Finally tonight, what's behind the long struggle to reach a new international agreement on reducing greenhouse gases? Margaret Warner has our update.It's been nearly 15 years since leaders from 37 industrialized countries agreed to reduce their carbon emissions as part of the so-called Kyoto Protocol.But countries would no longer be bound to meet the requirements of the deal after December 2012, even as greenhouse gases are reaching record levels in the atmosphere.For its part, the U.S. never participated in the Kyoto treaty, after Congress refused to ratify it. House Democrats passed a cap-and-trade bill to reduce heat-trapping emissions in 2009, but it collapsed in the Senate last year.Today, international negotiators kicked off a new round of talks in Durban, South Africa, to see whether any new agreements are possible. But disagreements were apparent at the outset.For more, I'm joined by Juliet Eilperin of The Washington Post. And, Juliet, welcome back.Thanks so much.Give us a flavor of the disagreements that were immediately on view on day one of this two-week conference.Well, you can see how far apart the major countries are when you have, for example, the Canadian environment minister back in Ottawa saying that Kyoto is the past,and you had the lead European Union negotiator saying the countries are running from Kyoto and urging them to go forward along with the EU to a second commitment period. So, clearly, there's a big gulf between many of the countries here.
