Food vs. Fuel
Food vs. Fuel is a an argument used against the production of bioethanol. Since corn is currently the primary feedstock for the fermentation of ethanol, some argue it is wrong to use bioethanol for energy when it takes away food from people and animals who need it.
Opponents to the Food vs. Fuel argument note that corn is not the only feedstock for bioethanol. The cellulose in the stalks of corn can be used to produce ethanol, which would not reduce food stocks at all.