Just like any kind of fire, wildfires are caused by the presence of fuel and a spark. In the case of the 2017 fires in the wine country of California, along with the state's 2018 Camp Fire, the fuel was dry leaf litter, branches and downed trees. And the spark, in some cases, resulted from electric utility lines and, in other cases, due to contractor’s work.

More recently, this summer's Maui fires have taken hundreds of lives—deceased and missing—and burned more than 2,500 acres. Lahaina’s historic sites cannot be replaced, and estimates of the rebuild costs are near $5 billion. In Hawaii, the fuel was the same as in California: dried forest debris. It is alleged that the spark was from a powerline downed by extreme winds from Hurricane Dora. While sparks were present, it is the increased volume of fuel that has been the true source of the disastrous recent wildfires.

The increased presence of fuel is the result of recent changes in forestry-management practices, coupled with accelerated climatic shifts in recent years toward hotter, drier weather from 2011 to 2020 in California and 2022 to 2023 in Maui, increasing both frequency and severity.

Reprinted courtesy of Susan Doering, Construction Executive, a publication of Associated Builders and Contractors. All rights reserved.