5 myths about wildfires
Northern California’s burning. Oregon’s ablaze. Three firefighters died in Washington last week while trying to keep flames from razing the entire town of Twisp. With weeks of fire season still to go, the federal government has already spent more than $800 million trying to extinguish blazes that promise to rival history’s worst in terms of size, destructiveness and cost. In other words: same sad stories, new year. This weekend, while the American West glows that weird and terrifying orange of the fire season, consider that it may only look like the apocalypse. And maybe we’re just thinking about wildfires in the wrong ways.
1. Technology has changed the way we fight fires.
Air tankers dropping 11,000-gallon payloads of blood-red fire retardant on flames look great on the nightly news. So do drones mapping a fire’s active edges with infrared cameras. But the boots-on-the-ground work of stopping fires has changed little since 1910, when America started its grand experiment to remove wildfires from forests. That year, a blaze called the Big Burn scorched 3 million acres of prime timber across Idaho’s panhandle and into Montana, infuriating the U.S. Forest Service, whose income relied on leasing public lands to timber barons who wanted only green trees. In the wake of the Big Burn, the agency dedicated itself to dousing every spark in the forest. It cobbled together troops of young men and handed out shovels, axes and orders to clear flammable material around the perimeter of wildfires. Without fuel to burn, the fires stopped.
Over the next century, the agency modernized firefighting with surplus World War II equipment, including jeeps, helicopters and parachutes for smokejumpers. But the most effective weapon in the increasingly sophisticated arsenal remains the many thousands of young men and women who, each year, spend their summers removing flammable materials around wildfires with chainsaws and hand-held tools. So far, no technology has been able to replace human judgment and dexterity when it comes to culling potential kindling. “The fact of the matter remains you still have to engage the fire, and that means going in and building lines, often by hand,” says fire researcher Jim Cook.
2. Fires are bigger now than at any point in history.
It’s true that between 4 million and 10 million acres of forest burn each year, 40 percent more acreage than just 40 years ago. But today’s fire seasons - and even individual fires - are actually smaller than the historic norm. Before the 20th century, almost 30 million acres burned every year. The single biggest U.S. wildfire of the past 50 years, Arizona’s 2011 Wallow Fire, burned a whopping 500,000 acres, but there were at least five fires in the 19th century that blackened twice that many acres. Three of those were larger by a factor of five.
What’s different about today’s fires is the intensity with which they’re burning. One reason is that fire suppression has changed Western forests. Take the ponderosa stands of the Southwest: Historically, low-intensity blazes, ignited by lightning or indigenous peoples, burned every five to 10 years, thinning the forest of young saplings and brush and leaving just 150 large trees per acre. Today, in the absence of flames, those stands are choked with as many as 1,200 trees per acre - too thick to walk through without risking a branch in your eye.
Another reason is the warming climate. The average annual temperature is 1.7 degrees higher than the 20th-century average, and by the end of this century that number is forecast to climb an additional four to six degrees. The extra heat wicks water away from plants, drying them out and priming the forests for fire.
Scientists call the resulting breed of blaze “megafires,” which burn so intensely that firefighters have little hope of containing them. A few examples include Colorado’s 2012 Waldo Canyon Fire, which burned about 350 homes in Colorado Springs; the 2013 Yarnell Hill Fire, which torched 130 homes and killed 19 firefighters outside a small Arizona town; and New Mexico’s 2011 Las Conchas Fire, which burned about an acre of mature pines every second for 14 hours straight.
3. More firefighters and more air tankers can control wildfires
Last year, Agriculture Secretary Tom Vilsack announced a larger firefighting fleet and an increased budget ($2.2 billion, up from $2.1 billion the year prior) for the Forest Service. California Gov. Jerry Brown has called for thousands of additional firefighters. Colorado has invested significant resources in a new aerial fleet, with a stated intent to suppress all blazes of a particular size.
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