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Since we're talking to you about the central player in all of this, who is of course hamid karzai, our ally, the president of afghanistan. and so much of the conversation has swirled around the issue of is he trustworthy, is he somebody we can deal with. you've spent hours with him. in fact, there was a very important moment where the administration asked you to be effectively the principal negotiator for the united states on some very tense issues. how do you find him? >> i find him to be a very interesting person with a certain skill set. and like anybody in public life, myself included, we ...

That miss with super-heated air. that creates the big flame plume you see. what the mixture is right, when it is done right it burns efficiently and the primary products come off this thing are carbon dioxide and water in the form of steam. shannon: mike, we've already heard some complaints. is there a downside to this technology? >> reporter: there are a lot of down sides. the primary, first one that you're producing a lot of carbon monoxide. i don't want to get into whole global warming argument but carbon dioxide is villain in global warming. crude oil is rotten, prehistoric gunk. you will ...