About the Author

Nelson was one of the eight-person crew in the 2 year closure experiment in Biosphere 2, 1991-93. He is Chairman of the Institute of Ecotechnics, and one of its founding directors and Associate Editor of Advances in Space Research journal. Head of Wastewater Gardens International and a vice-chair of the closed ecological system section of COSPAR (the Intl. Committee of Space), he resides in Santa Fe, New Mexico.