This book showcases the latest knowledge and innovations in resource efficiency and sustainability, addressing critical challenges and opportunities in achieving a sustainable future. It features top-quality and cutting-edge research findings selected from the proceedings of the International Conference on Resource Efficiency Towards Sustainability (ICRES 2025). The themes of this book include Circular Economy, Renewable Energy Solutions, Sustainable Agriculture, Waste Management and Resource Recovery, Climate Change Adaptation and Mitigation, Green Supply Chains, Life Cycle Assessment, and Community Engagement for Sustainability. The ICRES 2025 conference is powered by INSEE Ecocycle, Sri Lanka, whose commitment to advancing sustainable practices has significantly supported the success of this event. For more information, please visit the conference website at https://icres.lk/