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What is Global Warming?

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Since the beginning of time, the Earth has been warmed by sunlight beaming down ... and severe weather events, including hurricanes, tornadoes, extreme heat waves, ... – PowerPoint PPT presentation

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Title: What is Global Warming?


1
What is Global Warming?
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3
Global Warming
  • Since the beginning of time, the Earth has been
    warmed by sunlight beaming down through the
    insulating blanket of the atmosphere. That
    blanket, made up of carbon dioxide, water vapor,
    ozone, methane and nitrous oxide, traps heat on
    the Earth from the sun's energy, creating what is
    called the Greenhouse Effect. This process
    regulates the Earth's climate, keeping it stable
    enough to sustain life. Without it, the Earth
    would be too cold to live on.

4

Global Warming
  • But since the Industrial Revolution, the burning
    of fossil fuels has increased emissions of
    greenhouse gases. Carbon dioxide and other gases,
    including methane, nitrous oxide and
    chlorofluorocarbons have now formed a blanket
    around the earth. As each year goes by, these
    gases trap more and more heat that would
    otherwise escape into space. The heat rebounds
    onto the Earth's surface, and the planet's
    temperature rises. This human-induced increase in
    greenhouse gases is called the Enhanced
    Greenhouse Effect.

5
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Global Warming
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9
Global Warming
  • Carbon dioxide takes about 100 years to
    decompose, which means that CO2 that was emitted
    in 1920 from the burning of fossil fuels is still
    in the atmosphere today. Experts predict that by
    the year 2100, carbon dioxide's heat-trapping
    properties will have increased global
    temperatures by anywhere from two to six degrees,
    and global sea levels are expected to rise by a
    further six to 37 inches, because sea water
    expands when heated and some glacial ice will
    melt.

10
Global Warming
  • the rise of global sea levels, drowning
    population-dense coastal cities and low-lying
    nations, including Bangladesh and many Pacific
    Islands
  • the spread of infectious tropical diseases to
    more temperate parts of the world
  • a reduction in food-producing regions and
  • an upsurge in violent and severe weather events,
    including hurricanes, tornadoes, extreme heat
    waves, floods and drought

11
  • What You Can Do
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