This tool kit offers a step-by-step guide for economies in Asia and the Pacific looking to design, build, and implement emission trading systems (ETS) to help speed up their transition to a greener, more inclusive future. Using case studies to illustrate best practices and lessons learned by countries including Viet Nam and India, it explains the need to design robust legal frameworks before setting up ETSs. It outlines carbon taxes, analyzes fossil fuel subsidy rationalization, and shows why securing support from stakeholders is key for countries planning to implement ETS programs to help meet their climate targets.