"A growing body of evidence has shown some biofuels produce more carbon-dioxide emissions than traditional fossil fuels when taking into account how land is used to grow the crops, such as the clearing of forests. They also have repercussions for food prices, as the cultivation of biofuel crops reduces the amount of land available for other crops."
http://online.wsj.com/article/SB10001424127887323740804578599090391064624.html?mod=googlenews_wsj
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