Passage Summary: A company claims it's better for the environment to buy up old, dirty cars than to fix their own factories because those cars represent a much larger portion of total pollution.

Conclusion: Buying and disposing of old cars will result in a greater reduction of air pollution than redesigning the company's plants.

Reasoning: The company's plants are responsible for only 4 percent of local pollution, whereas cars built before 1980 are responsible for 30 percent.

Analysis: The spokesperson is confusing the 'total amount' of pollution from a source with the 'potential reduction' they can achieve. Even if old cars cause 30% of pollution, the company's plan only works if they can actually buy enough of those cars to offset the 4% they could eliminate by fixing their own plants. Look for an answer that suggests the car-buying program is too small in scale to outperform a total plant redesign.