Today, the Kyoto Accords go into effect without the United States onboard. More than one hundred and forty countries have signed onto the U.N.-backed treaty, which requires cutting back on carbon dioxide emissions or "greenhouse gases."
Hear a conversation about expanding the response to global warming.
Andrew Revkin, environmental reporter with The New York Times;
Mark Hertsgaard, author of "Earth Odyssey: Around the World in Search of our Environmental Future";
Kevin Trenberth, head of the Climate Analysis Section at the National Center for Atmospheric Research;
John Walsh, Professor of Climate Change at the University of Alaska at Fairbanks.
This program aired on February 16, 2005.