On average, wildfires burn six times the acreage they did 40 years ago, while the annual number of wildfires over 1,000 acres has doubled from 50 during an average year in the 1970s to more than 100 each year since 2002, Climate Central research shows. (scientificamerican.com)
In the western US overall, the average annual number of wildfires that are bigger than 1,000 acres has more than doubled since 1970, according to Climate Central. (businessinsider.com)
Since 1970, the annual average number of wildfires larger than 1,000 acres has more than doubled in the western U.S.. (wxshift.com)