You want some how and why read the article linked below
here's a part of it
It’s true. At least two decades ago—perhaps as long as a century—fire researchers were warning that increasing atmospheric CO2 would mean bigger wildfires. History confirmed at least the latter hypothesis; using data like fire scars and tree ring sizes, researchers have shown that before Europeans came to North America, fires were relatively frequent but relatively small, and indigenous people like the Pueblo used lots of wood for fuel and small-diameter trees for construction. When the Spaniards arrived, spreading disease and forcing people out of their villages, the population crashed by perhaps as much as 90 percent and the forests went back to their natural fire pattern—less frequent, low intensity, and widespread. By the late 19th century, the land changed to livestock grazing and its users had no tolerance for fire at all.
“So in the late 20th and early 21st century, with these hot droughts, fires are ripping now with a severity and ferocity that’s unprecedented,” says Tom Swetnam, a dendrochronologist who did a lot of that tree-ring work. A fire in the Jemez Mountains Swetnam studies burned 40,000 acres in 12 hours, a “horizontal roll vortex fire” that had two wind-driven counter-rotating vortices of flame. “That thing left a canopy hole with no trees over 30,000 acres. A giant hole with no trees,” he says. “There’s no archaeological evidence of that happening in at least 500 years.”
https://www.wired.com/story/the-only...ill-get-worse/