After the Great Depression, the Northwest’s faltering timber industry got its second wind. The comeback started with World War II. The war effort created a huge demand for lumber. It also spurred advancements in technology, setting the region up for one of the largest timber harvests in U-S history. As part of our EarthFix series exploring at the impact of the military on the environment of the Northwest, Jes Burns looks at the connections between World War II and the development of the most iconic symbol of modern logging - the chainsaw.