Reuters: Chancellor Angela Merkel tried to douse speculation on Saturday that a key part of her government’s efforts to cut carbon dioxide emissions had been abandoned after a plan to change car tax rules was postponed. Merkel said in a speech on Saturday in the eastern town of Zwickau that the controversial plans to change rules on car tax from 2009 to take exhaust emissions into account had only been delayed on Friday and not abandoned. “The government will obviously continue …