WASHINGTON : US Treasury Secretary Jacob Lew expressed hope the economic sanctions aimed at stopping Iran's alleged nuclear weapons program will work, because "the alternatives are worse." Lew -- whose Treasury Department is tasked with enforcing the sanctions -- was speaking Sunday at a conference in Aspen, Colorado. "It would be the best thing for Iran and the best thing for the world if economic sanctions worked because the alternatives are worse for Iran and for the world," Lew said.