"Designing Green Support Programs" is the second in a series of reports on Green Support Programs from the Henry A. Wallace Institute for Alternative Agriculture. The first report in this series, "Lean, Mean and Green .. Designing Farm Support Programs in a New Era," by Sarah Lynch and Katherine R. Smith, provides a broad overview of the concept of Green Support Programs (GSP). A GSP would combine in one program the dual objectives of supporting farmers income and providing environmental protection from agricultural pollution. "Lean, Mean and Green ... " identifies critical decisions that must be made in designing a GSP and explores the implications and trade-offs of alternative program designs. "Designing Green Support Programs" provides an in-depth analysis of several of the critical decisions that must be made in designing a GSP. In the first paper of this volume, Sarah Lynch provides a brief overview of agriculture's environmental problems and highlights some of the strengths and weaknesses of alternative approaches to addressing these problems. Ralph E. Heimlich explores the geographic distribution of potential agroenvironmental problems and discusses the implications of this distribution on program targeting to enhance cost-effectiveness. The issue of incentive compatibility between existing farm programs and a GSP is examined by C. Ford Runge. Sandra Batie discusses the availability of sustainable, environmentally friendly alternative technologies and production practices, and barriers to their adoption. Finally, Jerry Skees explores program administration issues that must be confronted when designing and implementing a GSP. Collectively, these papers' add considerable depth to our understanding of the important issues and trade-offs that must be considered in designing a GSP. In so doing they inform the on-going debate over the strengths and limitations of GSPs and the potential role they might play in the next generation of farm programs.