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A significant portion of the carbon dioxide emissions that have been shown to cause global warming are due to household energy consumption and traffic. EcoIsland is a computer system aimed at persuading and assisting individual families in changing their lifestyle patterns in a way that reduces CO2 emissions. The system builds on our earlier work on persuasive ubiquitous computing applications and applies ideas from behaviorism, social psychology and emissions trading to attempt to motivate changes in users' behavior. In this paper, we briefly describe the concept and the theories behind it, and provide preliminary results from a user study measuring its effectiveness.