This book presents selected papers dedicated to Sustainability and Energy presented at the ICOWEFS 2025 edition, offering a broad overview of current research and practical innovations across environmental management, renewable energy, sustainable cities, ecological conservation, circular economy solutions, and emerging technologies. Readers will find contributions spanning topics such as climate impacts, green infrastructure, biodiversity, sustainable materials, energy optimization, waste management, and community-centred environmental strategies-reflecting the wide interdisciplinary scope of the conference and highlighting both scientific advancements and applied approaches toward building a more sustainable future.