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Pavel Kabat, WMO Chief Scientist and Research Director, speaks about the release of WMO Greenhouse Gas Bulletin with details on annual average concentration of carbon dioxide and other greenhouse gases, during a press conference, at the European headquarters of the United Nations in Geneva, Switzerland, Thursday, Nov. 22, 2018. (Martial Trezzini/Keystone via AP)

Pavel Kabat, WMO Chief Scientist and Research Director, speaks about the release of WMO Greenhouse Gas Bulletin with details on annual average concentration of carbon dioxide and other greenhouse gases, during a press conference, at the European headquarters of the United Nations in Geneva, Switzerland, Thursday, Nov. 22, 2018. (Martial Trezzini/Keystone via AP)

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