Material Recycling and Landscape Good use of materials such as water, forests, and soils requires consideration of their embodied energy, since these values can help with determining environmental priorities. Fitting of humanity and nature requires compatible interface ecosystems for material reprocessing, which provides guidelines for organizing water courses and humanity in redevelopment and landscape renewal. The principles of waste water use in swamps tested for sewage need to be considered as a general principle by study of other interfaces. As non-renewable resources become of lower quality and deeper, more and more mining and land disturbance will be required. For reclamation, we need principles of landscape design that meet the requirements of hierarchical arrangement, water and material recycle, and maximum energetic and economic vitality. Appropriate Environmental Technology The program of the National Science Foundation that was called Appropriate Technology set up this workshop to develop suggestions on the state of knowledge and research needs on Environmental Technology. Appropriate Technology of Environment may be another phraseology for the patterns of humanity and nature, which are workable because they maximize good energy and material use, are stable in the sense of successfully continuing, and vital in organizing spatial and temporal patterns for economic vitality. Economic vitality has different requirements in growth than in periods without growth and these need to be understood. The Patterns of Regression Because growth of patterns of humanity has occurred for centuries, we are unaccustomed to considering reversal of growth and trends towards a lower energy realm, even though thoughtful scientists have anticipated and predicted these changes for many decades. We don't even have a good word for a period of decreased energy flow and structure. Perhaps "regression" could be used. There are many models for regression in smaller ecological systems and other natural phenomena, but the nature of regressing systems at the level of the human environmental system is little studied. A major research need is to study the way decreasing reserves of fuels and material resources causes changes in the networks, the technology, the energy priorities, spatial patterns, etc. For example, the ratio of land uses shifts from that of a cash economy with a few types to a diversified one with more local use than long range transport with increasing energy cost. Organization is less built around transportation but vice versa; that is, transportation is fitted to utilize environmental values better. In a basic science, the ways energy generates