Sun water and wind are alternative sources of energy. Wind rotating the windmill and moving the sail . It's a clean source and a lot of energy . Unfortunately, if the wind does not blow . there is no wind energy. As water moves from one place to another , it makes energy. However, people have to build dams to use this energy source. The dams cost a lot of money , so water is expensive too.

The sun releases large amounts of energy each day. This energy can be converted into electricity . Mary countries use solar energy for their daily lives. Solar panels on the roof can generate enough energy to heat or cool the antire home . Solar energy is not only abundant and infinite but also clean and safe .a

Desfite some drawbacks , the potention of onternative energy sources is enormous . However , how to make full use of the energy resources is a question for researchers all over the world.