Global Warming

Name: Liang WeiMajor: Electric Machinery and

Electric Equipment

Main Content Main Content

• The earth is warming

• The cause of global warming

• The consequence of global warming

• Action

The earth is warmingThe earth is warming

Global Warming: Global warming is the increase in the average temperature of the earth’s near-surface air and oceans in recent decades and its protected continuation.

What is global warming and how it works?

What is global warming and how it works?

Proofs of Global WarmingProofs of Global Warming• the accelerating melt of polar ice, glaciers

( 冰河 )and snow. This is the most obvious evidence of global

warming.• Rising sea level The warmer temperatures have raised sea

level by expanding ocean water, melting mountain glaciers.Globally, sea level has risen approximately 15-20 cm over the past century.

During the entire 20th century, the average global temperature increased by 0.6 degrees Celsius. Using computer climate models, scientists estimate that global by the year 2100 the average global temperature will increase by 1.4 degrees to 5.8 degrees Celsius.

The cause of global warmingThe cause of global warming

Global warming is associated with greenhouse effect closely.

Greenhouse effect is a natural phenomena .greenhouse effect often gets a bad name because of its association with global warming,but the truth is we couldn’t live without it.

What is greenhouse effect?What is greenhouse effect?

Greenhouse gases especially carbon dioxide in the atmosphere can warm the earth by trapping heat energy.

The greenhouse effect is a natural phenomenon ， which is important. Without the greenhouse effect, the Earth would not be warm enough for humans to live.

Enhanced greenhouse effectEnhanced greenhouse effect

When human activities distort and accelerate the natural process by creating more greenhouse gases , the atmospheric concentration of greenhouse gases increases, if there is too much of greenhouse gases in the atmosphere ,the greenhouse effect would become stronger, which is called “enhanced greenhouse effect”. And with greenhouse effect being enhanced, the earth would be warmer than usual.

Carbob dioxide are the biggest problem

Carbob dioxide are the biggest problem

contribution to global warming by greenhousegases from human activities

50%

20%

16%

8% 6% Carbon DioxideCFCsMethaneOzoneNitrouse Oxide

Worldwide Carbon EmissionsWorldwide Carbon EmissionsC

arb

on

(10

9 m

etri

c to

ns)

0

1

2

3

4

5

6

7

8

1750 1800 1850 1900 1950 2000Year

Liquid fuelLiquid fuelTotalTotal

Gas fuelGas fuelSolid fuelSolid fuel

If emission of carbon dioxide continue to grow at current rate ,then the level of the gas in the atmosphere will likely double,or possibly triple,from pre-industrial levels during the 21st century.

2. How do humans contribute to the effect of

global warming ？

2. How do humans contribute to the effect of

global warming ？

Burning natural gas, coal, and oilDeforestationMany factories produce long-lasting industrial gasesPopulation growth

Burning fossil fuelBurning fossil fuel

Carbon Dioxide (CO2)

Fossil fuels (coal, oil, natural gas)

Burning fossil fuels releases the carbon dioxide stored millions of years ago. Most of the increased carbon dioxide comes from fossil fuels

DeforestationDeforestation

Deforestation releases the carbon stored in trees. Less trees also means less carbon dioxide can be removed from the atmosphere

Industries emissions

Many factories produce long-lasting industrialgases that do not occur naturally, yet contribute Significantly to the enhanced greenhouse effectAnd global warming that is currently under way.

Population GrowthPopulation GrowthPopulation growth is another factor in global warming, because as more people use fossil fuels for heat, transportation and manufacturing the level of greenhouse gases continues to increase. As more farming occurs to feed millions of new people, more greenhouse gases enter the atmosphere.

3. Impact of global warming.3. Impact of global warming.

• Glacier thaw and rising sea level

• More frequent happens of natural disasters

• Affecting human beings

Glacier thawGlacier thaw

Argentina

Wildlife EffectsWildlife Effects

• Polar Bears Require pack ice to live Might eventually go extinct in the wild

• Sea turtles Breed on the same islands as

their birth Could go extinct on some islands

as beaches are flooded

• Other species may go extinct as rainfall patterns change throughout the world

• Polar Bears Require pack ice to live Might eventually go extinct in the wild

• Sea turtles Breed on the same islands as

their birth Could go extinct on some islands

as beaches are flooded

• Other species may go extinct as rainfall patterns change throughout the world

• Global warming is a danger to a human's health. Its affect on climate can adversely affect humans.

• Plagues have been attributed to global warming. An increase in temperature can result in a longer life cycle for diseases.

• Global warming can affect our future ability to obtain food. As climates change, plants and animals will change, leading to a change in the eating patterns of humans.

Effect on HumansEffect on Humans

Wildlife EffectsWildlife Effects

• Polar Bears Require pack ice to live Might eventually go extinct in the wild

• Sea turtles Breed on the same islands as

their birth Could go extinct on some islands

as beaches are flooded

• Other species may go extinct as rainfall patterns change throughout the world

• Polar Bears Require pack ice to live Might eventually go extinct in the wild

• Sea turtles Breed on the same islands as

their birth Could go extinct on some islands

as beaches are flooded

• Other species may go extinct as rainfall patterns change throughout the world

So cute Polar Bears , however, the greenhouse effect will be ... ...

So cute Polar Bears , however, the greenhouse effect will be ... ...

They tremble with fear to guard their home ... ...

They tremble with fear to guard their home ... ...

Effects on sea level---Higher sea level

Effects on sea level---Higher sea level

Global warming may make the sea level become higher. Warmer weather makes glaciers melt. Some melting glaciers add more water to the ocean. Warmer temperatures also make water expand. When water expands in the ocean, it takes up more space and the level of the sea rises.

A 2℃ increase in earth's average temperature is expected to raise the sea level by about 50 cm. Sea level is rising more rapidly , and will probably continue to rise for several centuries.

More frequent happens of natural disastersMore frequent happens of natural disasters

Frequent natural disasters such as: tropical storms, hurricanes,drought,floot.

Effect on human beingsEffect on human beings

• Some disease would become more widespread.

• Global warming will seriously affect agriculture.

So romantic penuins, but the greenhouse effect will make them ... ...

So romantic penuins, but the greenhouse effect will make them ... ...

actionaction

Global warming is a global problem requiring action from the entire international community. Countries from around the world are working together to share technologies, experiences, resources and talent to lower net greenhouse gas emissions and reduce the threat of global climate change.

International effortInternational effortCommon responsible 责任共担 UNCCC

The United Nations Climate Change conference 哥本哈根气候峰会 2009 年 12 月 7 日— 18 日

The earth can meet humanity’s needs ,but cannot satisfy humanity’s greedy.

Thanks for watching~~!!Thanks for watching~~!!