A large fire tearing through Holy Jim Canyon in California that has charred more than 6,200 acres so far has a familiar origin. Though not always intentional or criminal, humans are the most common cause of wildfires in the United States.



Earlier this week, a man named Forrest Clark was arrested in connection to the Holy Fire, the name given to a group of several different wildfires that have blazed through forests in southern California. It's the second such arrest this summer.

“The probability of fires is increasing because people are increasing,” Jon Keeley from the U.S. Geological Survey told National Geographic in 2014.



His predictions have proven true year over year as fires have