| Summary: | The Environmental Action Scale (EAS) is an 18-item questionnaire designed to assess the degree of involvement in collective actions in favour of the environment. This scale is of interest for research in environmental domains, particularly the recent study of environmental activism. The main objective of this study is to contribute to the adaptation and validation of the Portuguese version of the EAS. The EAS Portuguese version — following its adaptation — was administered to a total of 346 participants. Confirmatory factor analysis revealed the two dimensions considered by the authors of the original version: participatory actions and leadership actions. In addition, evidence of validity was obtained based on the relationship with other variables such as environmental identity. In conclusion, the Portuguese version maintains the 18 items and replicates the two-factor structure, showing good psychometric properties.
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