Chang focuses on greenhouse gas emissions management, standards and tools. A certified greenhouse gas (GHG) auditor, Chang has first-hand experience in GHG emission accounting and project development in Clean Development Mechanism (CDM) and Joint Implementation (JI). She is now dedicated in transferring experience and knowledge in Low Emission Development to the urban level. Chang is actively involved in the further development of the Global Protocol for community-scale GHG Emissions (GPC) and outlining a Measurable, Reportable, Verifiable (MRV) process for local climate action.