In the long-awaited new edition of the bestseller Environmental Interpretation, Sam H. Ham captures what has changed in our understanding of interpretation during the past two decades. Ham draws upon recent advances in communication research to unveil a fresh perspective that will lead interpreters to new and insightful pathways for making a difference through their work. Sam H. Ham, PhD, is director of the Center for International Training and Outreach and professor of communication psychology in the University of Idaho's Department of Conservation Social Sciences. Ham is the author of nearly four hundred publications and has won several awards.