Figures 1-4 present results of the National Institute for Global Environmental Change Midwestern Regional Centerfunded research designed to model the effect of carbon dioxide-induced climate change on fifty-seven tree species in the five-state Midwestern Great Lakes region. Here, possible effects on shagbark hickory (Carya ovata) in Indiana are displayed. Figure 1 shows forested areas for Indiana in 1981. Figure 2 depicts the initial shagbark hickory population. Model predictions of this species' population in the year 2060 in an unchanged environment are presented in Figure 3. Figure 4 shows the species' population in the same area in an altered climate. This research project was directed by J. C. Randolph, Professor of Public and Enivornmental Affairs, Indiana University Bloomington.