The Better Business Bureau is going after the nuclear power industry for running ads that the bureau says “have a strong potential to mislead customers.” The Nuclear Energy Institute, a trade association, has been paying for ads in national magazines and the New York Times that tout nuclear as the “clean air energy” and claim that it doesn’t emit greenhouse gases. The bureau and enviro groups contend that uranium fuel for nuclear reactors is made using electricity from coal-powered plants, which do emit greenhouse gases. The bureau said yesterday that it will ask the Federal Trade Commission and possibly state attorneys general to investigate.