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If your cold-water tap runs at a chilly 60 degrees and you want 100-degree water for a nice hot shower, which of the following water heater temperature settings is the most energy-efficient choice?
 










If you take an eight-minute shower using a conventional showerhead, switching to a low-flow showerhead would be equivalent to shortening your shower to how many minutes?
 








What's the most Earth-friendly napkin use habit?
 








Compared with hand washing a load of dishes in hot water with a low-flow faucet, using a dishwasher clearly saves time. What else does it save?
 











Besides composting, of course, what is the most environmentally benign way to dispose of food scraps?
 








If you use a traditional wood-burning fireplace, which of the following are ways in which you can improve its heating efficiency?
 








When you're away at work during summer days, is it more energy-efficient to leave your air conditioner on, keeping the temperature steady, or to blast the AC when you return home to cool down the hot box?
 










When you're washing clothes, is it better for the environment to use non-toxic soap in a plastic bottle, or conventional powder in a box?
 







Compact florescent lights (CFLs) are better than regular bulbs. And motion sensors can limit the time that lights are on in an empty room. But many sensors aren't compatible with CFLs. Which lighting strategy is most energy efficient?
 








Producing an average cotton T-shirt requires a little more than 6 ounces of material. How many ounces of chemical fertilizers and pesticides are used to produce that much cotton?
 







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