Rift Over Fossil Fuels to Dominate COP28

DUBAI—World leaders gathered for climate talks in this oil-rich corner of the globe amid sharp divisions over how quickly governments need to wean their economies off fossil fuels to prevent the planet from blowing past the Paris accord’s temperature targets.

Vice President Kamala Harris was expected to join Brazilian President Luiz Inácio Lula da Silva, French President Emmanuel Macron and a host of leaders from across the Gulf region Friday at the start of a two-day summit to kick off the United Nations’ annual climate talks, known as COP28.