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1. For a long time, people have been using water to power machines.
2. Solar panels will take the place of the roof a house and sun's energy will be used to heat water.
3. We use energy from the sun, the wind and the water.
4. We are looking for cheap, clean, effective source of energy that doesn't cause pollution or waste natural resources.
5. Recently, wind has been used to generate electricity.
6. At present, most of our electricity comes from the use of coal, gas, oil or nuclear power.
7. This power could be provided by the Sun.
8. If we were able to collect solar energy, we would be sure to have enough power.
9. Scientists are trying to find other alternative sources of energy
10. One percent of the solar energy reaches the Earth is enough to provide power for the total population.
11. Vietnam has an advanced technology in solar energy.
12. The energy can be stored for a number of days.
13. Car will be using solar energy instead of gas by the year 2030.
14. On cloudy days, you can use solar energy too
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