U.S. President Barack Obama and Chinese President Xi Jinping on Saturday outlined new plans for expanding their joint efforts on climate change, showcasing one of the few areas of agreement in an otherwise tense relationship between the two leaders. U.S. officials detailed the agreement reached by Messrs. Obama and Xi ahead of what is likely to be their final meeting before a new president enters the White House in January. The new steps include formal adoption by both the U.S. and China of the international climate-change agreement reached in Paris in December 2015, as well as a road map for achieving emissions reductions in commercial aircraft and for phasing out hydrofluorocarbons, or HFCs, a potent group of gases that are linked to climate change but aren’t covered by the Paris agreement. The moves cap three years of efforts by Messrs. Obama and Xi to advance climate-change initiatives, following […]