170 States Poised to Sign Historic Climate Deal

(UNITED NATIONS) — As many as 170 countries are expected to sign the Paris Agreement on climate change Friday as the landmark deal takes a key step toward entering into force years ahead of schedule.

U.S. Secretary of State John Kerry joins dozens of world leaders for a signing ceremony that is expected to 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.