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

Civilsdaily

Login

Subject: Climate Change

1. Global Warming and Issues
2. All about Pollution

  • [pib] Centre launches Secured Logistics Document Exchange (SLDE) and GHG Calculator

    With an aim to further improve ease of doing business, Centre today launched the “Secured Logistics Document Exchange” along with a Calculator for Green House Gas Emissions.

    Secured Logistics Document Exchange (SLDE)

    • The SLDE platform is a solution to replace the present manual process of generation, exchange and compliance of logistics documents with a digitized, secure and seamless document exchange system.
    • It is set to improve logistics efficiency, reduce logistics cost, and promote multi-modality and sustainability in a big way.
    • This will enable generation, storage and interchange of logistics-related documents digitally using Aadhaar and blockchain-based security protocols for data security and authentication.
    • It will also provide a complete audit trail of document transfer, faster execution of transaction, lower cost of shipping and overall carbon footprint, easy verification of authenticity of documents, lowered risk of fraud, etc.
    • The proof of concept of the platform has been developed and executed with banks (ICICI, Axis Bank, State Bank of India and HDFC Bank) and stakeholders including freight forwarders, exporters, importers and vessel operators.

    Green House Gas (GHG) Emission Calculator

    • The GHG Calculator is an efficient, user-friendly tool and provides for calculating and comparing GHG emissions across different modes.
    • It allows for a commodity-wise comparison of GHG emissions and total cost of transportation, including their environmental cost, between movement by road and rail.
    • The tool is intended to facilitate appropriate modal choice for all concerned.

    Back2Basics: Green House Gases (GHGs)

    • A greenhouse gas (GHG) is a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect.
    • The primary greenhouse gases in Earth’s atmosphere are water vapor (H 2O), carbon dioxide (CO 2), methane (CH 4), nitrous oxide (N 2O), and ozone (O3).
    • Without greenhouse gases, the average temperature of Earth’s surface would be about −18 °C (0 °F), rather than the present average of 15 °C (59 °F).
    • The atmospheres of Venus, Mars, and Titan also contain greenhouse gases.

  • Places in news: Great Barrier Reef

    Chinese official has said that political tensions between Beijing and Australia were not behind a UNESCO recommendation to place the Great Barrier Reef on its endangered list.

    Great Barrier Reef

    • The Great Barrier Reef is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands.
    • It is stretched for over 2,300 kilometres over an area of approximately 344,400 square kilometres.
    • The reef is located in the Coral Sea, off the coast of Queensland, Australia.
    • It was world heritage listed in 1981 by UNESCO as the most extensive and spectacular coral reef ecosystem on the planet.

    Importance of Corals

    Coral reefs are some of the most diverse and valuable ecosystems on Earth.

    • They support more species per unit area than any other marine environment, including about 4,000 species of fish, 800 species of hard corals and hundreds of other species.
    • This biodiversity is considered key to finding new medicines for the 21st century.
    • Medical use: Many drugs are now being developed from coral reef animals and plants as possible cures for cancer, arthritis, human bacterial infections, viruses, and other diseases.
    • Fisheries: Healthy coral reefs support commercial and subsistence fisheries as well as jobs and businesses through tourism and recreation.
    • Local economies receive billions of dollars from visitors to reefs through diving tours, recreational fishing trips, hotels, restaurants, and other businesses based near reef ecosystems.
    • Coral reef structures also buffer shorelines against 97 per cent of the energy from waves, storms, and floods, helping to prevent loss of life, property damage, and erosion.

    Answer this PYQ in the comment box:

    Q.Consider the following statements:

    1. Most of the world’s coral reefs are in tropical waters.
    2. More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and the Philippines.
    3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.

    Which of the above statements is/are correct?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1 and 3 only

    Back2Basisc: Coral Reef

    • Coral reefs are built by and made up of thousands of tiny animals—coral “polyps”—that are related to anemones and jellyfish.
    • Polyps are shallow-water organisms that have a soft body covered by a calcareous skeleton. The polyps extract calcium salts from seawater to form these hard skeletons.
    • The polyps live in colonies fastened to the rocky seafloor.
    • The tubular skeletons grow upwards and outwards as a cemented calcareous rocky mass collectively called corals.
    • When the coral polyps die, they shed their skeleton on which new polyps grow.
    • The cycle is repeated for millions of years leading to the accumulation of layers of corals shallow rock created by these depositions is called a reef.

  • Why the Amazon forests are no longer acting as a carbon sink

    The Amazon forests in South America, which are the largest tropical forests in the world, have started emitting carbon dioxide (CO2) instead of absorbing carbon emissions.

    Note the countries bordered by the Amazon forests.

    Amazon forests

    • The Amazon rainforest is a moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America.
    • This basin encompasses 7,000,000 sq km of which 5,500,000 sq km are covered by the rainforest.
    • The majority of the forest is contained within Brazil, with 60% of the rainforest, followed by Peru with 13%, Colombia with 10%, and with minor amounts in Bolivia, Ecuador, French Guiana, Guyana, Suriname, and Venezuela.
    • It represents over half of the planet’s remaining rainforests and comprises the largest and most biodiverse tract of tropical rainforest in the world.

    Why in news?

    • A significant amount of deforestation in eastern and southeastern Brazil has turned the forest into a source of CO2 that has the ability to warm the planet.
    • Not only the Amazon rainforests, some forests in Southeast Asia have also turned into carbon sources in the last few years as a result of the formation of plantations and fires.

    What have the researchers found?

    • Over the years as fossil-fuel emissions across the world have increased, the Amazon forests have absorbed CO2 from the atmosphere, helping to moderate the global climate.
    • But researchers are not saying that because of significant levels of deforestation (over the course of 40 years) there has been a long-term decrease in rainfall and increase in temperatures during the dry season.
    • Because of these reasons the eastern Amazon forests are no longer carbon sinks, whereas the more intact and wetter forests in the central and western parts are neither carbon sinks nor are they emitters.
    • Another reason for the eastern region not being able to absorb as much CO2 as it did previously is the conversion of forests into agricultural land.

  • Arctic’s ‘Last Ice Area’

    A part of the Arctic’s ice called the “Last Ice Area”, located north of Greenland, has melted before expected. Scientists had believed this area was strong enough to withstand global warming.

    What is the Last Ice Area?

    • In an article published in 2015, National Geographic noted that climate projections forecast the total disappearance of summer ice in the Arctic by the year 2040.
    • However, the only place that would be able to withstand a warming climate would be this area of ice called the “Last Ice Area”.
    • But while this piece of ice above northern Canada and Greenland was expected to last the longest time, it is now showing signs of melting.
    • WWF claims that WWF-Canada was the first to call this area the‘ Last Ice Area’.

    Why is the area important?

    • The area is important because it was thought to be able to help ice-dependent species as ice in the surrounding areas melted away.
    • The area is used by polar bears to hunt for seals who use ice to build dens for their offspring.
    • Walruses too, use the surface of the ice for food search.

    When did the area start changing?

    • The first sign of change in LIA was observed in 2018.
    • Further, in August last year, sea ice showed its “vulnerability” to the long-term effects of climate change.
    • The ice in LIA has been thinning gradually over the years much like other parts of the Arctic Ocean.

    What are the reasons that explain the change?

    • About 80 per cent of thinning can be attributed to weather-related factors such as winds that break up and move the ice around.
    • The remaining 20 per cent can be attributed to the longer-term thinning of the ice due to global warming.

  • Lowering Emissions by Accelerating Forest Finance (LEAF) Coalition

    At the recently concluded Leaders’ Summit on Climate in April 2021, the Lowering Emissions by Accelerating Forest Finance (LEAF) Coalition was announced.

    LEAF Coalition

    • LEAF Coalition is a collective of the US, UK and Norway governments.
    • It is a public-private effort, thus supported by transnational corporations (TNCs) like Unilever plc, Amazon, Nestle, Airbnb etc.
    • It came up with a $1 billion fund plan that shall be offered to countries committed to arresting the decline of their tropical forests by 2030.
    • The LEAF coalition initiative is a step towards concretizing the aims and objectives of the Reducing Emissions from Deforestation and Forest Degradation (REDD+) mechanism.

    How does this coalition work?

    • The LEAF Coalition can help reverse the trend by providing unprecedented financial support to tropical forest governments implementing forest protection, contributing to green and resilient growth through sustainable investments.
    • It empowers tropical and subtropical forest countries to move more rapidly towards ending deforestation while supporting them in achieving their Nationally Determined Contributions (NDCs) under the Paris Agreement.
    • Reductions in emissions are made across entire countries or large states and provinces (“jurisdictions”) through programs that involve all key stakeholders, including Indigenous peoples and local communities.

    Why is it significant?

    • Financial impetus is crucial as it incentivizes developing countries to capture extensive deforestation and provide livelihood opportunities to forest-dependent populations.
    • The initiative comes at a crucial time when the tropics have lost close to 12.2 million hectares (mha) of tree cover year last year according to global estimates released by Global Forest Watch.
    • Most of these lost forests were located in the developing countries of Latin America, Africa and South Asia.
    • India’s estimated loss in 2020 stands at 20.8-kilo hectares due to forest fires

    What lies next?

    • Implementation of the LEAF Coalition will help pump in fresh rigour among developing countries like India, that are reluctant to recognize the contributions of their forest-dwelling populations in mitigating climate change.
    • With the deadline for proposal submission fast approaching, India needs to act swiftly on a revised strategy.
    • Although India has pledged to carry out its REDD+ commitments, it is impossible to do so without seeking knowledge from its forest-dwelling population.

    Answer this PYQ in the comment box:

    With reference to ‘Forest Carbon Partnership Facility’, which of the following statements is/ are correct?  (CSP 2013)

    1. It is a global partnership of governments, businesses, civil society and indigenous peoples.
    2. It provides financial aid to universities, individual scientists and institutions involved in scientific forestry research to develop eco-friendly and climate adaptation technologies for sustainable forest management.
    3. It assists the countries in their ‘REDD+ (Reducing Emissions from Deforestation and Forest Degradation+)’ efforts by providing them with financial and technical assistance.

    Select the correct answer using the code given below:

    (a) 1 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3

    Back2Basics: REDD+

    • REDD+ is a mechanism developed by Parties to the United Nations Framework Convention on Climate Change (UNFCCC).
    • It creates a financial value for the carbon stored in forests by offering incentives for developing countries to reduce emissions from forested lands and invest in low-carbon paths to sustainable development.
    • Developing countries would receive results-based payments for results-based actions.
    • REDD+ goes beyond simply deforestation and forest degradation and includes the role of conservation, sustainable management of forests and enhancement of forest carbon stocks.
    • It aims to create incentives for communities so that they stop forest degrading practices.

  • What is the ‘Heat Dome’ causing record temperatures in USA?

    A US city has recorded the highest temperatures as high as 46-degree Celsius part due to the historic heatwave that lasted as a result of a phenomenon referred to as a “heat dome”.

    What is a Heat Dome?

    • To understand what causes a heat dome, one should liken the Pacific Ocean to a large swimming pool in which the heater is turned on.
    • Once the heater is on, the portions of the pool close to the heating jets will warm up faster and therefore, the temperature in that area will be higher.
    • In the same way, the western Pacific ocean’s temperatures have increased in the past few decades and are relatively more than the temperature in the eastern Pacific.
    • This strong change in ocean temperature from the west to the east is what a team of scientists believe is the reason for the heat dome.
    • This occurs when the atmosphere traps heat at the surface, which encourages the formation of a heatwave.
    • To compare, the reason that the planet Venus is the hottest in the Solar System is that its thick, dense cloud cover traps the heat at the surface, leading to temperatures as high as 471 degrees Celsius.

    Is this heat wave a result of climate change?

    • It cannot be said for sure if the heatwave is a direct result of global warming.
    • Scientists are usually wary of linking climate change to any contemporary event mainly because of the difficulty in completely ruling out the possibility of the event having been caused by some other reason.
    • Similarly, scientists who have been studying the climate tend to agree that the heat waves occurring today are more likely to be a result of climate change for which humans are responsible.

    Answer this PYQ in the comment box:

    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 100C 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

  • [pib] Glacial Lake Atlas of Ganga River Basin

    The Ministry of Jal Shakti has released the Glacial Lake Atlas of Ganga Basin.

    Glacial Lake Atlas

    • The atlas is based on the inventoried glacial lakes in part of the Ganga River basin from its origin to the foothills of the Himalayas covering a catchment area of 2,47,109 sq. km.
    • The study portion of the Ganga River basin covers part of India and the transboundary region.
    • The Atlas is available on National Hydrology Project or NHP-Bhuvan Portal.
    • It can be used by water resources professionals, researchers, disaster management authorities and other stakeholders for managing the glacial lakes as well as to mitigate the possible adverse impacts of GLOF and climate change.

    Expected utility of the atlas is:

    • The atlas provides a comprehensive and systematic glacial lake database for Ganga River basin with size > 0.25 ha
    • In the context of climate change impact analysis, the atlas can be used as reference data for carrying out change analysis, both with respect to historical and future time periods
    • The atlas also provides authentic database for regular or periodic monitoring changes in spatial extent (expansion/shrinkage), and formation of new lakes
    • The atlas can also be used in conjunction with glacier information for their retreat and climate impact studies.
    • The information on glacial lakes like their type, hydrological, topographical, and associated glaciers are useful in identifying the potential critical glacial lakes and consequent GLOF risk.
    • Central and State Disaster Management Authorities can make use of the atlas for disaster mitigation planning and related program.

    Answer this PYQ in the comment box:

    Q.Consider the following Pairs :

    Glacier: River

    1. Bandarpunch : Yamuna
    2. Bara Shigri : Chenab
    3. Milam : Mandakini
    4. Siachen : Nubra
    5. Zemu : Manas

    Which of the following pairs given above are correctly matched? (CSP 2019)

    (a) 1,2 and 4

    (b) 1,3 and 4

    (c) 2 and 5

    (d) 3 and 5

  • Places in news: Yellowstone National Park

    A new assessment of climate change in the Yellowstone National Park shows that it has lost a quarter of its annual snowfall.

    Yellowstone National Park

    • Yellowstone NP is an American national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho.
    • Yellowstone was the first national park in the US and is also widely held to be the first national park in the world.
    • The park is known for its wildlife and its many geothermal features, especially Old Faithful geyser, one of its most popular.
    • While it represents many types of biomes, the subalpine forest is the most abundant. It is part of the South Central Rockies forests ecoregion.
    • The area also represents the one point where the three major river basins of the western U.S. converge.
    • The rivers of the Snake-Columbia basin, Green-Colorado basin, and Missouri River Basin all begin as snow on the Continental Divide as it weaves across Yellowstone’s peaks and plateaus.

    Impact of climate change

    • Since 1950, average temperatures in the Greater Yellowstone Area have risen 1.3°C and potentially, more importantly, the region has lost a quarter of its annual snowfall.
    • The loss of snow there has repercussions for a vast range of ecosystems and wildlife, as well as cities and farms downstream that rely on rivers that start in these mountains.
    • It is home to the southernmost range of grizzly bear populations in North America and some of the longest intact wildlife migrations, including the seasonal traverses of elk, pronghorn, mule deer and bison.

    Answer this PYQ in the comment box:

    Q.Consider the following pairs:

    River                              Flows into

    1. Mekong –                   Andaman Sea

    1. Thames –                     Irish Sea
    2. Volga –                     Caspian Sea
    3. Zambezi –                  Indian Ocean

    Which of the statements given above is/are correct? (CSP 2020)

    (a) 1 and 2 only

    (b) 3 only

    (c) 3 and 4 only

    (d) 1,2 and 4 only

  • Retreating Monsoon is a global phenomenon: Study

    Rainfall during retreating monsoon, which parts of South India experience every year, is not a local anomaly and is global in nature and scale, according to a recent study by the University of Sydney.

    What is Retreating Monsoon?

    • In India, retreating monsoon is the withdrawal of south-west monsoon winds from North India.
    • The withdrawal is gradual and takes about three months.
    • With the retreat of the monsoons, the clouds disappear and the sky becomes clear. The day temperature starts falling steeply.
    • Monsoon rains weaken all over India except few southeastern states.
    • It is helpful in Rabi crop cultivation.

    What has the research found?

    • The research has identified regions in the northern hemisphere that receive the bulk of the rainfall during September, October and November and southern hemisphere that receive most of the rainfall from March to August.
    • The discovery that these are part of a global pattern and not one-off occurrences means they can be systematically studied, which will help understand how these communities could be affected by climate change.
    • Peninsular India and parts of South-East Asia are among the eight regions examined in the study.

    Factors affecting the retreat

    • The eight global regions identified by the study that receive most of their rainfall after summer, have several things in common.
    • They lie on the eastern fringes of landmasses and are in close proximity to mountain ranges with modest heights.

    Two predominant factors cause the phenomenon:

    • First, the low mountain range in each region runs from north to south, shielding it from west-bound winds that trigger summer monsoon.
    • After summer, the range aids in the ‘orographic lift’ or rising of east-bound air mass from a lower to higher elevation, forming clouds and resulting in rain.
    • The second factor is atmospheric convection or vertical movement of air.
    • As the earth is heated by the sun, different surfaces absorb different amounts of energy and convection may occur where the surface heats up very rapidly.
    • As the surface warms, it heats the overlying air, which gradually becomes less dense than the surrounding air and begins to rise.
    • This condition is more favorable from September to February because of the role played by sea surface temperature or water temperature.

    Answer this PYQ in the comment box:

    Q.The seasonal reversal of winds is the typical characteristic of:

    (a) Equatorial climate

    (b) Mediterranean climate

    (c) Monsoon climate

    (d) All of the above climates

  • NatGeo recognizes ‘Southern Ocean’ as globe’s fifth ocean

    The National Geographic magazine has recognized the ‘Southern Ocean’ as the world’s fifth ocean June 8, 2021 hoping others will soon follow suit.

    Answer this PYQ from CSP 2019 in the comment box:

    Q.The most important fishing grounds of the world are found in the regions where:

    (a) warm and cold atmospheric currents meet

    (b) rivers drain out large amounts of freshwater into the sea

    (c) warm and cold oceanic currents meet

    (d) continental shelf is undulating

    Southern Ocean

    • The Southern Ocean, also known as the Antarctic Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60° S latitude and encircling Antarctica.
    • As such, it is regarded as the second-smallest of the five principal oceanic divisions: smaller than the Pacific, Atlantic, and Indian oceans but larger than the Arctic Ocean.
    • Over the past 30 years, the Southern Ocean has been subject to rapid climate change, which has led to changes in the marine ecosystem.

    What has NatGeo attempted?

    • The magazine says the Southern Ocean is the only ocean ‘to touch three other oceans and to completely embrace a continent rather than being embraced by them’.
    • Its northern limit is a latitude of 60 degrees south.
    • It is also defined by its Antarctic Circumpolar Current that was formed 34 million years ago. The current flows from west to east around Antarctica.
    • The Southern Ocean is home to large populations of whales, penguins, and seals.

    Why such a move?

    • Usually, the magazine has followed the International Hydrographic Organization (IHO) on marine names, it said in an article notifying the change.
    • The IHO too had recognized ‘Southern Ocean’ as a distinct body of water surrounding Antarctica in 1937 but had repealed the same in 1953.