Transcript maciiii and jessicaaaa

Global Warming and Green
House effect.
By. Maci, Jessica
Definitions
• Global Warming- an increase in the earth’s
average atmospheric temperature that
causes corresponding changes in climate
and that may result from the greenhouse
effect.
• Greenhouse effect- natural heating caused
by atmospheric gases trapping heat at
Earth’s surface.
Global Warming
• Climate change is among the most pervasive
threats to the Earth today. We have the power to
address its root causes and limit its impact on
the planet.
• Climate change, more commonly known as
global warming, is caused by the emission of
heat trapping gases produced by vehicles,
power plants, industrial processes and
deforestation. As these gases build up, they act
like a big blanket, over-heating the planet and
threatening our health, our economy and our
environment.
Green House Effect
• The green house effect is natural heating
caused by gases in our atmosphere, trapping
heat.
• The greenhouse effect refers to circumstances
where the short wavelengths of visible light from
the sun pass through a transparent medium and
are absorbed, but the longer wavelengths of the
infrared re-radiation from the heated objects are
unable to pass through that medium. The
trapping of the long wavelength radiation leads
to more heating and a higher resultant
temperature.
Causes of Global Warming
• Almost 100% of the observed temperature
increase over the last 50 years has been due
to the increase in the atmosphere of
greenhouse gas concentrations like water
vapor, carbon dioxide (CO2), methane and
ozone. Greenhouse gases are those gases
that contribute to the greenhouse effect. The
largest contributing source of greenhouse
gas is the burning of fossil fuels leading to
the emission of carbon dioxide.
Cause
• There are some natural greenhouse gases: water
vapor, nitrous oxide, carbon dioxide, methane and
ozone. However, over the past fifty years, production
of carbon dioxide, nitrous oxide and methane has
risen sharply, and a new type of chemical - the
chlorofluorocarbon, or CFC - has been introduced as
a refrigerant, solvent and aerosol propellant, but it is
also a very powerful greenhouse gas, because it can
trap a lot of radiation - one molecule of CFC is 12,000
to 16,000 times as effective at absorbing infra-red
radiation as a molecule of carbon dioxide
Consequences, Effects
-global warming
The Earth's natural laws and
boundaries have been
affected by the ever-growing
human
population, and every so of
ten the planet's
natural reaction
sends signals
of stress
and/or recovery.
•
As it is obvious by its name, Global Warming is a global phenomenon with
a number of effects on the global level. Global warming has various
effects, ranging from the effects to the atmosphere to the economical,
environmental as well as the health life of human beings.
Greenhouse Effect
Consequences, Effects
- Green house effect
• Increase of greenhouse gases concentration causes a
reduction in outgoing infrared radiation, thus the Earth's
climate must change somehow to restore the balance
between incoming and outgoing radiation. This ¡§climatic
change. ”i will include a is global warming” of the Earth's
surface and the lower atmosphere as warming up is the
simplest way for the climate to get rid of the extra energy.
However, a small rise in temperature will induce many
other changes, for example, cloud cover and wind
patterns. Some of these changes may act to enhance
the warming (positive feedbacks), others to counteract it
Bibliography
• http://www.nature.org/initiatives/climatechange/a
bout/
• http://www.ask.com/?o=0&l=dir
• http://dictionary.reference.com/browse/global%2
0warming
• http://www.solcomhouse.com/Greenhouect.gif
• http://hyperphysics.phyastr.gsu.edu/hbase/thermo/grnhse.html
• http://environment.about.com/z/js/o.htm
• http://www.hko.gov.hk/wxinfo/climat/green
hs/e_grnhse.htm