Bark beetles reduced thousands of the trees to brown skeletons; wildfires blackened others. And some of the remaining healthy ponderosa pines in and around Prescott may soon be gone, too.The U.S. Forest Service wants to thin about 34,000 acres of forested land beginning this summer to reduce the risk of catastrophic wildfires. The thinning is expected to reduce fuel, improve tree diversity and general forest health on about 28,850 acres of national forest land and 5,179 acres of private land over the next 10 years. "They have to do something to keep the town from burning down," resident Ray...