Petitioner, contributor, protester

According to Stern (2000) the vast array of pro-environmental behaviours may be summarized into four major types. The first, labelled ‘environmental activism’, relates to active involvement in environmental organizations and protests. The second,‘non-activist public behaviours’, includes contributing money to environmental organizations, signing petitions in favour of environmental protection, or willingness to pay higher environmental taxes. The next cluster includes ‘private-sphere environmentalism’relating to ‘the purchase, use, and disposal of personal and household products with an environmental impact’(Stern, 2000, p. 409). Finally, the ‘other environmentally significant behaviours’ include the pro-environmental decisions and actions individuals take in the context of their professional lives.Past research has demonstrated that these types (eg Dietz, Stern and Guagnano, 1998; Stern et al., 1999), and to a certain extent even the individual behaviours within each type (eg Urban and Scazny, 2012; Botetzagias, Malesios and Poulou, 2014; for energy-saving behaviours), depend on a different combination of predictors or factors. Overall, four broad factor categories can be highlighted (cf. Stern, 2000):