Renewable energy

Renewable energy is any type of energy generation that isn't dependent on a limited resource like fossil fuels. Renewable energy may be used directly, such as solar ovens, geothermal heat pumps, or windmills. Other forms of renewable energy sources generate electricity, such as [solar power cells]?, wind generators, tidal waves and hydroelectric? power. Still other forms generate fuels, such as vegetable oils generated from biomass?.

Most renewable energy can trace their root to solar energy, perhaps with the exception of geothermal and tidal wave power. For example, wind is caused by the density difference of the air when the sun heats various parts of the earth unevenly. Hydroelectric power can be ultimately traced to the sun too. When the sun evaporates water in the ocean, the vapor forms clouds which later falls on mountains as rain which runs through turbines to generate electrity. The transformation goes from solar energy to potential energy to kinetic energy to electric energy.

Most renewable energy sources have no emissions, with the exception of biomass fuels. Even for biomass, however, the generation of new plantlife consumes the same elements from the atmosphere that it emits when burned.

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