Cop21: firmato l’accordo di Parigi sul clima

Italy's Prime Minister Matteo Renzi signs the Paris Agreement during the United Nations High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. / AFP / JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

NEW YORK, NY - APRIL 22: U.S. Secretary of State John Kerry holds his two year-old grand daughter Isabel Dobbs-Higginson for the signing of the accord at the United Nations Signing Ceremony for the Paris Agreement climate change accord that came out of negotiations at the COP21 climate summit last December in Paris. on April 22, 2016 in New York City. At least 155 countries are expected to sign the agreement which has the goal of limiting warming to "well below" 2 degrees Celsius above preindustrial levels. The ceremony symbolically takes place on Earth Day. (Photo by Spencer Platt/Getty Images)

France's President Francois Hollande speaks with US Secretary of State John Kerry (L)at the United Nations after the Opening Ceremony of the High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)

NEW YORK, NY - APRIL 22: U.S. Secretary of State John Kerry signs the Paris Agreement For Climate Change while holding his granddaughter Isabelle Dobbs Higginson during the Paris Agreement For Climate Change Signing at United Nations on April 22, 2016 in New York City. (Photo by Jemal Countess/Getty Images)

NEW YORK, NY - APRIL 22: Canadian Prime Minister Justin Trudeau signs the accord at the United Nations Signing Ceremony for the Paris Agreement climate change accord that came out of negotiations at the COP21 climate summit last December in Paris. on April 22, 2016 in New York City. At least 155 countries are expected to sign the agreement which has the goal of limiting warming to "well below" 2 degrees Celsius above preindustrial levels. The ceremony symbolically takes place on Earth Day. (Photo by Spencer Platt/Getty Images)

UN Messenger of Peace Leonardo DiCaprio addresses the United Nations Opening Ceremony of the High-Level Event for the Signature of the Paris Agreement on Climate, in New York on April 22, 2016. / AFP / JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

President of Brazil, Dilma Rousseff signs an agreement during the high level signature ceremony for the Paris Agreement on Climate at the United Nations headquarters in New York on April 22, 2016. / AFP / JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

United Nations Special Envoy to Yemen Ismail Ould Cheikh Ahmed (R) and UN spokesman Charbel Raji attend a press conference at Kuwait's information ministery in Kuwait City on April 22, 2016. Delayed peace talks aimed at ending 13 months of conflict in Yemen resumed, a day after UN mediators finally managed to get warring sides to the table. / AFP / YASSER AL-ZAYYAT (Photo credit should read YASSER AL-ZAYYAT/AFP/Getty Images)

Canada's Prime Minister Justin Trudeau signs the Paris Agreement during the United Nations High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. / AFP / JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

Brazil's President Dilma Rousseff signs the Paris Agreement during the United Nations High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. / AFP / JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

Peru's President Ollanta Humala signs the Paris Agreement during the United Nations High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. / AFP / JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

France's President Francois Hollande (R) speaks next to France's Minister of Ecology, Sustainable Development and Energy Segolene Royal (L) at the United Nations after the Opening Ceremony of the High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. Hollande signed the Paris climate agreement, the first leader from a record 171 countries to endorse the accord on combatting global warming. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)

France's President Francois Hollande (C) arrives with United Nations Secretary-General Ban Ki-moon to attend a press conference at the United Nations after the Opening Ceremony of the High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. Hollande signed the Paris climate agreement, the first leader from a record 171 countries to endorse the accord on combatting global warming. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)

NEW YORK, NY - APRIL 22: Palestinian Authority President Mahmoud Abbas signs the accord at the United Nations Signing Ceremony for the Paris Agreement climate change accord that came out of negotiations at the COP21 climate summit last December in Paris. on April 22, 2016 in New York City. At least 155 countries are expected to sign the agreement which has the goal of limiting warming to "well below" 2 degrees Celsius above preindustrial levels. The ceremony symbolically takes place on Earth Day. (Photo by Spencer Platt/Getty Images)

NEW YORK, NY - APRIL 22: Children from around the world stand in a procession with world leaders and country delegates in the General Assembly Hall at the United Nations Signing Ceremony for the Paris Agreement climate change accord on April 22, 2016 in New York City. At least 155 countries are expected to sign the agreement which has the goal of limiting warming to "well below" 2 degrees Celsius above preindustrial levels. The ceremony symbolically takes place on Earth Day. (Photo by Spencer Platt/Getty Images)

United Nations Secretary-General Ban Ki-moon speaks next to France's President Francois Hollande during a press conference at the United Nations after the Opening Ceremony of the High-Level Event for the Signature of the Paris Agreement April 22, 2016 in New York. Hollande signed the Paris climate agreement, the first leader from a record 171 countries to endorse the accord on combatting global warming. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)

NEW YORK, NY - APRIL 22: Canadian Prime Minister Justin Trudeau speaks at a news conference while attending the United Nations Signing Ceremony for the Paris Agreement climate change accord on April 22, 2016 in New York City. At least 155 countries are expected to sign the agreement which has the goal of limiting warming to "well below" 2 degrees Celsius above preindustrial levels. The ceremony symbolically takes place on Earth Day. (Photo by Spencer Platt/Getty Images)

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