See reply 33 (probably the one above this post).
Alaska tundra fires and taiga fires are an annual thing and are pretty much ignored unless they threaten a [legal] cabin. A 100,000 acres fire is an everyday occurrence. If they have burnt 400,000 acres in Arizona it's a big deal to the locals, but overall it isn't all that unusual.
Also, interesting they would use petagrams sometimes rather than tons in their data. Makes bigger numbers. Like measuring produced oil in barrels and spilled oil in gallons. Makes one immediately suspect the motives.