Although hydroelectric dams generate electricity without producing greenhouse gases, they ________
A) contribute only about 5% of the electrical power throughout the world
B) are short-lived structures that have to be rebuilt about every 20 years
C) still produce more greenhouse gases per unit of electricity produced than coal power plants
D) cannot provide a consistent supply of electricity during times of naturally low river flow
E) can harm aquatic organisms downstream by affecting water temperature
Answer: E
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