In the United States and Canada, the MOST common problem with using wood as a major heat source is
A) The cost
B) Wood shortages
C) That it separates people from the utility grid
D) The production of pollutants
E) None of these is correct
Correct Answer:
Verified
Q22: Active solar energy systems involve
A) Large volumes
Q23: Amorphous silicon collectors are currently being used
Q24: Where does wind energy have the greatest
Q25: Photovoltaic cells work because solar energy striking
Q26: Photovoltaic electricity costs are _ coal or
Q28: The most effective technology developed so far
Q29: Since the 1920s, hydropower production has
A) Risen,
Q30: In the United States, windmills played a
Q31: Burning methane from dung
A) Is more efficient
Q32: Jatropha is a good source for biodiesel
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