28 Jul 2011 @ 12:38 AM 
solar energy4 Although the sun is useful in providing solar energy, it is harmful to man. How is it harmful?
Stella asked:


Fossil fuels such as oil and natural gas are non-renewable sources of energy. Solar energy is now considered the best alternative to replace fossil fuels.

Kansieo.com
best rated free energy footer Although the sun is useful in providing solar energy, it is harmful to man. How is it harmful?

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