An 'ARE YOU SMARTER THAN AL GORE?' energy quiz

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2. For every two minutes a car idles, it uses the same amount of fuel it takes to drive

a) a quarter-mile

b) a half-mile

c) a mile

Previous answer:

1. Which laundry method saves more energy?

b) washing with cold water instead of hot water

A study published in the Proceedings of the National Academy of Sciences in July showed that most people surveyed got this question wrong. The study found that "participants underestimated energy use and savings by a factor of 2.8 on average, with small overestimates for low-energy activities and large underestimates for high-energy activities."

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