National: Some oil companies are calling for pricing mechanisms for carbon emissions and even carbon taxes after years of resisting such moves. So far, the most fervent supporters of carbon pricing are based in Europe but there are signs the movement could spread. “Carbon pricing is essential,” Hege Marie Norheim, the senior vice president of Norway’s Statoil, told the ADIPEC oil conference in Abu Dhabi last week. “The Norwegian carbon dioxide tax shows that it works. This has been quite a revelation.”…