GLASGOW—More than 190 nations attained a deal at the United Nations summit in this article that aims to speed up greenhouse gasoline emissions cuts throughout the earth, but leaves deep thoughts more than how governments will observe via in the coming 10 years to attempt to avert the worst consequences of world warming.

Supporters say the deal—struck Saturday evening soon after two months of negotiations—signals new dedication amid the world’s governments to shift absent from burning fossil fuels, the key supply of greenhouse gases that scientists say are triggering the earth to heat. The agreement, even though, functions weaknesses that have hamstrung U.N. local climate talks more than the a long time.