The U.N. says a record number of more than 130 countries will sign the landmark agreement to tackle climate change at an April 22 ceremony at U.N. headquarters.

Secretary-General Ban Ki-moon is hosting the ceremony on the first day that the agreement reached in Paris in December opens for signature.

The U.N. says the signing by over 130 countries, including more than 60 world leaders, would surpass the previous record of 119 signatures on the opening day for signing an international agreement, set by the Law of the Sea treaty in 1994.

Signing is the first step. The agreement will enter into force 30 days after at least 55 countries, accounting for 55 percent of global greenhouse gas emissions, deposit their instruments of ratification or acceptance with the secretary-general.