Bloomberg: More Americans view the Keystone XL oil pipeline as a benefit to U.S. energy security than as an environmental risk, even as they say Canada should do more to reduce greenhouse gases in exchange for approval of the project. A Bloomberg National Poll shows support for the $5.4 billion link between Albertas oil sands and U.S. Gulf Coast refineries remains strong, with 56 percent of respondents viewing it as a chance to reduce dependence on oil imports from less reliable trading partners. That compares...