Enhancing urban waste sustainability through community-driven composting in São Paulo megacity

•Urban public administrations in LMICs face significant challenges in managing solid waste.•20.28 tons of organic waste composted, 27,662 lbs CO2 saved.•The mature compost generated proved to be of good quality for agricultural applications.•The community composting initiative in São Paulo, Brazil, exemplifies civil society-driven waste management with positive environmental and social outcomes.