The document describes the research that will be undertaken in this project over the next five years. Its purpose is twofold. First, it presents the scientific questions that must be addressed in order to answer important public policy needs concerning the potential environmental effects of global climatic change. Second, it describes the general research approaches that will be used to answer the scientific questions. The document is organized into four sections: an overview of the project, a description of the research tasks that will be undertaken, a discussion of the relationship of the project's research with other global change research, and a budget summary.