Today's society is characterized by consumption and materialism, with e-commerce contributing to increased availability of products and services, leading to overconsumption. Generation Z is an environmentally conscious generation, but previous research claims this is not always reflected in their consumption behavior. The aim of the study is to gain an increased understanding of how factors such as individual intentions, social influences and the dilemma between individuals and the collective interest affect the purchasing behavior of Generation Z. By examining the factors the study aims to contribute to and increase understanding of why Generation Z's attitude to sustainable consumption is not always reflected in their purchasing behavior. We examine this using the Theory of Planned Behavior, the social dilemma, and purchasing behavior. We worked with a convenience sample, limiting Generation Z to the ages 2002-1997. This delimitation is based on the conditions of strong purchasing power and personal responsibility for consumption that the older members of the generation possess. A qualitative method was used in the study, and data were collected through semi-structured interviews. From the 18 interviews conducted, transcription and coding created a result that through analysis led to our conclusions. The study's results show that Generation Z has a lack of knowledge about sustainable consumption and experiences significant pressure from marketing to consume more. The results also show that the decisive factor for changing Generation Z's consumption behavior towards sustainability is influence from close ones. The study has contributed to an increased understanding of why Generation Z's environmental awareness is not always reflected in their consumption behavior and what is required for them to focus on sustainability and the environment in their consumption.