Glenn Helkenn lives in a spruce forest, in a tiny log cabin he built himself on the outskirts of Fairbanks, Alaska’s third largest city. Give him an hour and a handsaw and Helkenn says he can harvest enough firewood to heat his 96 sq ft home for a couple of days, even when the temperature drops to -40F. For him, it’s about more than free fuel. “It is what I enjoy doing,” Helkenn said. “You know, it’s the fresh air. It’s the time out in the.