So what’s so special about hydroelectricity? The fact that it’s already being used.
Hydroelectricity already supplies 20%of the world's energy - And it has the potential for more

Hydroelectricity already supplies 20%of the world's energy - And it has the potential for more
(via thethoughtsontheworld.blogspot.com)
Submitted by Simmons on Mon, 2007-08-20 17:51.
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It's not as peachy as you make it out to be...
Hydroelectric has its own issues. Like the fact that you have to create dams that screw up eco-systems.
This article totally ignores the fact that salmon populations are being decimated by dams. To you this is a "small disadvantage", but I am sure the salmon and other wildlife that are being destroyed would disagree.
To see the real potential impact of dams, check this out. http://www.irn.org/basics/impacts.html
Yes this is better than us all dying from air pollution, but there are surely better options than this.
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