Thomas E. Graedel is Clifton R. Musser Professor of Industrial Ecology, Professor of Chemical Engineering, Professor of Geology and Geophysics, and Director of the Center for Industrial Ecology at Yale University. He is the author of Streamlined Life-Cycle Assessment and lead author or coauthor of a number of other books.
Braden R. Allenby is Founding Director of the Center for Earth Systems Engineering andManagement, Lincoln Professor of Engineering and Ethics, and Professor of Civil and EnvironmentalEngineering at Arizona State University. He is the author of Reconstructing Earth:Technology and Environment in the Age of Humans.