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8/7/2019 APARNA.g;o
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BY
T.N.APARNA
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GLOBAL WARMING
y Global warming relates to increase in average temperature
of Earths surface.
y It is caused by green house gases.y They leads to green house effect.
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GREEN HOUSE EFFECTy Process of obsorption and emission of IR radiation by
gases.
y
Gases Warms planets surface and atmosphere.y Have mean warming effect of 33 degrees centigrade.
y Water vapour-causes 36-70% of effect.
y Carbon di oxide-causes 9-26% of effect.
yMethane-4-9% of effect.
y Ozone 3-7% of effect
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CAUSES OF GLOBAL WARMINGy Global warming is caused by several things.
y They are mainly divided into two types.
1.Natural causes
2.Man made causes
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NATURAL CAUSESy Causes that are created by nature.
y Release of methane from arctic tundra, wetlands.
y Earth goes through cycle of climatic changes.
y These changes lasts about 40,000 yeares.
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MAN MADE CAUSESy Pollution is major man made problem.
y It is due to release of green house gaeses.
y They are Methane, Nitrous oxide,corbon di oxide etc.CARBON DI OXIDE:
y Major source is power plants.
y Emits by burning fossil fuels for electricity.
y 20% by gasolin in engine of vehicles.
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METHANE:
y 20 times effectual to co2 in trapping heat.
yResources are like paddy,rice,bacteria etc.
y When fields flooded anaerobic situations occurs releasingmethane.
NITROUS OXIDE:
ySource is Nylon,Nitric acid production.
y Cars with catalytic converters.
y Burning of organic matter.
DEFORESTRATION
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Some other gases causing pollution are:
y VOCs let into air by burning fuels.
y Carbon monoxide-burning source of energy.y PM-10-Source isplowing and burning fields.
y Sulphur dioxide-making papers,metals.
y Lead-source ispaint,laededgasoline,batteries.
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EFFECTS OF GLOBAL WARMINGy Increase in average earths tenperature.
y Melting of ice caps in polar regions.
y Leads to raise in sea levels.y Threat to low lying is lands,costal regions.
y Rain fall patterns changes leads to floods,famines.
y Ozone layer depletion.
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EFFECTS ON PLANTS AND ANIMALS
y Higher or lower agricultural productivity.
y Global warming leads to genus extinction.
y Increase in disease causing vectors.y Fast growing of disease causing bacteria.
y Leads to diseases like Ebola,hants.
y Golden toad,Harlequin frog of costrica already extinct.
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GLOBAL WARMING STATISTICSy According to NASA hottest ywar was 2005.
y 100 billion$ damage caused by hurricanes hitting us coast
in 2005.y Above is according to National Climate Data Center.
y 15-37% of plants and animals wiped out by 2050.
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FUTURE PREDICTIONSy Global mean temperature raise between 1.4and 5.8
degrees centigrade.
y Sea level raises between 9and 88cm.yNortherh hemisphere cover decreases further.
y US ranks 1 among nations global warming polluter.
y Antarctic ice sheet should increase.
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PRECAUTIONS TO PREVENT
GLOBAL WARMING
y Useless usage of ac,refrigerator should stopped.
y Releases CFC leading to ozone layer depletion.
y Hydrogen operated vehicles should be used.y More trees should be planted.
y Chimneys in industries be upgraded.
y Government made THE CLEAN AIR ACT to less
pollution.
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THANK YOU
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