This working paper focuses on national greenhouse gas (GHG) inventories. It draws upon case studies from Brazil, Colombia, India, Mexico, and South Africa and highlights seven emerging good practices that these countries have used to develop capacity and improve and sustain their national GHG inventory systems. There are:  sustained institutional arrangements; identification and enabling of a lead agency to manage the national GHG inventory process; sectoral coordinating institutions with well-defined roles, responsibilities, and processes; detailed institutional mandates and data-sharing agreements that include work schedules; processes to archive inventory information and retain institutional memory;  sufficient, well managed, and sustained financial resources  an iterative approach to improving the national GHG inventory system.