Deutsche Presse-Agentur: The US rush to plant more corn for biofuel is already being blamed for soaring food prices. Now, two new US studies show that cultivated biofuel crops may actually increase instead of decrease the carbon emissions that ethanol and other biofuels were supposed to reduce. The studies used a worldwide agricultural model to calculate how corn-based ethanol nearly doubles greenhouse emissions over 30 years. Planting switchgrass and other wild crops on farm land, as advocated by US …