Water is at present the leading renewable energy source used by electric utilities to generate electric power. Currently there are numerous hydro-electric power stations, providing around 20% of the world’s electricity. The name “hydro” comes from the Greek word for water. The water cycle of evaporating from the heat of the sun and falling back to earth is continuous, thus hydropower is considered a renewable energy resource.

Hydropower facilities intercept the water on its descending path, converting its mechanical energy into electricity. Hydroelectric power plants operate where suitable waterways are available; many of the best of these sites have already been developed. Generating electricity using water has several advantages. Besides being a source of cheap power it has an advantage of no fuel combustion, there is negligible air pollution in comparison with fossil fuel power plants and limited thermal pollution compared to nuclear plants.

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Climate change isn’t just about a few degrees variation

Here it is the altering of environment faster than we can possibly predict the consequences. The debate ! whether changes are coming but how severe they’ll be.

Global Warming

Global warming is the gradual raise in temperature of the Earth’s surface that has aggravated considerably since the industrial revolution. Over the past two decades the effect has become more than noticeable. The global average temperature has increased 14 to 18 degrees C since the late 1800’s. Many experts estimate an additional 14 to 18 degree rise in the average temperature by 1

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The ultimate source energy is the sun which provides the earth with light, heat and radiation. Every hour the sun radiates onto the Earth more than enough energy to satisfy global energy needs for an entire year.

When sun’s energy is harnessed and made useable it is called solar energy. While many technologies derive fuel from one or the other from form of solar energy, there are also technologies that directly transform the sun’s energy into electricity.

Solar energy is our earth’s core source of renewable energy since generating electricity directly from sunlight does not deplete any of the earth’s natural resources and supplies the earth with energy continuously.

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Bioenergy is derived from biological sources such as wood, waste, and alcohol fuels. In a narrow way it is a synonym to biofuel; the fuel derived from biological sources. In its broader sense it includes biomass which is the biological material used as a biofuel. This is a common misconception among masses, as bioenergy is the energy extracted from the biomass, as the biomass is the fuel and the bioenergy is the energy contained in the fuel.

Burning wood for heat is a good example of Bioenergy. In more complicated terms, bioenergy can be formed by using genetically modified bacteria to create cellulose ethanol. Although oil and coal are made from organic mater, they are not considered to be bioenergy as they were not living recently.

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