Business Green: The rise of ethanol as a fossil-fuel alternative in the US has led to an increase in food prices of around 10 to 15 percent and could adversely impact habitats, according to a financial watchdog. A report released last week by the US Congressional Budget Office (CBO), entitled The Impact of Ethanol Use on Food Prices and Greenhouse-Gas Emissions, warns that rising food prices and other environmental side-effects raise questions about the viability of ethanol as an alternative to …