Governments began work Monday on a rule book to implement the 2015 Paris Agreement to limit global warming, with the United Nations urging stronger action after a string of record-smashing monthly temperatures.

The meeting of government experts is the first since 195 nations reached a deal in Paris in December to limit climate change by shifting from fossil fuels to green energies by 2100 .

Last month, the Paris Agreement was signed by 175 governments at a New York ceremony, the most ever for an opening day of a U.N. deal, and including top emitters China and the United States.

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