The Canadian dollar weakened against the greenback on Wednesday, and the yield on benchmark government debt climbed. The loonie was trading 0.2% lower at C$1.3519 to the greenback, or 73.97 U.S. cents, after trading in a range of 1.3481 to 1.353. Canadian government 10-year bond yields rose 6.7 basis points to 3.429%. The yield on similar U.S. government benchmark debt rose to 4.1095%. U.S. February crude futures fell $1.61 to $70.79 a barrel on Wednesday.