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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