Global Warming oJAbATJCugs.

Global Warming

http://www.youtube.com/watch?v=oJAbATJCugs

What is greenhouse effect?

• There are gases in the air that can trap heat from the sun.

• These gases are:– Water vapour– Carbon dioxide– Methan– Nitrous oxide – CFCs

• Some of these gases are naturally present in the air– Carbon dioxide for example is released when

plants respire– Water vapour is in the air because water

evaporates from the seas and oceans– Bacteria breaks down in the soil also release

methane. Cows too.

• The Greenhouse effect is the warming process of the earth’s environment. In the night, this heat keeps us from freezing. We can live comfortably because it is not too cold. Plants also need the heat to stay alive.

• There is a great increase of greenhouse gases in our environment these days because– We are burning fossil fuels when we use our

cars and for industrial purposes

• These gases don’t break down easily and so they stay in the air so more heat is trapped

• What do you think is happening to the earth as a result of this heating?

• See page 169 of textbook

Results….of Global Warming

• Change in weather conditions– Generally our earth is hotter by 1.5 to 4.5

degrees– More water will evaporate

• If the country already has very dry weather conditions, this will make the country even drier so less rainfall

• Plants and animals will suffer• There may not be enough water to grow food for

the people• People starve and die

Famine

Severe weather

Rising Sea Levels

• When the temperature rises, sea levels are likely to rise too

• The heat will cause ice caps in the North Pole and South Pole to melt

• The sea levels could rise between 20cm to 50cm.– http://www.youtube.com/watch?v=yHTWDBF_

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What can we do?

• http://www.youtube.com/watch?v=nRGgQIqRK48