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Political polarization is often analyzed at the mass level through examination of attitudinal differences, but little attention is devoted to how polarization might be manifested through differences in individual behavior, especially in areas that do not appear to be explicitly political in nature. Political polarization, however, may extend to differences in lifestyles among individuals, especially differences in prosocial environmental behavior. This could be especially true for behaviors that are perceived as markers of political attitudes. In an examination of self-reported recycling and conservation behavior, we find that controlling for a range of alternative explanations for why individuals engage in pro-environmental behavior, partisan and ideological dispositions are among the most robust causes of such behavior. We demonstrate that these behavioral differences are exacerbated by attention to political news. The findings indicate that the effects of polarization extend beyond political attitudes into social and economic choices. [ABSTRACT FROM PUBLISHER]