Recent expansions of diaspora rights have given overseas residents increasing political voice. This is particularly significant for environmental politics, because expatriates’ distinctive values, which are typically more cosmopolitan and multicultural than those of domestic voters, are likely to align with values of green organizations. Large-N analyses of an original, cross-national data set of election returns confirm this hypothesis: political parties from the ecological family receive larger shares of the emigrant vote than of the domestic vote, even when controlling for other factors that may win diaspora votes. Enhancing expatriates’ political power may accordingly increase the influence of a country’s environmentalist groups and parties.

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