DIPLOMATS from nearly 200 countries reached a deal Saturday to keep the Paris climate agreement alive by adopting a detailed set of rules to implement the pact.

The deal, struck after an all-night bargaining session, will ultimately require every country in the world to follow a uniform set of standards for measuring their planet-warming emissions and tracking their climate policies. And it calls on countries to step up their plans to cut emissions ahead of another round of talks in 2020.

It also calls on richer countries to be clearer about the aid they intend to offer to help poorer nations install more clean energy or build resilience against natural disasters. And it builds a process in which countries that are struggling to meet their emissions goals can get help in getting back on track.

The United States agreed to the deal despite President Trump’s vow to abandon the Paris Agreement. Diplomats and climate change activists said they hoped that fact would make it easier for the administration to change its mind and stay in the Paris Agreement, or for a future president to embrace the accord once again. The United States cannot formally withdraw from the agreement until late 2020.

Many of the attendees at this year’s United Nations climate talks — known as COP24, shorthand for their formal name — expressed disappointment at what they saw as half measures to deal with a mounting climate crisis. Greenhouse gas emissions are still rising around the world, and millions of people are facing increased risks from severe droughts, floods and wildfires.

But supporters of the deal reached Saturday said that they hoped the new rules would help build a virtuous cycle of trust and cooperation among countries, at a time when global politics seems increasingly fractured.

“Particularly given the broader geopolitical context, this is a pretty solid outcome,” said Elliot Diringer, executive vice president of the Center for Climate and Energy Solutions. “It delivers what we need to get the Paris Agreement off the ground.”

“The fundamentals are in place,” Mr. Diringer added.

Not every country got what it wanted at the meeting, which had been scheduled to end Friday. Developing nations were hoping for more robust promises on climate aid, but that issue has been postponed for future talks.

The negotiations over the Paris rule book, often dense and technical, were frequently bogged down by sharp political disputes inside the saucer-shaped convention center in Katowice, at the heart of Poland’s coal country.(SD-Agencies)