Alternative Energy Sources
To understand how alternative energy use can help preserve the delicate ecological balance of the planet, and help us conserve the non-renewable energy sources like fossil fuels, it is important to know what types of alternative energy is out there.

Wind Power
Wind energy harnesses the power of the wind to propel the blades of wind turbines. The rotation of turbine blades is converted into electrical current by means of an electrical generator. In the older windmills, wind energy was used to turn mechanical machinery to do physical work, like crushing grain or pumping water.Wind towers are usually built together on wind farms. Now, electrical currents are harnessed by large scale wind farms that are used by national electrical grids as well as small individual turbines used for providing electricity to isolated locations or individual homes. In 2005, worldwide capacity of wind-powered generators was 58,982 megawatts, their production making up less than 1 of world-wide electricity use.

Pros


* Wind power produces no pollution that can contaminate the environment, Since no chemical processes take place, like in the burning of fossil fuels, in wind power generation, there are no harmful by-products left over.
* Since wind generation is a renewable source of energy, we will never run out of it.
* Farming and grazing can still take place on land occupied by wind turbines which can help in the production of biofuels.
* Wind farms can be built off-shore.



Cons

* Wind power is intermittent. Consistent wind is needed for continuous power generation. If wind speed decreases, the turbine lingers and less electricity is generated.
* Large wind farms can have a negative effect on the scenery.



Solar Power
Solar energy is used commonly for heating, cooking, the production of electricity, and even in the desalination of seawater. solar power works by trapping the sun's rays into solar cells where this sunlight is then converted into electricity. Additionally, solar power uses sunlight that hits solar thermal panels to convert sunlight to heat water or air. Other methods include using sunlight that hits parabolic mirrors to heat water (producing steam), or simply opening a rooms blinds or window shades to allow entering sunlight to passively heat a room.

Pros

* Solar power is a renewable resource. As long as the Sun exists, its energy will reach Earth.
* Solar power generation releases no water or air pollution, because there is no chemical reaction from the combustion of fuels.
* Solar energy can be used very efficiently for practical uses such as heating and lighting.
* The benefits of solar power are seen frequently to heat pools, spas, and water tanks all over.



Cons

* Solar power does not produce energy if the sun is not shining. Nighttime and cloudy days seriously limit the amount of energy produced.
* Solar power stations can be very expensive to build.



Geothermal Energy
Literally, geothermal means, "earth heat." Geothermal energy harnesses the heat energy present underneath the Earth. Hot rocks under the ground heat water to produce steam. When holes are drilled in the region, the steam that shoots up is purified and is used to drive turbines, which power electric generators.

Pros

* If done correctly, geothermal energy produces no harmful by-products.
* Once a geothermal plant is build, it is generally self-sufficient energy wise.
* Geothermal power plants are generally small and have little effect on the natural landscape.



Cons

* If done incorrectly, geothermal energy can produce pollutants.
* Improper drilling into the earth can release hazardous minerals and gases.
* Geothermal sites are prone to running out of steam.