SAN FRANCISCO — Facing down 600 wildfires in the past three days alone, emergency workers rushed to evacuate tens of thousands of people in Southern California on Thursday as a state utility said one of its major transmission lines broke near the source of the out-of-control Kincade blaze in Northern California. **SNIP** The idea that fire could itself be used to help fight fire and restore ecosystems first gained institutional acceptance in the South. In 1958 a policy change was made to allow for the first prescribed burn in a national park, at Everglades National Park in Florida. For some...