Read here. The IPCC, its climate models, and the 'Al Gores' of the world have boldly predicted that human-caused global warming would result in a greater quantity of wildfires, including forest fires. The actual empirical evidence, however, does not support that prediction, rather it refutes it.
The huge geographic area of Canada and the United States has actually experienced a decline in the number of wildfires since 1970, during the time of greatest modern warming. The chart below shows the count of U.S. wildfires on the left y-axis and the right axis represents Canadian forest fires.
So far in 2011(mid-June 2011), the number of U.S. wildland fires indicate an annual total near the average for the last 10 years.
Note: Wildland fires include all those fire incidents taking place in countryside or wilderness area.