Technical Bulletin No. 0690: Global Change and Forest Responses: Theoretical Basis, Projections, and Uncertainties
Over the last two centuries, atmospheric concentrations of carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons (CFCS) have increased due to human activity. Potential effects of these changes on global climate are uncertain. Global climate model scenarios based on the greenhouse theory project higher mean global temperatures, changes in amounts and distribution of precipitation, and increased frequency and intensity of disturbance events.