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About Renewable Energy
People all over the world currently rely heavily on coal, oil, and natural gas for their energy. Fossil fuels are nonrenewable, that is, they draw on finite resources that will eventually dwindle, becoming too expensive or too environmentally damaging to retrieve.

n contrast, renewable energy resources are constantly replenished and will never run out. New energy includes bioenergy, solar energy, photovoltaic, wind energy, geothermal energy, ocean energy, small Hydro and so on. These energy sources occur naturally and continuously in the environment, will be essentially inexhaustible. We call them renewable energy. In modern times, the development of renewable energy is more and more important for human being to release the conventional energy crisis. Meanwhile, reducing the emission of greenhouse gases to stop global warming is the new international target of the whole world, to achieve this, changing demand from conventional energy to renewable sources of energy will be an effective way. 

In recent years, the technologies of using renewable energy, particularly energy from wind, solar power, ocean and biomass, are developing fast. 

Most renewable energy comes either directly or indirectly from the sun. Sunlight, or solar energy, can be used directly for heating and lighting homes and other buildings, for generating electricity, and for hot water heating, solar cooling, and a variety of commercial and industrial uses.

The sun's heat also drives the wind, whose energy is captured with wind turbines. Then, the winds and the sun's heat cause water to evaporate. When this water vapor turns into rain or snow and flows downhill into rivers or streams, its energy can be captured using hydropower.

Along with the rain and snow, sunlight causes plants to grow. The organic matter that makes up those plants is known as biomass. Biomass can be used to produce electricity, transportation fuels, or chemicals. The use of biomass for any of these purposes is called biomass energy.

Hydrogen also can be found in many organic compounds, as well as water. It's the most abundant element on the Earth. But it doesn't occur naturally as gas. It's always combined with other elements, such as with oxygen to make water. Once separated from another element, hydrogen can be burned as a fuel or converted into electricity.

Not all renewable energy resources come from the sun. Geothermal energy taps the Earth's internal heat for a variety of uses, including electric power production, and the heating and cooling of buildings. And the energy of the ocean's tides comes from the gravitational pull of the moon and the sun upon the Earth.

In fact, ocean energy comes from a number of sources. In addition to tidal energy, there is energy of the ocean's waves, which are driven by both the tides and the wind. The sun also warms the surface of the ocean more than the ocean depths, creating a temperature difference that can be used as an energy source. All these forms of ocean energy can be used to produce electricity.

Renewable energy provides many important benefits including:

  • Environmental benefits
  • Energy for the future
  • Jobs & the economy
  • Energy security

 

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