British Columbia is sharply increasing the cost of trees for lumber producers just as wood-product prices slump and Canadian sawmills expand in the U.S.  Lumber producers will pay C$94.54 ($76.22) per cubic meter of coniferous saw log from the province’s interior in the third quarter, a 74% jump from this quarter and more than triple what they paid a year ago, according to a government website.  The forest-rich Canadian province’s tree prices decrease the ability of lumber producers to compete against sawmills in the U.S ...