Reuters: Major economies tried on Tuesday to break the deadlock between rich and poor nations over 2050 goals for cuts in greenhouse gas emissions at a last-minute meeting before an expanded G8 summit in Italy. Ministers or senior officials from the 17-member Major Economies Forum (MEF) met in Rome to try to agree a declaration for leaders that could be a building block for a new U.N. climate pact due to be agreed in Copenhagen in December. "We want to prepare in the best way possible …