I have heard that some people are worried that renewable fuel standards or low-carbon fuel standards or simple market forces favoring biofuels will "cause people to rip up sustainable soybean fields and turn them into big switchgrass plantations." And that EPA is proposing elaborate new laws saying that farmers and foresters cannot grow biofuel crops on land previously used for other purposes. Is this true and what do you think about all that? – Lisa N., Wilton, CT