greenhouse effect, natural and enhanced
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Greenhouse Effect, Natural and Enhanced. November 19, 2008. Survey. Have you ever seen a greenhouse? What is its roof made of? Which is hotter, the inside of a greenhouse or the outside? What’s the average temperature of the earth? What prevents the earth from getting too hot or too cold?. - PowerPoint PPT PresentationTRANSCRIPT
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Greenhouse Effect, Greenhouse Effect, Natural and EnhancedNatural and Enhanced
November 19, 2008November 19, 2008
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SurveySurvey
Have you ever seen a greenhouse? What is its roof made of?
Which is hotter, the inside of a greenhouse or the outside?
What’s the average temperature of the earth?
What prevents the earth from getting too hot or too cold?
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I. Greenhouse effectI. Greenhouse effect Explain the basic theory of the greenhouse
effect with the help of the given words below.
heat energy, pass through, glass, heat the ground;
part of the energy, reflect, atmosphere, some, trapped inside;
inside, greenhouse, warmer
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The heat energy from the sun passes through the glass and heats the ground.
The heat energy from the ground is partly reflected into the atmosphere, but some is trapped inside the greenhouse.
Therefore, the inside of the greenhouse is getting warmer and warmer. This is the greenhouse effect.
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II. Natural greenhouse effect on II. Natural greenhouse effect on the earth the earth
Find similarities between a greenhouse and the earth.
Greenhouse Earth
heat source
the sun
trap glass ceiling
result 1 heat trapped
result 2 getting warmer
the sunthe sun
greenhouse gas greenhouse gas layerlayerheat heat trappedtrappedgetting getting warmerwarmer
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heat energy, pass through, greenhouse gas layer, heat the earth
part of the energy, reflect, space, some, trapped in the atmosphere
earth, warm
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The heat energy from the sun passes through the greenhouse gas layer into the atmosphere and heats the earth.
The heat energy from the ground is partly reflected into the space, but some is trapped in the atmosphere.
Therefore, the earth is kept warm. This is the natural greenhouse effect on the earth.
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Is the natural greenhouse effect Is the natural greenhouse effect good? Why?good? Why?
It keeps the earth from getting too hot or too cold and makes the earth a comfortable place to live.
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Greenhouse gasesGreenhouse gases
Carbon dioxide (CO2) Methane (CH4) Water vapour nitrous oxide (N2O) etc.
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III. Enhanced greenhouse effectIII. Enhanced greenhouse effect
If the greenhouse gases continue to increase, what will happen?
Video 1
Video 2
Video 3
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Global warming
Enhanced greenhouse effect
Glaciers melting
Sea level rising
More typhoons and hurricanes
More floods
More …
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Causes of the enhanced Causes of the enhanced greenhouse effectgreenhouse effect
A: Burning fossil fuels causes increase in CO2 and other greenhouse gases.
B: Living creatures, such as humans and animals, produce more methane (CH4).
C: Deforestation makes it difficult to absorb the greenhouse gases.
On the one hand, humans are producing more and more greenhouse gases.
On the other hand, there are not enough plants to absorb the greenhouse gases.
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IV. The cure for the enhanced IV. The cure for the enhanced greenhouse effectgreenhouse effect
Chinese government’s policy: save the energy and reduce the greenhouse gas emission!
What can we do?
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3-R Principle3-R Principle
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Summary: greenhouse effect—the Summary: greenhouse effect—the theorytheory
The heat energy from the sun __________ the greenhouse gas layer into the ________ and ____ the earth. The heat energy from the ground is partly _______ into the space, but some is ______ in the atmosphere. Therefore, the earth is kept ____. This is the natural greenhouse effect on the earth. However, with the ______ of greenhouse gases, more and more heat is _____ in the atmosphere. Then, we have the _______ greenhouse effect.
passes through
atmosphere
heats reflect
edtrapped
warm increa
setrapp
edenhanced
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HomeworkHomework
Make a poster to introduce the EGE and the 3-R principle;
Persuade your relatives and friends to carry out the 3-R principle.