Millennials' Sustainable Lifestyle: Role of Knowledge, Attitudes, and Digital Platforms

The purpose of this study was to investigate how environmental knowledge, perceptions of green consumption, and perceptions of digital applications in-fluence sustainable lifestyles among Indonesian millennials. This study re-lates to the Sustainable Development Goals (SDGs), specifically SDG 12 (Responsible Consumption and Production) and SDG 13 (Climate Action), both of which promote changing consumer behaviour and the use of environmentally friendly technologies. A survey of 200 millennials was conduct-ed for this study. The Partial Least Squares Structural Equation Modelling (PLS-SEM) analysis method was used with SmartPLS 4 software. The results showed that environmental knowledge had a positive and significant effect on attitudes toward green consumption, but a negative effect on attitudes toward green digital applications. Attitudes toward green digital applications showed a positive and significant effect on a sustainable lifestyle, while attitudes toward green consumption had no significant effect. Only views on digital applications, which act as mediators in the relationship be-tween environmental knowledge and sustainable behaviour, were relevant for testing the mediation effect. These results demonstrate that environmental literacy and the adoption of green digital technologies are essential for promoting a sustainable lifestyle among Millennials. This study provides theoretical and practical support for developing digital sustainability strategies.