People are behind costly, increasing risk of wildfire to millions of
homes

Date:
September 10, 2020
Source:
University of Colorado at Boulder
Summary:
People are starting almost all the wildfires that threaten
US homes, according to an innovative new analysis combining
housing and wildfire data. Through activities like debris burning,
equipment use and arson, humans were responsible for igniting 97%
of home-threatening wildfires, researchers report.



FULL STORY ========================================================================== People are starting almost all the wildfires that threaten U.S. homes, according to an innovative new analysis combining housing and wildfire
data.

Through activities like debris burning, equipment use and arson,
humans were responsible for igniting 97% of home-threatening wildfires,
a University of Colorado Boulder-led team reported this week in the
journal Fire.


========================================================================== Moreover, one million homes sat within the boundaries of wildfires in the
last 24 years, the team found. That's five times previous estimates, which
did not consider the damage done and threatened by small fires. Nearly 59 million more homes in the wildland-urban interface lay within a kilometer
of fires.

"We have vastly underestimated the wildfire risk to our homes," said
lead author Nathan Mietkiewicz, who led the research as a postdoc in
Earth Lab, part of CIRES at the University of Colorado Boulder. "We've
been living with wildfire risk that we haven't fully understood."
To better understand wildfire trends in the United States, Mietkiewicz,
now an analyst at the National Ecological Observatory Network, and his colleagues dug into 1.6 million government spatial records of wildfire
ignition between 1992 and 2015; Earth Lab's own compilation of 120,000
incident reports; and 200 million housing records from a real estate
database from Zillow.

Among their findings:
* Humans caused 97% of all wildfires in the wildland-urban interface,
85%
of all wildfires in "very-low-density housing" areas, and 59%
of all wildfires in wildlands between 1992 and 2015.

* Human-started wildfires are expensive, eating up about one-third
of all
firefighting costs.

* Overall, about half of fire suppression costs were related to
protecting
houses in all locations: the wildland-urban interface, low-density
housing areas, and elsewhere.

* Most human-caused wildfires were relatively small (<4 km2) but were
responsible for most homes threatened (92%).

* The wildland-urban interface or "WUI," represented only 10% of
U.S. land
in 2010, but was the site of 32% of all wildfire ignitions.

* The WUI is also expanding our vulnerability, between 1992 and
2015, we
built 32 million new homes in the WUI.

"Our fire problem is not going away anytime soon," said co-author
Jennifer Balch, director of Earth Lab, a CIRES Fellow, and associate
professor of geography. It's not just that we're building more homes
in the line of fire, she said, but climate change is creating warmer,
drier conditions that make communities more vulnerable to wildfire.

The new study, she said, does provide guidance for policy makers. "This provides greater justification that prescribed burns, where safe, can
mitigate the risk and threat of future wildfires," Balch said. And we
need to construct more fireproof homes in these beautiful, but flammable landscapes, she added.

"We essentially need to build better and burn better." "Smokey Bear
needs to move to the suburbs," Mietkiewicz concluded. "If we can reduce
the number of human-caused ignitions, we will also reduce the amount of
homes threatened by wildfires."

========================================================================== Story Source: Materials provided by
University_of_Colorado_at_Boulder. Note: Content may be edited for style
and length.


========================================================================== Journal Reference:
1. Nathan Mietkiewicz, Jennifer K. Balch, Tania Schoennagel, Stefan
Leyk,
Lise A. St. Denis, Bethany A. Bradley. In the Line of Fire:
Consequences of Human-Ignited Wildfires to Homes in the
U.S. (1992-2015). Fire, 2020; 3 (3): 50 DOI: 10.3390/fire3030050 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/09/200910130410.htm

--- up 2 weeks, 3 days, 6 hours, 50 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1337:3/111)