Forest fires are well known for their ferocity. They accounted for just 33 percent of houses destroyed by wildfires in the early 2000s, however, the study authors found after analyzing the locations of homes within wildfire perimeters since the 1990s. In contrast, 64 percent of such houses were destroyed by grassland or shrubland fires. This is because even though forest fires are particularly destructive to buildings, much more of the area burned in the U.S. is made up of grasslands and shrublands, says the study’s first author Volker Radeloff, an ecologist at the University of Wisconsin–Madison. “We had a hunch,” he says, “but the actual numbers surprised us.”
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