According to the US Government National Interagency Fire Center, US wildfires occur half as often as they did 50 years ago. The 1970s (ice age scare) had a huge number of fires.
The IPCC predicted the exact opposite :
15.2.2.1.3. Fire
global warming also may increase fire frequency
In 1939, the US had a forest fire every three minutes.


I would be leery of this data, as there is a sharp step change 1982-1983 for the number of fires.
I also have trouble with the number of fires decreasing, but acreage increasing.