Which method would be least effective in improving U.S. air pollution laws?

A. Refocusing on pollution prevention
B. Increasing vehicle fuel efficiency
C. Better ventilating homes and buildings
D. Increasing regulations on motorcycles and two-cycle engines
E. Better regulation of airports and cruise ships


Answer: C

Environmental & Atmospheric Sciences

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A) the loss of communities from the planet B) always caused by human disturbance C) proceeding more slowly now than at any other time D) the disappearance of a species from Earth E) something that occurs only rarely

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The rock formations of the ________ era are more widespread and less disturbed than those of any other time

Fill in the blank(s) with correct word

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Which of the following is a triggering mechanism for mass wasting?

A. Drought B. Slope reduction C. Heavy rain D. Excessive vegetation

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What percentage of our commercial energy mix comes from wind energy?

A. <1% B. 5% C. 7% D. >23%

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