In his first "Urbi et Orbi" (to the city and the world) message, Francis also called for peace between Israelis and Palestinians, an end to the civil war in Syria, and political solutions to conflicts in several African countries.
The former Cardinal Jorge Bergoglio of Argentina also condemned the "iniquitous exploitation of natural resources" and urged everyone to be "guardians" of creation.
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A petition calling for Tony Blair's anti-poverty award to be taken back has gained more than 90,000 signatures.
American scientist, who was the co-discoverer of DNA, is offering his Nobel Prize medal at auction and it could sell for up to $3.5 million.