Firefighters control and put out fires and respond to emergencies involving life, property, or the environment. On the scene of a fire or other emergency, firefighters' work may be dangerous. On call at fire stations, firefighters sleep, eat, and perform other duties during shifts that often last 24 hours.
The main effect of prescribed burning on the water resource is the potential for increased runoff of rainfall. When surface runoff increases after burning, it may carry suspended soil particles, dissolved inorganic nutrients, and other materials into adjacent streams and lakes reducing water quality.
The two basic steps in preventing forest fires are reducing risk and reducing hazard. Hazard is reduced by compartmentalizing a forest with firebreaks (alleyways in which all vegetation is removed) and reducing the buildup of fuel (litter, branches, fallen trees, etc.) by controlled burning.
Water cools and smothers the fire at the same time. It cools it so much that it can't burn anymore, and it smothers it so that it can't make any more of the oxygen in the air explode. You can also put out a fire by smothering it with dirt, sand, or any other covering that cuts the fire off from its oxygen source.
An average surface fire on the forest floor might have flames reaching 1 meter in height and can reach temperatures of 800°C (1,472° F) or more. Under extreme conditions a fire can give off 10,000 kilowatts or more per meter of fire front.
So, why are wildfires getting worse? Climate change is a big part of it. Summer wildfire seasons are already 40 to 80 days longer on average than they were 30 years ago. Annual droughts are more pronounced, making it easier for fuels to dry out and fires to ignite and spread.
Fire kills diseases and insects that prey on trees and provides valuable nutrients that enrich the soil. Fire kills pests and keeps the forest healthy. Vegetation that is burned by fire provides a rich source of nutrients that nourish remaining trees.
Sometimes, fires occur naturally, ignited by heat from the sun or a lightning strike. However, most wildfires are because of human carelessness such as arson, campfires, discarding lit cigarettes, not burning debris properly, playing with matches or fireworks.
2020: In 2020 there were 58,950 wildfires compared with 50,477 in 2019, according to the National Interagency Fire Center. About 10.1 million acres were burned in 2020, compared with 4.7 million acres in 2019.
During wildfires, the nutrients from dead trees are returned to the soil. The forest floor is exposed to more sunlight, allowing seedlings released by the fire to sprout and grow. Sometimes, post-wildfire landscapes will explode into thousands of flowers, in the striking phenomenon known as a superbloom.
While wind can help the fire to spread, moisture works against the fire. Moisture, in the form of humidity and precipitation, can slow the fire down and reduce its intensity. Rain and other precipitation raise the amount of moisture in fuels, which suppresses any potential wildfires from breaking out.
Strong winds can also cause power lines to spark, which can ignite wildfires if there is dry brush and grass nearby. Fires spread in hot, dry, and windy conditions. Stronger winds supply oxygen to fire, preheating the fuels in the path of the fire, and transport embers ahead of the flaming front.
