Political agreement rather than full treaty is now goal of the meeting, says global warming ministerHopes that a full, legally binding treaty on tackling climate change would be signed at next month's Copenhagen summit are fading, Ed Miliband acknowledged today.The climate change secretary indicated that a political agreement, with a timetable setting out the path to a full international treaty, was now set to be the major goal for the meeting.He told MPs the government would have preferred a full treaty but any deal that does emerge from the talks must contain detailed commitments.African nations walked out of the latest round of UN climate change talks in Barcelona this week in a protest calling for deeper cuts in greenhouse gas ...