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What is the cheapest energy source to produce?
/ In addition, which one is unharmful for human beings. /
Free as a bird, it's the next best thing to be. Free as a bird.
It depends on who you ask. Here is one you probably didn't think of: seaweed. Read this article for more details.
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Hello,
Thank you for your info!
http://www.woodpeckershareware.com/blogger/home-made-energy/http://www.swanshareware.com/blogger/energy-2-green/http://www.swanshareware.com/blogger/earth-4-energy/
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