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The Paris agreement on climate change will enter into force in 30 days, after the number of countries ratifying the accord passed a key threshold.
The EU, Canada and Nepal are all expected to deposit their instruments of ratification - formally accepting the process - on Wednesday, said UN spokesman Farhan Haq.
"By the end of the day, we expect the Paris agreement on climate change to have crossed the second and final threshold needed for it to enter into force," Mr Haq said.
"The Secretary-General has been very encouraged by the tremendous positive support from a broad coalition of countries from the largest emitters to the small island developing states to bring the Paris agreement to life as soon as possible."
The deal takes effect 30 days after 55 countries, accounting for at least 55 percent of global emissions, have adopted it.
Sixty-two countries had done so as of Tuesday but they accounted only for about 52 per cent of emissions.
With the addition of Nepal, Canada and the seven EU countries that have so far ratified the deal, the countries now account for well over 55 per cent of emissions.
The Paris agreement, successor the Kyoto Protocols, aims to "stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system".
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Most crucially, its 191 signatories want to prevent the world's temperature increasing by 2C, so it is possible to "significantly reduce the risks and impacts of climate change".
Tense international relations between major carbon-emitting powers, in particular the US and China, had led to some difficulties in ratifying the deal, but the two countries agreed to it in September .
The next UN climate conference begins on 7 November in Marrakech, Morocco.
AP contributed to this report
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