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    Free solutions for NCERT Solutions - Science , Class 8 Chapter 19 - Pollution of Air and Water Exercise question 29. These explanations are written by Lido teacher so that you easily understand even the most difficult concepts

    NCERT Solutions Class 8 Science Solutions for Exercise in Chapter 18 - Pollution of Air and Water

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    Prepare a brief speech on global warming. You have to deliver a speech in your class.

    Answer: ANSWER:

    The increase in the average temperature of the Earth’s surface is known as Global warming. It occurs due to the increased concentration of greenhouse gases in the atmosphere. Greenhouse gases include methane, CO2, and water vapor. These gases trap the solar radiation released back by the earth, which results in keeping our planet warm and helps in human survival. However, an increase in these gases can lead to an increase in the earth's temperature resulting in global warming.

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    Question 9 Prepare a brief speech on global warming. You have to deliver the speech in your class.

    Question 9 Prepare a brief speech on global warming. You have to deliver the speech in your class.

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    Question 9 Prepare a brief speech on global warming. You have to deliver the speech in your class.

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    Question 9

    Prepare a brief speech on global warming. You have to deliver the speech in your class.

    Open in App Solution

    Global warming is the phenomenon of a gradual increase in the temperature near the earth’s surface. This phenomenon has been observed over the past one or two centuries. This change has disturbed the climatic pattern of the earth. However, the concept of global warming is quite controversial but the scientists have provided relevant data in support of the fact that the temperature of the earth is rising constantly. There are several causes of global warming, which have a negative effect on humans, plants, and animals. These causes may be natural or might be the outcome of human activities. In order to curb the issues, it is very important to understand the negative impacts of global warming.

    Following are the major causes of global warming:

    1.Man-made Causes of Global Warming

    Deforestation

    Plants are the main source of oxygen. They take in carbon dioxide and release oxygen thereby maintaining environmental balance. Forests are being depleted for many domestic and commercial purposes. This has led to an environmental imbalance, thereby giving rise to global warming.

    Use of Vehicles

    The use of vehicles, even for a very short distance results in various gaseous emissions. Vehicles burn fossil fuels which emit a large amount of carbon dioxide and other toxins into the atmosphere resulting in a temperature increase.

    Chlorofluorocarbon

    With the excessive use of air conditioners and refrigerators, humans have been adding CFCs into the environment which affects the atmospheric ozone layer. The ozone layer protects the earth's surface from the harmful ultraviolet rays emitted by the sun. The CFCs has led to ozone layer depletion making way for the ultraviolet rays, thereby increasing the temperature of the earth.

    Industrial Development

    With the advent of industrialization, the temperature of the earth has been increasing rapidly. The harmful emissions from the factories add to the increasing temperature of the earth.

    In 2013, the Intergovernmental Panel for Climate Change reported that the increase in the global temperature between 1880 and 2012 has been 0.9 degrees Celsius. The increase is 1.1 degrees Celsius when compared to the pre-industrial mean temperature.

    Agriculture

    Various farming activities produce carbon dioxide and methane gas. These add to the greenhouse gases in the atmosphere and increase the temperature of the earth.

    Overpopulation

    An increase in population means more people breathing. This leads to an increase in the level of carbon dioxide, the primary gas causing global warming, in the atmosphere.

    2. Natural Causes of Global Warming

    Volcanoes

    Volcanoes are one of the largest natural contributors to global warming. The ash and smoke emitted during volcanic eruptions goes out into the atmosphere and affects the climate.

    Water Vapour

    Water vapor is a kind of greenhouse gas. Due to the increase in the earth’s temperature more water gets evaporated from the water bodies and stays in the atmosphere adding to global warming.

    Melting Permafrost

    Permafrost is there where glaciers are present. It is frozen soil that has environmental gases trapped in it for several years. As the permafrost melts, it releases the gases back into the atmosphere increasing the earth’s temperature.

    Forest Blazes

    Forest blazes or forest fires emit a large amount of carbon-containing smoke. These gases are released into the atmosphere and increase the earth’s temperature resulting in global warming.

    Effects of Global WarmingRise in Temperature

    Global warming has led to an incredible increase in the earth’s temperature. Since 1880, the earth’s temperature has increased by ~1 degree. This has resulted in an increase in the melting of glaciers, which has led to an increase in the sea level. This could have devastating effects on coastal regions.

    Threats to the Ecosystem

    Global warming has affected the coral reefs which can lead to a loss of plant and animal lives. An increase in global temperat.

    Climate Change

    Global warming has led to a change in climatic conditions. There are droughts at some places and floods at some. This climatic imbalance is the result of global warming.

    Spread of Diseases

    Global warming leads to a change in the patterns of heat and humidity. This has led to the movement of mosquitoes that carry and spread diseases.

    High Mortality Rates

    Due to an increase in floods, tsunamis, and other natural calamities, the average death toll usually increases. Also, such events can bring about the spread of diseases that can hamper human life.

    Loss of Natural Habitat

    A global shift in the climate leads to the loss of habitats of several plants and animals. In this case, the animals need to migrate from their natural habitat and many of them even become extinct. This is yet another major impact of global warming on biodiversity.

    Suggest Corrections 32 SIMILAR QUESTIONS

    Q.

    Prepare a brief speech on global warming. You have to deliver the speech in your class.

    Q. Your class is organizing an event, and you have decided to deliver a speech to welcome all those attending the event. Identify which option is the most suitable for the speech.

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    Prepare a Brief Speech on Global Warming. You Have to Deliver the Speech in Your Class.

    Prepare a Brief Speech on Global Warming. You Have to Deliver the Speech in Your Class.

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    Prepare a brief speech on global warming. You have to deliver the speech in your class.

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    SOLUTION

    Global warming is an increase in the average temperature of the Earth’s surface. It occurs as a result of an increased concentration of greenhouse gases in the atmosphere. The greenhouse gases include carbon dioxide, methane, and water vapour. These gases trap solar radiations released back by the Earth. This helps in keeping our planet warm and thus, helps in human survival. However, an increase in the amount of greenhouse gases can lead to an increase in the Earth’s temperature leading to global warming.

    Concept: Green House Effect

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    Chapter 18: Pollution of Air and Water - Exercises [Page 251]

    Q 9 Q 8 Q 10

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    NCERT Class 8 Science

    Chapter 18 Pollution of Air and Water

    Exercises | Q 9 | Page 251

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