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What is alternative energy?
Alternative energy is the energy we will be using in the future to replace what we are using now. The oil and coal we are using now not only pollutes the environment but it will not last too long in the future. Therefore, we need a clean source of energy that will also last forever. Scientists from many different countries are suggesting to use the wind, wave, sun, and hydrogen as energy sources.

 

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Solar Energy
Solar energy may be used from the sun's heat and light. Because solar power is everlasting, there is no worry that we will run out nor does it cause environmental pollution.?It is also easy to obtain. For example, solar houses use the sun's heat to heat water, and at night, the house is heated and the water can be used. Also, there are batteries that can change the sun's light into energy. However, the drawback is that we won't be able to use those batteries on cloudy days.

 

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Hydrogen energy
Hydrogen energy may be made from water and the only thing left over from burning hydrogen to make fuel is water, so it does not pollute the environment. If hydrogen cars are more widely used in our daily life, the air will be much cleaner than it is now. The drawback with hydrogen is that it takes up a lot of volume and there is danger of explosion. There are studies underway to solve these issues.

 

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Other energies
We can earn energy from the ocean. When the wave reaches the height of 1 meter, then we can earn 6~10kw of energy. Also, the difference in in-flow and out-flow of tides are used, where water is stored when the tide flows in and electrical energy is gained when the tide flows out. There is also the underground heat of earth and power of wind that produces energy.