Which of these is a disadvantage of hydrogen fuel cells?
A. Engines that use hydrogen fuel are more efficient than gasoline-powered engines.
B. The only emission produced by hydrogen fuel cells is water.
C. Hydrogen fuel is continually available and useful for heating.
D. Hydrogen fuel is often purified in a process that emits lots of greenhouse gases.
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Home » Advanced Placement (AP) » Which of these is a disadvantage of hydrogen fuel cells? A. Engines that use hydrogen fuel are more efficient than gasoline-powered engines. B. The only emission produced by hydrogen fuel cells is water. C.