Global warming 101

Duration: 3 minutes and 3 seconds

Country: United States

Language: English

License: CC - Attribution Non-commercial No Derivatives

Genre: None

Views: 430 (15 embedded)

Posted by: totleigh on Oct 31, 2009

brief description of global warming, causes, effects and solutions

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For 2.5 million years
the Earth's climate has fluctuated
cycling from ice ages to warmer periods.
But in the last century the planet's temperature has risen unusually fast
about 1.2 to 1.4 degrees Fahrenheit
Scientists believe it's human activity
that's driving the temperatures up
a process known as 'global warming'.
Ever since the industrial revolution began
factories, power plants and eventually cars have burned
fossile fuels such as oil and coal
releasing huge amounts of carbon dioxide
and other gases into the atmosphere.
These greenhouse gases trap heat near the Earth
through a naturally ocurring process
called 'The greenhouse effect'
The Greenhouse effect begins with the sun
and the energy it radiates to the Earth
The Earth and the atmosphere absorb some of this energy
while the rest is radiated back into space
Naturally occurring gases in the atmosphere
trap some of this energy
and reflect it back
warming the Earth
Scientists now believe
that the greenhouse effect is being intensified
by the extra greenhouse gases that humans have released
Evidence for global warming includes
a recent strain of very warm years
Scientists record that 1998
was the warmest year in measured history
with 2005 coming in second
Meanwhile, readings taken from ice core show
that the greenhouse gases, carbon dioxide and methane
have hit their highest levels in the past 420,000 years.
Arctic sea ice is also shrinking
According to NASA studies,
the extent of Artic sea ice has declined
about 10 %
in the last thirty years
As long as industrialized nations
consume energy
and developing countries increase
their fossile fuel consumption
the concentration of greenhouse gases in the atmosphere
will continue to rise
Researchers predict
that temperatures will increase about 2 to 10 degrees Fahrenheit
by the end of the century
what’s lesser in
what rising temperatures mean for the planet
Some climate models predict
subtle changes
Others forecast rising sea levels
which could flood coastal areas around the world.
Weather patterns could change
making hurricanes more frequent
Severe droughts could become more common in warm areas
and species unable to adapt to the changing conditions
would face extinction
Although much remains to be learned about global warming
many organizations advocate cutting greenhouse gas emissions
to reduce the impact of global warming
Consumers can help
by saving energy around the house
switching to compact fluorescent light bulbs
and driving fewer miles in the car each week
These simple changes may help
keep the Earth cooler in the future

Global warming 101

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