Associated Press: Big changes are in store for the nation's forests as global warming increases wildfires and insect infestations, and generates more frequent floods and droughts, the U.S. Department of Agriculture warns in a new report. The study released Tuesday is part of the National Climate Assessment and will serve as a roadmap for managing national forests across the country in coming years. It says the area burned by wildfires is expected to at least double over the next 25 years, and insect infestations...