According to the National Park Service, nearly 85% of wildland fires in the United States are caused by humans. This is consistent with a study published in the Proceedings of the National Academy of Sciences, which found that 84% of the blazes that firefighters were called to fight between 1992 and 2012 were ignited by people. Another source, the National Interagency Fire Center, reports that in 2022, human-caused fires accounted for 96% of the total number of fires and 44% of the total area burned. Therefore, it can be concluded that the percentage of fires caused by humans varies from year to year, but it is consistently high, ranging from 84% to 96%.