By David Stanway, Gloria Dickie and Kate Abnett DUBAI (Reuters) -The president of the COP28 climate summit on Sunday urged negotiators to work harder to find consensus on a proposed first-of-its-kind deal to phase out the world’s use of fossil fuels, as the two-week conference entered its final stage. The talks in Dubai have highlighted deep international divisions over the future role of oil, gas and coal that are complicating efforts by nearly 200 countries to hash out an agreement before the summit’s scheduled end on Dec. 12. A coalition of more than 80 countries including the United States…