Leaders from at least 175 countries were signing the Paris Agreement on climate change Friday as the landmark deal took a key step forward, potentially entering into force years ahead of schedule.
U.S. Secretary of State John Kerry, holding his young granddaughter, joined dozens of world leaders for a signing ceremony that set a record for international diplomacy: Never have so many countries signed an agreement on the first available day. States that don't sign Friday have a year to do so.
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