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GLOBAL WARMING

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Title: GLOBAL WARMING Author: Gloria Last modified by: Gloria Created Date: 11/13/2007 10:21:39 PM Document presentation format: Presentaci n en pantalla – PowerPoint PPT presentation

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Title: GLOBAL WARMING


1
GLOBAL WARMING
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What is Global Warming?
  • Is a phenomenon that has been happening for a
    long time. The temperature of the earth has been
    increasing more or less continuously since the
    time of the cave man.
  • Approximately 18,000 years ago the earth began a
    gradual process of warming up after more than
    100,000 years of Ice Ages. Much of North America,
    Europe, and Asia lay buried beneath great sheets
    of glacial ice.

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What Causes Global Warming?
  • Scientists have determined that a number of
    human activities are contributing to global
    warming by adding excessive amounts of greenhouse
    gases to the atmosphere. Greenhouse gases such as
    carbon dioxide accummulate in the atmosphere and
    trap heat that normally would exit into outer
    space.

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The Green House Effect
  • The "greenhouse effect" helps to moderate
    temperatures -- especially nighttime
    temperatures. Without the greenhouse effect, the
    average temperature of the Earth would be -18
    degrees C.
  • Greenhouse gases allow sunlight to pass through
    Earth's atmosphere, but as sunlight strikes the
    earth it is partially changed to radiant heat.
    Greenhouse gases like carbon dioxide, water
    vapor, and methane help inhibit the escape of
    radiant heat back into space

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Effects of Global Warming
  • Glacier retreat and disappearance

Greenland's glaciers are melting even faster than
previously thought and contributing more and more
to sea level rise caused by global warming. If
you live near the sea and think global warming
isn't a problem for you, it's probably time to
think again. The latest reports on increased
levels of glacial discharge, in the journal
Science, reports the amount of ice being dumped
into the ocean from the Greenland Ice Sheet has
doubled in the last 5 years. A full breakdown
would result in a catastrophic global sea level
rise of 7 meters. That's bye-bye most of
Bangladesh, Netherlands, Florida and would make
London the new Atlantis
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Destabilization of climates
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Sea Level Rise
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Forest Fires
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Effects on Agriculture
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How to Prevent Global Warming
  • Cutting down carbon emissions
  • Unplug Unused Electronics
  • Turn off lights
  • Recycle more
  • Reduce the use of air-conditioners
  • Preffer to walk
  • Plant a Tree

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  • THANK YOU ALL
  • FOR YOUR ATTENTION
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