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 - and yet doubt was sold to divide us.

CNN’s Bill Weir and former GOP Congressman Bob Inglis join Avlon for an inside look.