Global environmental issues such as climate change and global warming have recently become a pressing concern for both policymakers and the general public. Consequently, climate change integrated assessments are developed and advanced by the academic communities as policy tools to assess climate impacts and initiate policy responses. It is generally assumed that scientific fin dings from these integrated assessments will constitute a key component in the development of environmental policymaking. However, science-policy interaction and evolution is a complex process and does not take place automatically. Growing from an integrated research project on the development and application of the regional climate models, this paper takes the United Nations Intergovernmental Panel on Climate Change (IPCC) as a case study. It gives an overview of integrated assessments, their characteristics, and their strengths and weaknesses in application. In particular, it addresses policy-relevant issues from a Taiwan perspective. In the end, drawing lessons from the IPCC science-policy process, it will also discuss potential challenges and opportunities confronting scientific communities in Taiwan, and call for a Taiwan-IPCC initiative.