This study explores nudging as a transformative tool for promoting sustainable consumption and waste management in Mombasa, Kenya and Västernorrland, Sweden. By a literature review and global best practice analysis to benchmark successful nudging interventions worldwide, the research gathered insights on the nuances, challenges, and tailored nudges, to offer actionable and evidence-based strategies for local governments. The study explains nudging in theory and contextualizes its application for real-world impact, for sustainability initiatives that are both effective and culturally resonant. Through this approach, the research bridges the gap between global knowledge and local implementation, and shows tailored nudging techniques that can significantly enhance sustainability efforts in diverse socio-cultural environments.