This research paper aims to explore the knowledge gap among young designers in relation to sustainable human-computer interaction (HCI), focusing on Interaction Design, and investigating the necessary resources for designing sustainable HCI. Lack of knowledge among young designers regarding sustainable practices in digital design contributes to the overconsumption of energy, and increased carbon emissions, highlighting the need to raise awareness and bridge the knowledge gap in Sustainable Human-Computer Interaction (HCI) design among youth. Using qualitative methods, including 14 semi-structured interviews with informatics students in Jönköping, Sweden, the study identifies three main themes: Lack of Knowledge, Resource Needs, and Concerns About the Design Process. The findings highlight a limited understanding of sustainable HCI among young designers, emphasizing the significance of educational modules in sustainability within digital design. This study provides insights and recommendations for digital designers, educators, and policymakers to implement sustainable digital design practices in order to lessen environmental impact and promote sustainability within the digital world. The implications of this study include addressing the knowledge gap, fostering educational initiatives, and serving as a foundation for future research in sustainable digital design and HCI. This study addresses the challenge of motivating young designers to learn more about sustainable HCI while identifying essential resource requirements, education, design tools, eco-feedback technology, and support.