Wildfires have become a common occurrence in California, and a new study published in the International Journal of Wildland Fire suggests that humans have played a significant role in igniting these blazes.
Researchers from 15 universities, including UCLA, investigated wildfire data from 1980 to 2020 and concluded that wildfires have become larger and more destructive due to factors such as climate change, fuels left in forests, and ignition sources.
Lead author of the study, Glen MacDonald, a geography professor at UCLA, stated that over 90% of wildfire ignition sources in California have been traced back to human activities. These activities range from careless disposal of cigarettes to improper handling of machinery that can cause sparks. Accidental ignition, such as failing to extinguish campfires, can also start wildfires, particularly in conditions of dry vegetation and high temperatures.
While factors such as arson and weather patterns like high winds or lightning strikes also contribute to wildfires, MacDonald emphasized that the increase in wildfire intensity cannot solely be attributed to climate change. Local ecosystems, human habits, previous forecast management practices, and the accumulation of fuel in forest areas are additional factors that have intensified wildfires.
One proposed solution to reduce intense wildfires is to let natural fires burn. MacDonald explained that many vegetation types in California are adapted to fire, and suppressing these natural fires can lead to fuel buildup over time. With the current drier and warmer climate, this accumulated fuel can facilitate easier ignition, leading to more intense and larger fires.
For California residents and governmental leaders to mitigate wildfire intensity and prevent them from starting, MacDonald suggests increasing resources for Cal Fire and fuel management personnel. Furthermore, residents can contribute by being more mindful while enjoying nature.