global warming & its effects in global perspective

8/9/2019 Global Warming & Its Effects In Global Perspective

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GLOBAL WARMING AND ITS

EFFECT IN GLOBALPERSPECTIVE

Pollution, Analysis & Control.

KHALIL RAZA BHATTI

07ME40


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Global Acceptance of GW

It took more than 20 years to broadly accept that mankind is causing global

warming with the emission of greenhouse gases. The drastic increase in

the emission of CO2 (carbon dioxide) within the last 30 years caused by

burning fossil fuels has been identified as the major reason for the change

of temperature in the atmosphere


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Global Warming

Global Warming, increase in the average temperature of the atmosphere,

oceans, and landmasses of Earth. The planet has warmed (and cooled)

many times during the 4.65 billion years of its history. At present Earth

appears to be facing a rapid warming, which most scientists believe results,

at least in part, from human activities.


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THE GREEN HOUSE EFFECT

The energy that lights and warms Earth comes from

the Sun. Most of the energy that floods onto our planet

is short-wave radiation, including visible light. When

this energy strikes the surface of Earth, the energychanges from light to heat and warms Earth. Earths

surface, in turn, releases some of this heat as long-

wave infrared radiation.


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TYPES OF GREENHOUSE

GASES Greenhouse gases occur naturally in the environment and also

result from human activities. By far the most abundant greenhouse

gas is water vapor, which reaches the atmosphere through

evaporation from oceans, lakes, and rivers.


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Carbon Footprint

The total amount of greenhouse gases

produced to directly and indirectly support

human activities, usually expressed in

equivalent tons of carbon dioxide (CO2).

In other words: When you drive a car, the

engine burns fuel which creates a certain

amount of CO2, depending on its fuel

consumption and the driving distance. (CO2 is

the chemical symbol for carbon dioxide).

When you heat your house with oil, gas or

coal, then you also generate CO2


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MEASURING GLOBAL

WARMING

As early as 1896 scientists suggested that burning fossil fuels might change thecomposition of the atmosphere and that an increase in global averagetemperature might result. The first part of this hypothesis was confirmed in 1957,when researchers working in the global research program called theInternational Geophysical Year sampled the atmosphere from the top of theHawaiian volcano Mauna Loa. Their instruments indicated that carbon dioxideconcentration was indeed rising. Since then, the composition of the atmospherehas been carefully tracked. The data collected show undeniably that the

concentrations of greenhouse gases in the atmosphere are increasing.


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EFFECTS OF GLOBAL

WARMING

Scientists use elaborate computer models of temperature,

precipitation patterns, and atmosphere circulation to study

global warming. Based on these models, scientists have made

several predictions about how global warming will affect

weather, sea levels, coastlines, agriculture, wildlife, and human


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Effects of GW

Weather

Sea Levels

Agriculture

Animals and Plants

Human Health

DEBATES OVER GLOBAL WARMING


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EFFORTS TO CONTROL GLOBAL

WARMING

The total consumption of fossil fuels is

increasing by about 1 percent per year. Nosteps currently being taken or under serious

discussion will likely prevent global warming in

the near future. The challenge today is

managing the probable effects while takingsteps to prevent detrimental climate changes

in the future.


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Hard Facts About Pollution

5000 people a day die because of dirty water

1 billion people have no access to water

Nearly 1 billion going Hungary

Over 50 % of grain traded around the world is

used for animal feed or bio fuels 40 % of arable land has suffered long term

damage

Every year 13 millions hectares of forest

disappear


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Cont.

One mammal in 4, one bird in 3 and one

amphibian in 3 are threatened with extinction.

Species are dying out at a rhythm 1000 times

faster than the natural rate.

Three quarters of fishing grounds are

exhausted in dangerous decline

The average temperature of the last 15 yearshave been the highest ever recorded.

The ice cap is 40% thinner than 40 years ago


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global warming & its effects in global perspective

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