National park environments are characterized by dynamic landscapes. Tides ebb and surge along shifting coastlines. Wildfires and diseases invade forests. Wind and water erode historic structures. Plant populations adapt, animals migrate to survive, and humans adjust. However, a rapidly changing climate is triggering even more alterations, forcing cautious confrontation and thoughtful response.Careful stewardship of natural and cultural resources is being challenged by the accelerated rate at which scientific information must be acquired, understood, and conveyed.