| Zusammenfassung: | The present research addresses tools that could help reduce littering in society. Four interventions were tested which, based on different processes, should reduce littering: monetary information, the depicted injunctive norm, watching eyes and a nature picture. To test these interventions, a randomized controlled trial (RCT) involving 440 community building's waste disposal areas (N = 71,155) was conducted in Vienna. Littering was assessed before the intervention, 24–48 h after, and again seven weeks after the intervention. Results show that the financial intervention (monetary information) hardly had any effect on littering whereas the norm-based intervention (depicted injunctive norm) led to more littering compared to the control and in particular, the nature picture. In contrast, the reputation-based intervention (watching eyes) and ecology-based intervention (nature picture) reduced littering over time by 4.7%. Thus, interventions based on implicit and soft appeals to reputation and ecology are more effective in fostering clean environments than classical interventions applying explicit information on finances and norms.
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