A problem with the use of biofuels is ________.
A) they have never been successfully produced
B) the United States has outlawed them
C) there is a food versus fuel debate
D) they emit more carbon dioxide than fossil fuels
E) they have never been successfully been used in trucks

Question

Quizplus · Accepted Answer

There is a debate over whether using crops to produce biofuels is ethical when they could be used for food production instead. This has created controversy and questions about the sustainability of using biofuels as an alternative to fossil fuels.

A Problem with the Use of Biofuels Is ________