Wildfire embers are the main cause of homes igniting

HN commenters cite it as a source for the research showing that simple home-ignition-zone measures raise a house's chance of surviving a wildfire.

NFPA video in which wildfire researcher Jack Cohen explains that embers (firebrands), not the flame front, are the main cause of homes igniting in wildfires. He shows how landscaping and removing debris around the home reduce risk.