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    What is global warming?

    Global warming is when the earth heats up (the temperature rises). It happens when

    greenhouse gases (carbon dioxide, water vapor, nitrous oxide, and methane) trap heat and

    light from the sun in the earths atmosphere, which increases the temperature. This hurts

    many people, animals, and plants. Many cannot take the change, so they die.

    Air Pollution

    You need to breathe to stay alive. But how clean is the air you breathe? If you breathe

    dirty air, you are more likely to develop health problems and become ill. Plants and

    animals need clean air too. A lot of the things that make our lives more comfortable such

    as cars, electricity and heating, create bad gases which make the air dirty. The problem of

    air pollution started with the burning of coal in homes and factories. Dirty air is called

    'polluted air'.

    'Air pollution' is what we say to describe all bad gases in the air that we breathe and that

    are dangerous for us.

    Water Pollution

    Water pollution can be defined in many ways. Usually, it means one or more substances

    have built up in water to such an extent that they cause problems for animals or people.

    Oceans, lakes, rivers, and other inland waters can naturally clean up a certain amount of

    pollution by dispersing it harmlessly. If you poured a cup of black ink into a river, the inkwould quickly disappear into the river's much larger volume of clean water. The ink

    would still be there in the river, but in such a low concentration that you would not be

    able to see it. At such low levels, the chemicals in the ink probably would not present any

    real problem. However, if you poured gallons of ink into a river every few seconds

    through a pipe, the river would quickly turn black. The chemicals in the ink could very

    quickly have an effect on the quality of the water. This, in turn, could affect the health of

    all the plants, animals, and humans whose lives depend on the river.

    Noise Pollution

    Noise pollution (or environmental noise) is displeasing human, animal or machine-

    created sound that disrupts the activity or balance of human or animal life. The word

    noise comes from the Latin word nauseas meaning seasickness.

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    The source of most outdoor noise worldwide is mainly construction and transportation

    systems, including motor vehicle noise, aircraft noise and rail noise. Poor urban planning

    may give rise to noise pollution, since side-by-side industrial and residential buildings

    can result in noise pollution in the residential area.

    Indoor and outdoor noise pollution sources include car alarms, emergency service sirens,

    mechanical equipment, fireworks, compressed air horns, groundskeeping equipment,

    barking dogs, appliances, lighting hum, audio entertainment systems, electric

    megaphones, and loud people.

    Natural Disasters

    Natural disasters are extreme, sudden events caused by environmental factors that injure

    people and damage property. Earthquakes, windstorms, floods, and disease all strike

    anywhere on earth, often without warning. As examples, we've chosen disasters that have

    occurred around the world throughout history.

    Avalanches

    Blizzards and Hailstorms

    Droughts and Famines

    2011: Japan Tsunami

    Tsunamis

    Earthquakes

    Floods

    Volcanic Eruptions

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