Support WBURWhat's The Leading Cause Of Wildfires In The U.S.? HumansPlay02:55Download AudioChristopher JoyceFebruary 27, 2017 ShareMore than 10 wildfires burned over 200,000 acres in Southern California in October 2003, many of them started by humans. This satellite image shows strong winds carrying smoke over the Pacific. (MODIS Rapid Response Team/NASA)
