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Everyone has been conditioned to flick off lights when they leave a room – or, if they forget, to tromp dutifully back to turn them off. Many such energy-saving actions have become routines that make us feel very green, very much the global good citizens helping to reduce dependence on fossil fuels. We don't really know how Al Gore would do on this quiz. But if you take it and ace it, you might feel a little competitive with the man who won the Nobel Peace Prize for his efforts to counter climate change by reconsidering the energy choices behind the problem. Take our quiz and find out how much you really know about your energy use:

- Staff

This quiz is part of a cover story project of the Nov. 8, 2010 issue of The Christian Science Monitor magazine. The full package of stories will be posted here during the week of Nov. 8.
(Thanet Offshore Wind Farm at Ramsgate, England. Gareth Fuller/AP)

1. Which laundry method saves more energy?

a) using a clothesline instead of a dryer

b) washing with cold water instead of hot water

(Answer on next page)