Investigations Point to Arson and Utility Failures as Primary Drivers of Major Wildfires

Authorities and court records show most destructive U.S. wildfires are linked to human actions such as arson and power line failures, rather than climate factors.

By yourNEWS Media Newsroom

Human activity — including arson and utility equipment failures — has been identified as the dominant cause of the most destructive wildfires in California and across the United States, according to investigators, prosecutors, and national fire data, challenging claims that climate change is the primary driver behind recent catastrophic blazes.

One year ago, California’s deadly Palisades wildfire tore through Los Angeles County, killing 12 people and burning for weeks before being fully extinguished. Authorities later charged Justin Rinderknecht with allegedly igniting the fire by rolling a burning vehicle into brushland. The case marked another instance in which investigators attributed a major wildfire to deliberate human action rather than environmental conditions.

Climate change has frequently been cited by political leaders as the central explanation for California’s wildfire activity over the past three decades. Investigative journalist Sharyl Attkisson reported that the most significant causes of major fires are instead arson and power companies, citing law enforcement findings and court records in an analysis published here.

In 2024, California Sen. Adam Schiff said addressing climate change was essential to solving the state’s wildfire problem, stating during a candidate forum that, “First and foremost, we have to address climate change,” according to coverage here.

Similarly, in 2020, then-House Speaker Nancy Pelosi said, “Mother Earth is angry. She’s telling us with hurricanes on the Gulf Coast, fires in the West, whatever it is … The denial of the science of climate change is something that some people are going to have to answer to their children and grandchildren for,” in remarks posted here.

Prosecutors who have handled major wildfire cases, however, point to direct mechanical and human failures as the immediate causes. Few officials are more familiar with that record than Mike Ramsey, who led the prosecution of PG&E for starting the 2018 Camp Fire — the deadliest and most destructive wildfire in California history.

“In the late nineties, we noticed a number of fires were being caused by PG&E failure to clear vegetation around their lines. Trees and high-powered lines don’t mix very well,” Ramsey said during an interview on Full Measure.

Investigators determined that the Camp Fire was sparked by a PG&E transmission line that had not been properly maintained for decades. As the fire burned, authorities identified a failed arm on a transmission tower that allowed a power line to fall into surrounding brush.

“They looked up into the tower and could see that an arm had come down and that had most likely started the fire. Next day they called me and said, ‘It looks like this is a PG&E-caused fire,’” Ramsey said. “As it turns out that it was decades of negligent maintenance and obviously criminally negligent maintenance that came about. The hook that failed had been in that location for, we figured, 98 years.”

The failure involved a worn “C” hook that supported a 115,000-volt power line, which dropped into dry grass and ignited the fire. In 2019, PG&E pleaded guilty to 84 counts of involuntary manslaughter and agreed to a $13.5 billion settlement for victims, along with $522 million paid to Butte County and the town of Paradise.

Utility-related ignitions have not been isolated to PG&E. Authorities have also faulted Southern California Edison for sparking additional deadly fires in the state.

Arson remains another significant contributor. California’s 2024 Park Fire, the largest arson-ignited wildfire in state history, burned nearly 430,000 acres. Authorities allege it was started by Ronnie Stout, a convicted child sex offender accused of pushing a burning car into a gully.

The pattern extends beyond California. National fire data show that roughly 85 percent of U.S. wildfires are human-caused, resulting from arson, accidents, and equipment failures rather than natural ignition sources.

Investigators and prosecutors involved in major wildfire cases continue to emphasize that while environmental conditions may influence fire behavior, the initial ignition of the most destructive blazes is overwhelmingly linked to direct human actions.