Lisa Heschong, a California architect with the Heschong Mahone Group, which specializes in research on building performance, doesn’t think much of firelight: “The use of fire for lighting, while romantic, is extraordinarily inefficient, energy intensive, and potentially polluting. Indoor combustion is one of the main sources of indoor air pollution, especially in the third world.” Cities like Sacramento, California, even limit wood-burning fireplaces to keep skies clearer. “In our climate,” Heschong explains, ”the presence of smoke in the winter increases the prevalence of soot, thereby reducing daylight.”