presentation on global warming

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Group Members: Md. Mahfuzur Rahman Md. Shamim Ahmmed Md. Forhad Hossain Md. Jasim Uddin Md. Tarikul Islam 1

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Page 1: Presentation on global warming

Group Members:Md. Mahfuzur Rahman

Md. Shamim Ahmmed

Md. Forhad Hossain

Md. Jasim Uddin

Md. Tarikul Islam

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Page 2: Presentation on global warming

Greenhouse effect, Global

warming and Climate change

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Page 3: Presentation on global warming

Definition of Greenhouse effect,

Global warming and Climate change

Causes

Effects

Probable solutions

Conclusion

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Page 4: Presentation on global warming

The aim of our presentation is to let you inform about the

Greenhouse effect, global warming and climate change which

are the burning questions in recent time and the objective is the

possible solutions that means how we can make our

environment sustainable.

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Page 5: Presentation on global warming

The terms “Greenhouse Effect”, “Climate Change”, and “Global

Warming” are often used interchangeably, yet they really refer to

three separate processes. In this section, we‟ll examine all three

and evaluates whether the earth‟s atmosphere is getting warmer.

The threat of global climate change has produced one of today‟s

most intractable policy issues. This is because the emissions of

gases with our everyday lifestyle. Global average surface

temperature has increased over 20th century by about 0.60C;

globally, it is very likely that the 1990s was the warmest decade

and 1998 the warmest year in the instrumental record since 1861.

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Page 6: Presentation on global warming

GREENHOUSE EFFECT

The greenhouse effect is natural phenomenon. Approximately70% of the sunlight failing on earth is absorbed and re-radiatedas longer length, infrared energy (i.e. heat). Water vapor andatmospheric gases, including trace gases such as carbondioxide (CO2), absorb some of the outgoing infrared radiation,warming the air. This „greenhouse effect‟ raises thetemperature of earth to an average of around 150C. However,with the burning of fossil fuels since the industrial revolution,the atmospheric concentration of these greenhouse gases hasincreased. This alters the radiation balance so that longer waveradiation is being observed in the lower atmosphere and someof this is being re-emitted back to the earth‟s surface. This isknown as the‟ Greenhouse Effect.‟

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Page 7: Presentation on global warming

Figure: Atmospheric radiation 7

Page 8: Presentation on global warming

GLOBAL WARMING

Slowly, the ability of the earth‟s atmosphere to absorb heat

from the surface has increased and, with it, the temperature of

the atmosphere. This is known as global warming. Global

warming is caused by an increase in the greenhouse effect. The

greenhouse effect is not a bad thing by itself -- it's what allows

Earth to stay warm enough for life to survive.

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Page 9: Presentation on global warming

Figure: Annual Global Warming

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Page 10: Presentation on global warming

CLIMATE CHANGE

Climate change is also known to refer to the significant

changes in measures of climate. The changes pertain to the

issue of temperature, precipitation, or wind. Both of the things

have a lasting effect on the nature. As for the climate change,

this usually results from the counter play of many natural

factors.

.

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In crease in the amount of greenhouse gasses in the atmosphere attributed mainly to human activity. There some causes of greenhouse effect:

Burning fossil fuels

Cutting down trees

Burning forest

Factories pollution

Coal

Oil

Natural Gases

Rising Sea levels

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Page 13: Presentation on global warming

Fig. 2: Yearly CO2 Observations (IPCC)13

Page 14: Presentation on global warming

Global warming is a result of increasing temperature of earth's

atmosphere due to several factors that can be natural or man

made. Whatever may be the factors the effect of global

warming is not in favor of mankind and hence need to be

controlled.

The main reason behind global warming is the increase in the

concentration of greenhouse gases in the atmosphere due to

green house effect.

Another important reason for global warming is large amounts

of carbon dioxide produced from burning of fossil fuels for the

different purposes especially for power generation in various

power plants.

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Page 15: Presentation on global warming

Methane is another green house gas that results in global

warming to a large extent.

Another major cause of global warming is continuous cutting

of a large number of trees across the world that is also referred

as deforestation.

Increasing population is another cause of global warming that

cannot be neglected.

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Page 16: Presentation on global warming

Human Causes

Increase green house gasses(emulsion from burning fossils

fuels-oil, coal etc)

Pollution, smog from factories.

Deforestation

Increasing Population (More people more CO2)

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Page 17: Presentation on global warming

Natural Causes

The arctic tundra and wetlands release methane, a greenhouse

gas

Earth naturally has a cycle of climate change that occurs every

40,000 years

The sun‟s solar energy output is changing and naturally increases

Earth average temperature by about 1‟C every century

Earth‟s orbit and tilt alter in relation to the sun, which changes

solar energy output.

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Page 18: Presentation on global warming

Rising concentration of greenhouse gases generally produce an

increase in the average temperature of the Earth

Rising temperature may , in turn , produce changes in weather,

sea levels and land use patterns, commonly referred to as

“climate Change”

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Page 19: Presentation on global warming

An average increase in temperature and during the last century

Melting of polar ice-polar bears and others animals are

drowning

Migrating birds are forced to change their time and place of

migration

Melting of glaciers will lead to higher sea level, which will

cause floods and put many low elevation regions at risk of

disappearing under water

Longer summers can disrupt animal habitation

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Page 20: Presentation on global warming

New and widespread diseases because of warm climate

Damaged crops due to sudden climate change and floods

Average Precipitation increase around the world

More wildfires

Droughts, heat waves, extreme winter and storms, hurricanes,

typhoons

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Personal choices matter

calculate your carbon foot print

reduce it relatively and tell the stories

Practice choices matter

“Green” your office and institution

Educate and innovate

Political choices matter

Make change locally

Educate decision makers

Participate fully in the local political process

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Page 23: Presentation on global warming

Replace biomass with clean renewable energy and develop

“smart” local electrical grids

Reduces emissions and prevents new emissions, prevents

cardiopulmonary diseases and death, gets necessary energy to

households

Improve public transport, create bike lanes

Reduces need for personal vehicle, decreases congestion,

noise, and air pollution, promotes active transport

Promote solar hot-water and water conservation

Reduces air pollution, promotes health, saves money

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Page 24: Presentation on global warming

Low NOX burners should be planted.

Low CO2 Emission engine and production plant should be

introduced.

Pre-combustion control and Post-combustion control

should be maintained in automobile design and industrial

machineries.( SO2 removal)

Waste water treatment plant.

Using ecological insulation materials for cooling.

Dumping or recycling the solid waste of energy producing

plant.

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NRDC 25

Page 26: Presentation on global warming

The IPCC Third Assessment Report on the Scientific Basis ofClimate Change provides a comprehensive and up-to-dateoverview of what is currently known, and not known, aboutthe science of climate change and what needs to be done toincrease understanding in the present areas of uncertainty.While concluding that „…most of the observed warming overthe last 50 years is likely to have been due to the increase ingreenhouse gas concentrations‟ and indicating that, for the fullangel of plausible non-intervention emission scenariosconsidered, „global average temperatures and sea levels areexpected to rise‟ throughout the twenty-first century andbeyond, the Report also draws attention to many gaps ininformation and many uncertainties remaining in theunderlying science.

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