Climate change denial goes back further than you think. The latest "Reality Check with John Avlon," traces how climate change denial has grown over decades despite growing scientific evidence. From a 1965 memo on LBJ's desk to Exxon's internal company memos in the 1970's, the danger has been clear. CNN's Bill Weir and former GOP Congressman Bob Inglis join Avlon for an inside look. Content Exchange

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