New Zealand Herald: Prime Minister John Key returns home this morning from the Copenhagen climate change conference saying a binding agreement could be concluded in Mexico next year but that the negotiating process has to change. "It’s progress, but there is a lot more to be done if we are going to achieve the outcome that we need," he said last night from Los Angeles. "There is a lesson to come out of Copenhagen and that is that trying to build uniform consensus across 193 countries on such a …