The Emergy Systems website was developed in response to a demand expressed by the community of scientists, students, and friends for a central location of materials, information and news related to Emergy. Emergy theory and practice coalesce principles and data from basic research in thermodynamics of self-organizing system, ecology, energy systems, systems ecology, ecological economics, and ecological engineering into an understanding of human and environmental systems. Emergy research has spanned such global problems as population carrying capacity, greenhouse emissions, material fluxes in conventional and renewable energy production systems, and sustainable patterns of development at local, regional, national and global scales. The Emergy Systems site is designed to aid in the research and teaching of emergy systems theory. Our mission is to provide a locus for those interested in obtaining information about the theory, concepts, and principles of emergy systems and systems ecology.