Anthropogenic climate change has led to warmer and drier conditions  that favour wildland fires in North America  . In response, increased burned area in recent decades in western North America has been facilitated by anthropogenic climate change . Annual numbers of large wildland fires and area burned have risen in the past several decades in the western USA , and area burned has increased in Canada  . Attribution studies have reported that climate change increased burned area in Canada   as well as the western USA   and California  . Decreased precipitation was the primary climate-change cause of increased burned area in the western USA, with warming a secondary influence , whereas warming  was most important in a California study . A drier atmosphere  has been linked to climate change through altered large-scale atmospheric circulation, which then facilitated greater burned area in the western USA . Through anomalous warm and dry conditions, anthropogenic climate change contributed to the extreme fires of 2016  in western Canada and the extreme fire season in 2015 in Alaska . These studies did not include human activities that influence fire-climate relationships .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report