As soon as decision makers are expected to make differences towards sustainable future, young adults′ ability to make informed and sound decisions is considered essential towards securing our planet. This study provides an insight into young adults′ knowledge of key environment and sustainability issues. To answer the key research questions, data were obtained using a qualitative phenomenographic research approach and collected through 18 face-to-face in-depth interviews with research participants. The findings of this study suggest that young adults lived experiences that play a huge role in their level of awareness of topical environmental and sustainability issues critical to humanity′s future on earth.