Pope Francis arrives in the General Assembly Hall to address the Assembly.

Pope Francis arrives in the General Assembly Hall to address the Assembly. Photo: Evan Schneider

Pope Francis addresses the General Assembly during his visit to United Nations headquarters. UN Photo/ Kim Haughton

Pope Francis addresses the General Assembly during his visit to United Nations headquarters. UN Photo/ Kim Haughton

Malala Addresses General Assembly at SDG Summit 2015 Malala Yousafzai (centre), education advocate and Co-founder of the Malala Fund, addresses the General Assembly during the opening day of the UN’s Sustainable Development Summit, taking place in New York from 25-27, September, 2015. She is joined by youth from all 193 Member States holding solar-powerd lanterns that represent the youth's hope for the future and committment to help meet the Global Goals set down in the Summit's agenda, "Transforming our world: the 2030 Agenda for Sustainable Development". UN Photo: Mark Garten

Malala Addresses General Assembly at SDG Summit 2015
Malala Yousafzai (centre), education advocate and Co-founder of the Malala Fund, addresses the General Assembly during the opening day of the UN’s Sustainable Development Summit, taking place in New York from 25-27, September, 2015. She is joined by youth from all 193 Member States holding solar-powerd lanterns that represent the youth’s hope for the future and committment to help meet the Global Goals set down in the Summit’s agenda, “Transforming our world: the 2030 Agenda for Sustainable Development”.
UN Photo: Mark Garten

Colombian Shakira performs John Lennon's Imagine at the opening ceremony.

Colombian Shakira performs John Lennon’s Imagine at the opening ceremony.

Angelique Kidjo performing the song "Africa" at the pre-opening ceremony of the Sustainable Development Summit, taking place in New York from 25-27, September, 2015. The agenda, titled "Transforming our world: the 2030 Agenda for Sustainable Development", includes 17 goals that will help to end extreme poverty, fight inequality and justice and fix climate change over the next 15 years. UN Photo/Kim Haughton

Angelique Kidjo performing the song “Africa” at the pre-opening ceremony of the Sustainable Development Summit, taking place in New York from 25-27, September, 2015. The agenda, titled “Transforming our world: the 2030 Agenda for Sustainable Development”, includes 17 goals that will help to end extreme poverty, fight inequality and justice and fix climate change over the next 15 years. UN Photo/Kim Haughton

A view of the General Assembly Hall following the adoption of the post-2015 development agenda by the UN summit convened for that purpose. Photo/Cia Pak

A view of the General Assembly Hall following the adoption of the post-2015 development agenda by the UN summit convened for that purpose. UN Photo/Cia Pak

Secretary-General Ban Ki-moon (right) meets Gordon Brown, United Nations Special Envoy for Global Education, on the sidelines of the UN Summit on Sustainable Development. UN Photo: Rick Bjornas

Secretary-General Ban Ki-moon (right) meets Gordon Brown, United Nations Special Envoy for Global Education, on the sidelines of the UN Summit on Sustainable Development. UN Photo: Rick Bjornas