The paper provides a comprehensive overview of the benefits of emissions trading systems (ETS) worldwide. It is based on research conducted by the ICAP Secretariat, surveying official information, grey and academic literature. The authors argue that ETS can be an effective tool for reducing greenhouse gas emissions and promoting sustainable development. The paper presents evidence of the positive impacts of ETS on emissions reduction, economic growth, and job creation. It also highlights the importance of designing ETS that are transparent, flexible, and market-based. Overall, the paper provides a strong case for the adoption of ETS as a key component of a comprehensive climate change mitigation strategy.