Asked by stacey

what are the types of renewable energy alternative?
what are some challenges with using and managing these alternative, renewable energy resources?
Answered by Ms. Sue
http://en.wikipedia.org/wiki/Renewable_energy

http://www.nrel.gov/

http://www.eia.doe.gov/kids/energyfacts/sources/renewable/renewable.html

http://www.sciencedaily.com/news/earth_climate/renewable_energy/
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