We know that renewable energy is coming of age when trade wars breaks out among the various international players in the industry. 
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"U.S. manufacturers of wind turbine towers jumped into a growing renewable energy trade war Thursday, asking the U.S. Department of Commerce and the International Trade Commission to investigate and slap tariffs on Chinese and Vietnamese manufacturers for dumping towers in the U.S. market below cost."
 
http://www.oregonlive.com/business/index.ssf/2011/12/us_wind_tower_makers_seek_tari.html