If burning low-sulfur coal significantly reduces the emission of sulfurous fumes and therefore reduces acid rain, why don't plants in the Midwest and Great Lakes region burn only low-sulfur coal?
a. Because it can be burned only if plants are equipped with scrubbers
b. Because it is expensive
c. Because it produces far less energy than does high-sulfur coal
d. Because the major source of low-sulfur coal is Canada
e. Because the major source of low-sulfur coal is Mexico
Answer: B
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