Reuters: California’s new low-carbon fuel rules may be a violation of NAFTA and World Trade Organization provisions because they would unfairly limit exports of crude from Canada’s oil sands to the state, a prominent Canadian trade lawyer said on Friday. California adopted a first-ever rule on Thursday requiring refineries, producers and importers of motor fuels sold in the state to reduce the “carbon intensity” of their products by 10 percent by 2020, with greater cuts thereafter. The …