Agence France-Presse: Chancellor Angela Merkel issued a contentious call Sunday to slow Germany’s planned phase-out of nuclear energy, amid growing fears it will be impossible to slash greenhouse gas emissions without it. Germany plans to mothball the last of its 17 nuclear power plants, which emit no carbon dioxide and produce a quarter of the country’s electricity, by 2020 under a plan approved under Merkel’s predecessor Gerhard Schroeder. But soaring energy costs and pressure to slash CO2 …