France's Senate adopted a bill authorising the government to ratify the agreement on Wednesday after a near unanimous vote by the lower house in May, Royal told a carbon pricing forum in Paris.
Royal, who is the current chair of the United Nations climate talks COP21, said several other industrialised nations were expected to ratify the agreement by the end of the year.
The Paris climate agreement aimed at limiting global warming was reached by nearly 200 nations last December in the French capital.

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