This report is organized around the three overarching positive impacts of incorporating zero waste systems into current waste management methods: climate mitigation, climate adaptation, and additional societal benefits (also referred to as co-benefits). The final chapter of the report offers case studies that model the effects of zero waste strategies in eight different cities, demonstrating that zero waste is a powerful mitigation strategy that is highly adaptable to different needs and circumstances. Cities around the world have already implemented zero waste systems. With these eight case studies, this report offers a new quantitative assessment of the mitigation benefits of such programs.