announcer: from our studios in new york city, this is charlie rose. charlie: ernest tony's is here, the secretary of energy for the united states. he has been negotiating with his iranian counterpart. he's a professional -- a professor emeritus at m.i.t.. he's taught there for 40 years and led the -- led the department of physics. he served in the clinton administration's undersecretary for energy and in the white house office of science and technology policy. for all his reasons and more i'm pleased to have him at the table for the first time. there's much to talk about. we're going to talk about energy in a broader sense and what you think of where we are in terms of climate and other issues, but let me begin with nuclear talks. you have become famous forcing the two john kerry and often sitting next to foreign minister for reid who was at this table a