Ecomaterials, or "Green Materials", are those designed so as to minimize their environmental impact, while still maintaining or even increasing the desired operational performance. Ecomaterials research is an interdisciplinary field where scientists and engineers with backgrounds in both chemistry, and in materials such as metals, ceramics, polymers, and carbon, are involved in raising the environmental consciousness of industry and in motivating ecological research. This volume contains the papers presented during the fourth international symposium on ecomaterials processing and design, which was held on February 4-6, 2003 in Kangnung, Korea.