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Why was 2015 the hottest year ever?
Last year goes down in the history books as the world's warmest. Has the time come for science deniers to face the facts? Gavin Schmidt from NASA’s Goddard Institute of Space Studies discusses with Chris Matthews.
Climate on MSBNC
#BIGPICTURE: Ozone-destroying chemical found in the Antarctic00:52
Democratic strategist: WH doesn’t have proper vetting process10:29
Joe: How much longer can Pruitt survive at EPA?07:00
Jacob Soboroff joins NASA on a trip to Greenland05:36
Palace intrigue: Can Trump’s chief of staff and EPA head survive?07:12
WI agency bans mention of climate change06:32