what caused some of them, but others remain a mystery:

    [I] Ordovician-Silurian ME

    • It occurred 443 million years ago and wiped out approximately 85% of all species.
    • Scientists think it was caused by temperatures plummeting and huge glaciers forming, which caused sea levels to drop dramatically.
    • This was followed by a period of rapid warming. Many small marine creatures died out.

    [II] Devonian ME

    • It took place 374 million years ago and killed about three-quarters of the world’s species, most of which were marine invertebrates that lived at the bottom of the sea.
    • This was a period of many environmental changes, including global warming and cooling, a rise and fall of sea levels and a reduction in oxygen and carbon dioxide in the atmosphere.
    • We don’t know exactly what triggered the extinction event.

    [III] Permian ME

    • It happened 250 million years ago, was the largest and most devastating event of the five.
    • Also known as the Great Dying, it eradicated more than 95% of all species, including most of the vertebrates which had begun to evolve by this time.
    • Some scientists think Earth was hit by a large asteroid which filled the air with dust particles that blocked out the Sun and caused acid rain.
    • Others think there was a large volcanic explosion that increased carbon dioxide and made the oceans toxic.

    [IV] Triassic ME

    • It took place 200 million years ago, eliminating about 80% of Earth’s species, including many types of dinosaurs.
    • This was probably caused by colossal geological activity that increased carbon dioxide levels and global temperatures, as well as ocean acidification.

    [V] Cretaceous ME

    • It occurred 65 million years ago, killing 78% of all species, including the remaining non-avian dinosaurs.
    • This was most likely caused by an asteroid hitting the Earth in what is now Mexico, potentially compounded by ongoing flood volcanism in what is now India.

    What caused first ME?

    • The cooling climate likely changed the ocean circulation pattern.
    • This caused a disruption in the flow of oxygen-rich water from the shallow seas to deeper oceans, leading to a mass extinction of marine creatures.
    • Ordovician Sea has familiar groups like clams and snails and sponges.
    • Many other groups are now very reduced in diversity or entirely extinct like trilobites, brachiopods, and crinoids.

    The sixth mass extinction

    • We are currently experiencing a sixth mass extinction as the result of human-induced climate change.
    • There have been several theories behind each mass extinction and with advances in new technologies, researchers have been uncovering more intricate details about these events.

    Try this PYQ from CSP 2018

    The term “sixth mass extinction/sixth extinction” is often mentioned in the news in the context of the discussion of:

     

    (a) Widespread monoculture Practices agriculture and large-scale commercial farming with indiscriminate use of chemicals in many parts of the world that may result in the loss of good native ecosystems.

    (b) Fears of a possible collision of a meteorite with the Earth in the near future in the manner it happened 65million years ago that caused the mass extinction of many species including those of dinosaurs.

    (c) Large scale cultivation of genetically modified crops in many parts of the world and promoting their cultivation in other Parts of the world may cause the disappearance of good native crop plants and the loss of food biodiversity.

    (d) Mankind’s over-exploitation/misuse of natural resources, fragmentation/loss, natural habitats, destruction of ecosystems, pollution and global climate change.

     

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