ROME (Reuters) - The leaders of the Group of 20 major economies have reached an agreement on the wording of the final communique which will be released at the end of their two-day summit, a G20 official told Reuters on Sunday. Further details were not immediately available. Diplomats have been negotiating hard-to-bridge differences on how to tackle global warming, with phasing out of fossil fuel subsidies, ending coal power and a firm date for achieving net zero carbon emissions among the main sticking points, sources said earlier on Sunday. Reporting by Jan Strupczewski and Gavin Jones, editing by Crispian Balmer