Officials from around the world have agreed upon a set of rules on how countries will measure and report their carbon emissions.
The rules will govern the 2015 Paris climate agreement, which becomes operational in 2020, and aims to limit global temperature rises to below two degrees.
Of the 200 nations that signed the Paris agreement, 196 agreed on the new rules which will govern how each country cuts greenhouse gas emissions.
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The rules were agreed after two weeks of United Nations talks in Poland at the COP24 climate change conference.
Last year, the US announced it woud pull out of the Paris climate pact but cannot formally do so until 2020. Until then, it still attends annual UN climate talks.
'Sake of humanity'
Scientists say emissions of gases such as carbon dioxide need to drop sharply by 2030 to prevent potentially catastrophic global warming.
Michal Kurtyka, a Polish official chairing the talks, sealed the deal on Saturday.
"We will all have to give in order to gain. We will all have to be courageous to look into the future and make yet another step for the sake of humanity," he said.
"Through this package, you have made a thousand little steps forward together."