An employee operates a Komatsu Ltd. WA250 wheel loader next to a pile of mulch at the Cyblair Sawmill in West Columbia, West Virginia, U.S., on Friday, Nov. 17, 2017. Lumber prices are trading at a 13-year high amid rising demand for housing and as the threat of U.S. tariffs on softwood imports from Canada sparks supply concerns. Photographer: Ty Wright/Bloomberg via Getty Images