Going Green 8, exercise 2B, page 153 alternative energy 64% of the electricity we need comes from burning fossil fuels such as oil, gas and coal.0:01
These resources pollute and are not renewable, so once we have burned them all up, there will be no more.0:29
This means that the world must find and use alternative sources of energy fast.0:37
This alternative energy needs to use no fossil fuel and create no waste or pollution.0:45
Sun Solar Power Enough of the sun's energy hits the Earth every minute to power the world for a whole year.0:53
In sunny countries, solar cells can be put on rooftops to convert sunlight directly into electricity.1:02
We could even build solar power stations like Solar One in California.1:10
This uses the sun's heat to make steam, which then drives a generator to produce electricity.1:17
Wind Wind Power we can use the power of the wind by building wind turbines.1:25
These are tall towers with a big propeller on top.1:32
The wind blows the propeller, which turns a generator in order to create electricity.1:36
If we build a number of wind turbines together in a windy place, we can make a wind farm and produce quite a lot of electricity.1:43
Water Hydroelectric Power A dam can be used to trap a large area of water, like a reservoir or a lake.1:53
This water then flows through tunnels in the dam, turns turbines, and drives generators to create electricity.2:03
Hydroelectric power stations can produce a lot of power very cheaply.2:12
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