The vastly forested Ozarks region is the subject of computer model analysis over the effects of climate change. Forecasts range in their predictions: one suggests that the oak and hickory that dominate the forest will be replaced by pines, while another says the forest could evolve into savanna or even grassland. Regardless of the outcome, "I certainly would expect forests to change," said John Shannon, state forester with the Arkansas Forestry Commission and a technical adviser to the Arkansas Governor's Commission on Global Warming.