Public engagement in pro-environmental behavior and support for pro-environmental policy are essential for achieving sustainable living. We propose that the moral circle is a common motivational source for engagement in environmentally beneficial activities across situations and may be thus drawn upon to efficiently promote these activities. Study 1 established an association between chronic moral circle size and nine pro-environmental activities from different domains. Via experimental manipulation of the moral circle size, Studies 2ad demonstrated its causal effect on intentions to engage in pro-environmental activities. Together, these studies offer an important initial demonstration of the beneficial consequences of more expansive moral circle in the domain of pro-environmentalism. Routes for expanding the moral circle and thus promoting pro-environmental activities are discussed. Copyright (C) 2012 John Wiley & Sons, Ltd.
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