Energy producers who met with skyrocketing food prices and international protests while using food crops to create large quantities of biofuels are now eyeing inedible waste. Given some technological advancement, the outlook is promising: "So the goal now is to efficiently convert so-called 'second-generation' sources—grasses, wood, paper and the inedible waste from food crops—into biofuels. One of the main biofuels is bioethanol, which could supplement or even replace gasoline as a transportation fuel," says the New Scientist.