World leaders meet at United Nations Climate Change Conference in Paris

French President Francois Hollande talks with India's Prime Minister Narendra Modi at the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30. (Source: AP)

Prime Minister Narendra Modi shakes hands with his Pakistani counterpart Nawaz Sharif in Paris on the sidelines of CoP 21 summit on climate change on Monday. (Source: PTI)

Japan's Prime Minister Shinzo Abe sits at the opening ceremony of the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30. (Source: AP)

Brazil's Dilma Rousseff, left, shakes hands with India's Prime Minister Narendra Modi as they arrive to pose for a group photo as part of the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30. More than 150 world leaders are meeting under heightened security, for the 21st Session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (COP21/CMP11), also known as "Paris 2015" from November 30 to December 11. (Source: AP)

Prime Minister Narendra Modi and US President Barack Obama in a meeting during CoP 21, UN Climate Change Conference in Paris on Monday. (Source: PTI)

Narendra Modi is received on his arrival at Charles de Gaulle Airport in Paris on Sunday (November 30). (Source: PTI)

Narendra Modi upon his arrival at Charles de Gaulle Airport in Paris on Sunday. (Source: PTI)

French President Francois Hollande, left, greets India's Prime Minister Narendra Modi as he arrives for the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30. (Source: AP)

French President Francois Hollande, left, greets Japan's Prime Minister Shinzo Abe as he arrives for the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30. (Source: AP)

French President Francois Hollande, left, greets Belgium's Prime Minister Charles Michel as he arrives for the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30. (Source: AP)

French President Francois Hollande, left, gestures towards French Foreign Minister Laurent Fabius while United Nations Secretary General Ban Ki-moon listens during the opening ceremony of the COP21 in Le Bourget, outside Paris, Monday, November 30. (Source: AP)

Narendra Modi and his Japanese counterpart Shinzo Abe shake hands during a meeting in Paris on the sidelines of CoP 21 summit on climate change on Monday. (Source: PTI)

Narendra Modi and with his Pakistani counterpart Nawaz Sharif talk in Paris on the sidelines of CoP 21 summit on climate change on Monday. (Source: PTI)

Greece's Prime Minister Alexis Tsipras, right, waves as he arrives for the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30, 2015. (Source: AP)

French President Francois Hollande delivers his speech at the opening ceremony of the COP21 summit, in Le Bourget, outside Paris, Monday. (Source: AP)

U.S President Barack Obama smiles as he attends the opening ceremony of the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, on Monday. (Source: AP)

U.S President Barack Obama, center, and U.S. Secretary of State John Kerry, right, attend the opening ceremony of the COP21 summit in Le Bourget on Monday. (Source: AP)

French President Francois Hollande, second right, greets India's Prime Minister Narendra Modi as he arrives for the COP21, United Nations Climate Change Conference on Monday. (Source: AP)

French President Francois Hollande, left, greets Dutch Prime Minister Mark Rutte as he arrives for the COP21 summit in Le Bourget, outside Paris. (Source: AP)

French President Francois Hollande, left, greets Italy's Prime Minister Matteo Renzi as he arrives for the COP21 summit in Paris. (Source: AP)

Greek Prime Minister Alexis Tsipras atends the opening ceremony of the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, November 30, 2015. (Source: AP)

Prime Minister Narendra Modi upon his arrival at Charles de Gaulle Airport in Paris on Sunday (November 29). (Source: PTI)