This file was created by scanning the printed publication. Errors identified by the software have been corrected; however, some errors may remain. Keynote Speech 1 Robert Lewis Jr.2 Governor Cardenas, and esteemed colleagues of Mexico, Canada, United States, and other parts ofthe world. It is my great honor to represent the USDA Forest Service during this North American Science Symposium on ''Toward a Unified Framework for Inventorying aitd Monitoring Forest Ecosystem Resources." I bring you warm greetings from Mike Dombeck, the Chief of the U.S. Forest Service. Mr. Dombeck extends his apologies that he cannot be present with us on the occasion ofthis important scientific event. This Science Symposium is of special significance for the USDA Forest Service as well as for other U.S. Land Management Agencies which have active research and operational programs for inventorying and monitoring terrestrial ecosystems. The exchange of scientific information and experiences that will take place in this meeting is also of major significance for the NAFTA countries since our nations need to know the status of their ecological systems, soil, water, plants and animals, water and air; and ifthey are changing, why and how that change is taking place. In this important meeting, scientist from our respective institutions will address the issues of drivers of change as well as scientifically based approaches to: • Understanding and reporting on the status and trends in ecosystem condition; • Describing emerging ecological problems; . • Aiding in the design of ecosystem management activities; • Evaluating ecosystem management programs in terms of their performance; and • Responding to ecologicai emergencies. Central to the goal for this Symposium is to build on the best science and technology available to assure that the data and information produced in future inventory and monitoring programs are comparable, quality assured, available, and adequate for their intended purposes, thereby providing a reliable framework to support informed and responsible decision making. Please let me emphasize that the USDA Forest Service views this ''North American Science Symposium" as an important integrating mechanism for carrying out and advancing many of our responsibilities. While our forests are Ipaper presented at the North American Science Symposium: Toward a Unified Framework for Inventorying and Monitoring Forest Ecosystem Resources, Guadalajara, Mexico, November 1-6,1998. 2Robert Lewis Jr. is Deputy Chief, Research and Development,USDA Forest Service, Washington, DC. USDA Forest Service Proceedings RMRS-P-12. 1999 generally healthy, we know that past and/or current management practices, and change in our global ecological systems, have increased the risk of catastrophic wildfires, and increased the severity of drought, insect infestation and disease. Our nations face serious forest ecosystem health problems, and therefore, ecosystem management practices need to be improved based on the best available scientific data and information produced by our research monitoring and inventory programs. Also, the relationship between the well-being of people and the healthy condition of ecological systems is critical to the future of human society. Simply put, people's needs cannot be met if the health of our ecological systems is not secured. Understanding this complexity constitutes one of the most fundamental challenges society and governments face today and into the twenty-first century. In this Symposium, scientists, resource managers, and a variety of experts from North America and other parts of the world will address the complexity of these issues and the scientific approaches needed to confront them. As our economic systems become more interdependent and global, understanding the vulnerability of ecological systems to the different drivers of change is fundamental to insuring their sustained productivity and societal value. Sustaining the health of ecological systems, and particularly, managing and mitigating change in those that have already been damaged, are also among the most critical issues and challenges governments and societies face today and in the foreseeable future. Because the complexity of these issues transcends national boundaries, the collective environmental and economic performance of our countries becomes an essential condition for achieving and securing the sustain ability of ecosystems. Various international mechanisms and protocols have been developed to address the complexity ofthese issues. In particular, the USDA Forest Service has been working internationally to address these concerns. As in many other related cooperative undertakings, sponsoring this Symposium in partnership with federal agencies of Canada and Mexico is a clear example of our international commitment to ecosystem sustainability for generations to come. In closing, there is much to be encouraged about in the progress made so far by our respective agencies since our 1995 Science Meeting on ''Monitoring for Ecological Assessment of Terrestrial and Aquatic Ecosystems" held in Mexico City. There is an openness in diplomacy among our governments for cooperation in many sectors. Thank you for hosting this Symposium in the beautiful City of Guadalajara - The Western Pearl of Mexico. I look forward to the fruits of our work in partnership.