Minnesota Public Radio: A University of Minnesota forestry expert says global warming and other stressors will dramatically change the state’s northern forests, leaving much of the state a prairie. Lee Frelich said it’s not just the higher temperatures and drought, it’s also more straight-line wind storms, fires, the booming deer population, and plagues of pests both native and exotic. They’ll all push the range of balsams and birches as much as 300 miles north. Frelich’s predictions appear in the …