National Geographic: This summer, eye-watering smoke hung over much of the western United States, and flames threatened homes, towns, and even the giant sequoias of Kings Canyon National Park. By mid-November, wildfires had burned 9.8 million acres across the country, and 2015 was on track to become the biggest fire year in at least a decade. Rising temperatures, drought, and dense forests created by decades of fire suppression are contributing to larger, faster-moving wildfires. And as more people move into the woods,...