Climate Change Deal Signed
Amid hope and hype, delegates have finished signing the Paris climate agreement at UN headquarters in New York.
Some 175 countries signed the deal on Friday, a record number for a new international treaty.
About 15 nations, mainly small island states, had already ratified the agreement.
But dozens of other countries were required to take this second step before the pact came into force.
UN secretary-general Ban Ki-Moon said: the agreement will shape the lives of all future generations, a profound way as the planet was experiencing record temperatures
As the world marked the 46th earth day, UN climate chief Christiana Figueres said most countries, need to take the signed document and go back home and through ratification procedures that in most countries requires parliamentary discussion and decision.