Cretaceous-Tertiary Mass Extinctions: Biotic and Environmental Changes is a fascinating new study that combines the most current research on mass extinction with the theoretical perspectives of the leaders in the field. In twenty engaging essays, more than thirty leading paleobiologists and paleontologists uncover a wealth of data from the fossil record about changes in species survival and physical environments across the Cretaceous-Tertiary (K/T) boundary. Together these papers present a much-awaited global perspective on the bilogical and environmental changes taking place during this critical period in the history of life. Anyone interested in the K/T boundary controversy and how research scientists interpret the relationship between climate change and mass extinction will find this work essential.