By Kate Abnett, Shadia Nasralla and Gloria Dickie SHARM EL-SHEIKH, Egypt (Reuters) -Negotiators at the COP27 climate summit in Egypt neared a breakthrough deal on Saturday for a fund to help poor countries being ravaged by the impacts of global warming, but remained locked over how to reduce the greenhouse gas emissions driving them. With a final climate accord already more than a day overdue, representatives of nearly 200 nations were anxious for an agreement they could bill as a step forward in the fight against climate change. “We have to be fast here now, but not fast towards a bad result….