Greenhouse Effect, Greenhouse Effect, Natural and EnhancedNatural and Enhanced

November 19, 2008November 19, 2008

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?

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

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.

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

heat energy, pass through, greenhouse gas layer, heat the earth

part of the energy, reflect, space, some, trapped in the atmosphere

earth, warm

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.

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.

Greenhouse gasesGreenhouse gases

Carbon dioxide (CO2) Methane (CH4) Water vapour nitrous oxide (N2O) etc.

III. Enhanced greenhouse effectIII. Enhanced greenhouse effect

If the greenhouse gases continue to increase, what will happen?

Video 1

Video 2

Video 3

Global warming

Enhanced greenhouse effect

Glaciers melting

Sea level rising

More typhoons and hurricanes

More floods

More …

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.

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?

3-R Principle3-R Principle

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

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.