…Over several days in September 2010, the Fourmile Canyon Fire ripped through the suburban forests outside of Boulder, Colo. It burned a mere 6,181 acres, small by today’s standards, yet the fire was also costly. That’s in part because the flames focused on a section of wildland urban interface that was scattered with homes. According to a study by Headwaters Economics, Boulder County has one of the most heavily developed WUIs in the country, and fighting fires in such areas is far more costly than in undeveloped forests…