... Though biofuels have been touted for their ability to reduce greenhouse gas emissions, assessing the environmental impact of bioethanol requires including greenhouse gas emissions related to the crops needed for its production. And "the carbon balance of ethanol relative to gasoline isn't as good as it was originally anticipated," Tyler Lark, a scientist at the University of Wisconsin-Madison told AFP. In 2005, Congress passed a "Renewable Fuel Standard," which required transportation fuel to include a volume of biofuel that increased over time. The law was further expanded in 2007. As a result, 2.8 million additional hectares of corn were...