The bark beetle has been a headache for Andreas Voss, chief wood marketer of Germany's most populous federal state, North Rhine-Westphalia, but recently things turned for the better. An infestation of the pest in the state's spruce forests has created unsalable volumes of lumber until China emerged as a buyer.  North Rhine-Westphalia spruce forests have been hit by a double whammy over the last three years -- unseasonably dry weather interspersed with fierce storms that created the perfect breeding grounds for the bark beetle. Since 2018, 21 million cubic meters of spruce trees ...