COP21, Paris, 2015. A giant mechanical polar bear built by Greenpeace welcomes delegates to the venue, reminding them of the importance of reaching an ambitious climate agreement.

COP21, Paris, 2015. Pillars displaying country flags line the entrance to Le Bourget

COP21, Paris, 2015. Delegates walk between the venues at Le Bourget

COP21, Paris, 2015. Intergovernmental Panel on Climate Change (IPCC) Chair Hoesung Lee, Republic of Korea, walks with members of the IPCC and UNFCCC Secretariat

COP21, Paris, 2015. Delegates participating in plenary.

COP21, Paris, 2015.

COP21, Paris, 2015. UNFCCC Executive Secretary Christiana Figueres. Photo published in The Guardian.

COP21, Paris, 2015. President François Hollande, France.

President Barack Obama, US

COP21, Paris, 2015. ADP Co-Chair Daniel Reifsnyder, US

COP21, Paris, 2015. Contact group on the Forum and Work Programme on Response Measures. Photo published in the New York Times Blog.

COP21, Paris, 2015. Trigg Talley, US, speaks with delegates in the corridors. Photo published in the New York Times Blog.

COP21, Paris, 2015. Members of the G-77/China meet informally between sessions.

COP21, Paris, 2015.

COP21, Paris, 2015. Members of civil society call to ‘kick big polluters out’ of the climate negotiations.

COP21, Paris, 2015. COP 21 President Laurent Fabius, Foreign Minister, France, holds up the Draft Paris Outcome submitted to the COP by the The Ad Hoc Working Group on the Durban Platform for Enhanced Action (ADP).

COP21, Paris, 2015. Delegates review the draft text.

COP21, Paris, 2015. A UN security guard directs a non-party delegate to one of the ADP overflow rooms

COP21, Paris, 2015. Members of civil society participate in a demonstration calling for action to support the Climate Vulnerable Forum’s declaration, full decarbonization and 100% renewable energy by 2050. Photo published on the cover of Climate Action Network (CAN) Annual Report, 2016.

COP21, Paris, 2015. Youth advocate for delegates to ‘do the right move’ to reach a climate agreement. Youth perform a dance-off, encouraging delegates to ‘do the right move’ to deal with climate change.

COP21, Paris, 2015. The draft Paris outcome is distributed to delegates.

COP21, Paris, 2015.

COP21, Paris, 2015. During the final days of the negotiations, delegates huddle in the corridors before receiving the revised draft Paris outcome. Photo published in The Guardian.

COP21, Paris, 2015. Nozipho Mxakato-Diseko and Edna Molewa, Minister of Water and Environmental Affairs, South Africa, speak with Laurence Tubiana, COP 21 Presidency. Photo published in The Guardian.

COP21, Paris, 2015

COP21, Paris, 2015. As the negotiations continue behind closed doors, hundreds of people begin to protest outside of the entrance to Le Bourget.

COP21, Paris, 2015. Hundreds of people join a large demonstration that blocks the entrance to Le Bourget, calling for a fair, transparent and ambitious climate agreement.

COP21, Paris, 2015. US Secretary of State John Kerry and UN Secretary-General Ban Ki-moon during a bilateral meeting hours before the Paris Agreement was adopted. Photo published in the New York Times Blog.

COP21, Paris, 2015. In the final hours of COP21, members of the press rush to the dais as the final session begins.

COP21, Paris, 2015. UNFCCC Executive Secretary Christiana Figueres speaks with UN Secretary-General Ban Ki-moon and the COP 21 Presidency in the final hours of negotiation.

COP21, Paris, 2015. Members of the newly-formed High Ambition Coalition enter the plenary with Tony de Brum, Minister of Foreign Affairs, Marshall Islands, and US Special Envoy for Climate Change Todd Stern. Photo published in Rolling Stone Magazine.

COP21, Paris, 2015. COP 20 President Manuel Pulgar-Vidal, Minister of Environment, Peru, is thanked for his leadership over the years.

COP21, Paris, 2015. Ambassador Nozipho Mxakato-Diseko, South Africa, and lead negotiator for the G-77/China.

COP21, Paris, 2015. Amina J. Mohammed, then Minister of the Environment, Nigeria, speaks with former US Vice President Al Gore.

COP21, Paris, 2015. Members of the Like-Minded Developing Countries (LMDCs) huddle during the final negotiations.

COP21, Paris, 2015. COP 21 President Laurent Fabius, Foreign Minister, France, thanks parties for their support.

COP21, Paris, 2015. Halldór Thorgeirsson, UNFCCC Secretariat; Laurence Tubiana, COP 21 Presidency; UNFCCC Executive Secretary Christiana Figueres; and COP 21 President Laurent Fabius, Foreign Minister, France; celebrate the adoption of the Paris Agreement.

COP21, Paris, 2015. Laurence Tubiana, COP 21 Presidency; UNFCCC Executive Secretary Christiana Figueres; UN Secretary-General Ban Ki-moon; COP 21 President Laurent Fabius, Foreign Minister, France; and President François Hollande, France, celebrate the adoption of the Paris Agreement. Photo published in The Guardian.