Campaigners argue that the entrenched government supports for corn ethanol have blocked the development of next generations of greener biofuels made from wood or the non-edible parts of plants , known as cellulosic biofuels .
Advance everything from zero-emissions coal plants ( still nonexistent ) to cellulosic ethanol .
推动一切能源产业包括尚不存在的0排放煤电厂和纤维质乙醚。
Industry executives concede they 'll fall far short of the mandated 2010 level of 100 million gallons of biofuels made from cellulosic materials such as prairie grass or cornstalks .