Agence France-Presse: Environment ministers from the world’s top industrial powers called Monday for more effort to halve greenhouse gas emissions by 2050, but little headway was seen in setting more immediate goals. Ministers from the Group of Eight held three days of talks here in a bid to set the tone for a summit involving the G8 leaders, which opens July 7 in the northern Japanese resort of Toyako and is expected to focus on climate change. The ministers in a statement said they hoped the …