Fire Zone
Millions of acres are being consumed each year, so what's being done to save them?
By David Johnson and Mark Zurlo
Of all nature's disasters, forest fires are often considered the most frightening. Moving at lightning speed, giant walls of flames can burn acres of land in just a few minutes. And although technology, including the use of fire-retardant chemicals, has greatly aided the fight against forest fires, they still take an enormous toll.
According to the National Interagency Fire Center, the 2006 fire season was the worst on record in terms of the number of fires and acres burned. There were 96,385 fires and 9,873,429 acres affected by fire in a year that was 125% more destructive than the 10-year average. These fires cost the federal government $1.5 billion to fight, and this figure does not include the money spent by local and state governments as part of the effort. The 2007 fire season wasn't much better than 2006, with 85,705 fires that consumed 9,328,045 acres.
Western states such as California, Colorado, and Alaska have proven to be breeding grounds for wildfire throughout the past decade. It is estimated that two-thirds of forest fires are started accidentally by people, almost one quarter are intentionally set, while lightning causes 10%.
Beneficial Fires
Forest fires can have beneficial effects. Charcoal enriches soil, and some plant species flourish in the wake of conflagrations. The cones of the jack pine tree, for instance, will not release their seeds unless exposed to intense heat. Sequoia or Douglas fir trees grow best in open sunlight areas, such as those cleared by fire.
Natural fires also remove dead wood and tangled brush.
For these reasons, the Forest Service of the U.S. Department of Agriculture, which administers 17% of all U.S. forest reserves, often allows fires, especially when started by lightning, to burn in carefully monitored areas.
Western Population Boom
As people move out of urban areas and closer to nature, they are sometimes putting themselves in the path of potential forest fires. Especially in dry western states, individual homes and even whole towns are increasingly threatened by nearby forest fires.
Twenty-five thousand acres in New Mexico's Sangre de Cristo Mountains were charred in 2000. The fire moved so fast, it burned 6,500 acres on one day, while the next it expanded to cover 23,500 acres. Another fire destroyed 45,000 acres and threatened the Los Alamos National Laboratory nuclear facility.
Satellites to the Rescue
Canadian fire fighters have tested an advanced satellite system designed to fight forest fires. Known as REMSAT (Real Time Emergency Management Via Satellite,) the system features a large blue box with a satellite dish attached to it. The system is especially valuable when electricity has been cut off.
When a forest fire breaks out, the box can be taken to the front lines or, if necessary, dropped from a helicopter. Three satellites communicate with the box, which can transmit detailed pictures of the blaze, pinpoint the exact location of fire fighters to the command center, and enable crews to exchange text messages.
In tests conducted in British Columbia, Canadian fire fighters set a house on fire and used smoke bombs to simulate a major fire similar to the one that threatened Los Alamos.
Pruning Dead Wood
Other fire prevention methods are less high tech and more natural. In 2003, the U.S. Forest Service worked with timber companies to cull out smaller trees and dense undergrowth on 18,000 acres of Colorado forest, not far from areas damaged by that year's raging fires.
More space between trees makes it harder for fires to jump from tree to tree. In addition, grasses, wildflowers, and other natural vegetation are less fire-prone than the dense brush that tends to grow in protected forests.
Scientists also say that fewer trees in an area can inhibit the spread of disease and enhance the probabilities that trees will survive droughts, when competition for water increases.
Sources: National Interagency Fire Center, CNN, ABC, Columbia Encyclopedia
Information Please® Database, © 2007 Pearson Education, Inc. All rights reserved.
