started to use more energy, an average increase of 0.89 kilowatt hours per household per day—roughly the amount of energy it takes to wash eleven extra pounds of laundry each day. The researchers realized that simply telling people where they stood in comparison to their neighbors gave overachievers a license to use more energy. To deal with this problem, CialdinI added something new to the energy-use information sheets he was sharing with those in the study group: emojis. To the people who were using below-average amounts of energy, CialdinI gave happy-faced emojis. Those who were using too
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