Solar fuels such as hydrogen are being studied as sources of energy. All of the following statements about hydrogen as a fuel source are true EXCEPT
A. Fuels that are produced using sunlight as the energy source and water as the chemical feedstock are clean and renewable.
B. Solar-hydrogen systems use materials that are abundant and do not harm the environment.
C. Significant amounts of carbon dioxide would be emitted.
D. Solar-hydrogen systems rely on compounds that increase efficiency.
Answer:C
Solar fuels such as hydrogen are being studied as sources of energy. All of the following statements about hydrogen as a fuel source are true EXCEPT
A. Fuels that are produced using sunlight as the energy source and water as the chemical feedstock are clean and renewable. B. Solar-hydrogen systems use materials that are abundant and do not harm the environment. C. Significant amounts of carbon dioxide would be emitted. D. Solar-hydrogen systems rely on compounds that increase efficiency.