In some areas of the world dams are being removed from rivers…why?

Whilst dams are seen by many as an important source of relatively “clean” energy, they have a dramtic effect on river systems. In some places, dams are being removed, the reasons for this and the effects of the reversal are discussed in the article on this link:

http://www.geotimes.org/mar08/article.html?id=feature_dams.html

In the Grand Canyon, USA, some dams are opened up to their fullest extent occasionally to promote the environment downstream:

http://news.bbc.co.uk/1/hi/in_pictures/7281024.stm

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