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French President Francois Hollande, right, French Foreign Minister and president of the COP21 Laurent Fabius, second, right, United Nations climate chief Christiana Figueres and United Nations Secretary General Ban ki-Moon hold their hands up after the final conference at the COP21, the United Nations conference on climate change, in Le Bourget, north of Paris, Saturday, Dec.12, 2015. Governments have adopted a global agreement that for the first time asks all countries to reduce or rein in their greenhouse gas emissions. (AP Photo/Francois Mori)
French President Francois Hollande, right, French Foreign Minister and president of the COP21 Laurent Fabius, second, right, United Nations climate chief Christiana Figueres and United Nations Secretary General Ban ki-Moon hold their hands up after the final conference at the COP21, the United Nations conference on climate change, in Le Bourget, north of Paris, Saturday, Dec.12, 2015. Governments have adopted a global agreement that for the first time asks all countries to reduce or rein in their greenhouse gas emissions. (AP Photo/Francois Mori)

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    Landmark climate deal reached in Paris

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Landmark climate deal reached in Paris

CNN's Zain Asher talks to David Sandalow about the historic deal between 196 nations at COP21 in Paris.

Landmark climate deal reached in Paris

CNN's Zain Asher talks to David Sandalow about the historic deal between 196 nations at COP21 in Paris.