Includes bibliographical references.

"Nearly one-third of the United States is covered by forests, accounting for more than one million square miles, an area exceeded only in Canada, Brazil, and Russia. These forest ecosystems play vital roles in carbon storage, nutrient cycling, and air and water purification, as well as in supplying habitat for wildlife. Forests hold historical, cultural, and social significance for Americans and are sources of both food and fiber. Today, these valued resources are endangered as never before. Global commerce has hastened the introduction of nonnative, invasive tree pests and diseases, and those native to the country are becoming more virulent due to external drivers such as climate change. The loss of a tree species can have cascading adverse effects on the forest ecosystem and on the range of services it provides and the values it represents to human populations"--Preface. Forest health -- Mitigating threats to forest health -- Ecological, economic, social, and ethical considerations in the use of biotechnology in forest trees -- An integrated impact assessment framework -- Current regulatory system for biotech trees and other methods used to address forest health -- Moving ahead.