In 2015, the Lake Fire burned 31,000 acres in this popular hiking forest northeast of Los Angeles. It destroyed four buildings, came perilously close to the resort town of Big Bear Lake and took more than 1,900 firefighters five days to contain at a cost of almost $40 million.
Click here for original story, Fighting fire with fire: Controlled burns remain essential as US wildfires intensify
Source: Phys.org