In 1997, representatives from around the world met to create the Kyoto Protocol on greenhouse gas emissions. Though many nations signed on to the Kyoto accord, the United States did not ratify the treaty. This week, representatives met in Montreal, to talk about what happens next, setting targets for on beyond the 2012 guidelines set out in the Kyoto agreement. In this hour, we'll get an update on the meeting. Will it produce a more successful agreement on climate change policy?

A plume of material streams from the side of Enceladus, one of Saturn's icy moons. (Image courtesy Cassini imaging team)

We'll also check in with scientists monitoring the Cassini mission to Saturn. This week, the Cassini team released some startling images of Saturn's moons, including one of the moon Enceladus that indicates the icy moon is still geologically active inside. We'll talk about what the Cassini researchers are learning.

And finally, a guide to the winter night sky, from planets to the Geminid meteor shower. Call in with your questions and comments at 1-800-989-8255 (2-3 Eastern). Teachers, find more information about using Science Friday as a classroom resource in the Kids' Connection.

Guests:
Eileen Claussen
President, Pew Center on Global Climate Change
Washington, DC

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Bonnie Buratti
Co-Investigator, Cassini Science Team
NASA's Jet Propulsion Laboratory
Pasedena, California

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Derrick Pitts
Chief Astronomer
Planetarium Programs Director
Franklin Institute Science Museum
Philadelphia, Pennsylvania

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This segment produced by Charles Bergquist