global war ming
TRANSCRIPT
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Presented by: Abdul Wajid
Course: EVSDept: BBA
Global Warming
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Contents
qIntroductionIntroduction
qCausesCauses
qProblemsProblems
qSolutionsSolutions
qMy opinionMy opinion
qQuestionQuestion
session.session.
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Global warming is anincrease in the averagetemperature of Earth'ssurface. Since the late
1800's, the global averagetemperature has increasedabout 0.7 to 1.4 degrees F(0.4 to 0.8 degrees C). Many
experts estimate that theaverage temperature will risean additional 2.5 to 10.4degrees F (1.4 to 5.8 degreesC) by 2100. That rate of
increase would be much
Global Warming
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Causes of global warming
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POPULATIONPOPULATION
INCREASEINCREASE
DEFORESTATIOEFORESTATION
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Portage Glacier
Alaska
1914 2004
: – .hotos NOAA Photo Collection and Gary Braasch WorldViewOfGlobalWarming org
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Colorado River
Arizona
une 2002 ec 2003
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How Global Warming Works
Fossil fuels (coal, oil, natural
gas)
arbon Dioxide
(CO2)
reenhouse gases
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Problems: Harm to ocean life
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Changes of habitat
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Weather damage
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The Sun’s energy
passes through the
car’s windshield.
This energy (heat)
is trapped inside
the car and cannot
pass back throughthe windshield,
causing the inside
of the car to warm
up.
Example Example of the
Greenhouse Effect
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CO2 ollution and G lo b a l Warming n d i n g t he s ou rc e o f i n c r ea se d C O 2 n t he at m os p he r
Some scientists have suggested that when the earth was new (about4.5 billion years ago), CO2 may have made up as much as 80% of the
earth's atmosphere. About 2 billion years ago, the concentration of CO2
was likely 20 or 30%. Human life and even most life could not havesurvived in such an atmosphere. With the evolution of photosynthesizing plants, the concentration of CO2 dropped and the
percentage of oxygen in the atmosphere increased.
Remember that in photosynthesis:Remember that in photosynthesis:
COCO22 +H2O + energy from sun ==> O2 + sugar +H2O + energy from sun ==> O2 + sugar
Both plants and animals undergo respiration in whichBoth plants and animals undergo respiration in whichSugar + O2 ==> COSugar + O2 ==> CO
22 +H20 + energy+H20 + energy
In addition, when plants and animals die, the dead organisms decayand give off CO2.
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Solutions
Simple solution
×Reduce greenhouse gases emission
Stop dependency on fossil fuels
×Renewable energy
→Solar energy, wind energy andbiomass energy
Green areas×Plant more trees
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In d iv id u a l
so lu tio n s
Spread awareness urn off your computer or urn off your computer or
’he TV when you re not’he TV when you re not
.sing it.sing it
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Plant more trees
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CONSUME MUCH MORE
ON… Solar Power Wind Power
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And also don’t forget fuelefficient cars…
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2007
Reduction
in CO2 er Year
Produceelectricity efficientlyUse electricity
efficientlyVehicleefficiencySolar andWind PowerBiofuels
Carboncapture andstorage
Our Goal
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Save EARTH before its tooSave EARTH before its toolate…late…