Well, the Fire-to-beat-them-all as of now is the California Rim fire near Yosemite National Park.
It has now gotten so large - over 300 miles
2 / 777 km
2 - and so out of hand that it is not only having huge effects on the ground, but is now having
planet-wide side-effects!
Enlarge the second image down in the "Images" pane on the right. See that red plume to the far left? That's the carbon monoxide "fallout" from the Rim fire....
(While your at it, take a look at where the huge concentrations of carbon monoxide are world-wide to see who needs to get their "Global Warming Gas" act together ASAP....
)
P.S. I don't think it's been mentioned yet, but this fire is potentially on its way further north into the Sierra Nevada Mountains, and is already threatening the hydroelectric power stations and fresh water supply basins
* that provide nearly all of the water and power for the greater San Francisco Bay area. (Including yours truly!
)
* There is already some danger to the water supply due to the higher acidity of the water as a result of ash fall in the reservoirs. Turbidity levels are NOT affected yet, however.... The water system folks have already enacted emergency status as a precaution.[Excerpt from NBC Bay Area news report:
"As the Rim fire continued its march across Yosemite, flames began to increasingly bear down on the Hetch Hetchy Reservoir, the source of water for 2.6 million people in the Bay Area.
Officials with San Franciscos Public Utilities Commission said the blaze had moved within 300 yards of the reservoir and was raining ash onto the water.
We have visual confirmation that ash has been landing on top of the reservoir, said Tye Jue, spokesman with the SFPUC. But we draw our water about 260 feet below the surface of the water, so the ash has not really entered the system.
Water managers werent sounding the alarm. They said monitors along the 459 mile system showed turbidity levels [remain] at .2 .]NOT good if this continues for very long tho! 
