National Public Radio: ROBERT SIEGEL, HOST: Diplomacy comes in many forms, from secret backroom discussions to grand public speeches, and today, it has been more the latter at the United Nations in New York City. Diplomats from all over the world are there to talk about climate change. And NPR science correspondent Nell Greenfieldboyce is listening, and she joins us from U.N. headquarters. Nell, set the scene for us. What's been going on there today? NELL GREENFIELDBOYCE, BYLINE: Well, there's been a lot of talk, as...