Lumber supplies in the U.S. are facing a big shortage as a result of the coronavirus pandemic, presenting issues for the housing and construction market.  Several major lumber mills cut back on their production when COVID-19 arrived in the U.S. earlier this year, Millionacres reported. Mill officials cited concerns of a worsening economy and the health and safety of their employees, but didn't foresee demand rebounding as quickly as it did.  "Lumber producers both in the U.S. and Canada...curtailed operations to a great extent in March and early ...