Agence France-Presse: The UN’s top climate scientist on Thursday urged a key conference on global warming to set tough mid-term goals and warned carbon emissions had to peak by 2015 to meet a widely-shared vision. Rajendra Pachauri, chairman of the Nobel-winning Intergovernmental Panel on Climate Change (IPCC), said the talks in Copenhagen in December must focus on 2020, a far more important target than mid-century. “Strong, urgent and effective action” is needed, Pachauri told a meeting of …