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Western wildfires destroyed 246% more homes and buildings over the past decade – fire scientists explain what's changing

Jennifer Balch, Associate Professor of Geography and Director, Earth Lab, University of Colorado Boulder, Natasha Stavros, Director of the Earth Lab Analytics Hub, University of Colorado Boulder, Philip Higuera, Professor of Fire Ecology, University of Montana, and Maxwell Cook, Ph.D. Student, Dept. of Geography, University of Colorado Boulder, The Conversation on

Published in Science & Technology News

This is important because wildfires started by human activities or infrastructure have vastly different impacts and characteristics that can make them more destructive.

Unplanned human ignitions typically occur near buildings and tend to burn in grasses that dry out easily and burn quickly. And people have built more homes and buildings in areas surrounded by flammable vegetation, with the number of structures up by 40% over the past two decades across the West, with every state contributing to the trend.

Human-caused wildfires also expand the fire season beyond the summer months when lightning is most common, and they are particularly destructive during late summer and fall when they overlap with periods of high winds.

As a result, of all the wildfires that destroy structures in the West, human-caused events typically destroy over 10 times more structures for every square mile burned, compared to lighting-caused events.

The December 2021 Marshall Fire that destroyed more than 1,000 homes and buildings in the suburbs near Boulder, Colorado, fit this pattern to a T. Powerful winds sent the fire racing through neighborhoods and vegetation that was unusually dry for late December.

As human-caused climate change leaves vegetation more flammable later into each year, the consequences of accidental ignitions are magnified.

 

This might make it easy to think that if we just put out all fires, we would be safer. Yet a focus on stopping wildfires at all costs is, in part, what got the West into its current predicament. Fire risks just accumulate for the future.

The amount of flammable vegetation has increased in many regions because of an absence of burning due to emphasizing fire suppression, preventing Indigenous fire stewardship and a fear of fire in any context, well exemplified by Smokey Bear. Putting out every fire quickly removes the positive, beneficial effects of fires in Western ecosystems, including clearing away hazardous fuels so future fires burn less intensely.

The good news is that people have the ability to affect change, now. Preventing wildfire disasters necessarily means minimizing unplanned human-related ignitions. And it requires more than Smokey Bear’s message that “only you can prevent forest fires.” Infrastructure, like downed power lines, has caused some of the deadliest wildfires in recent years.

Reducing wildfire risks across communities, states and regions requires transformative changes beyond individual actions. We need innovative approaches and perspectives for how we build, provide power and manage lands, as well as mechanisms that ensure changes work across socioeconomic levels.

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