What are greenhouse gases and what do they do?
For answers, AMS-certified meteorologist Greg Fishel visits with Dr. Kevin Trenberth, a climate scientist at the National Center for Atmospheric Research who examines air samples from NOAA's Earth Systems Research Laboratory in Boulder, Colorado.
Robert Henson, meteorologist and author, joins to talk about how discussions of "global warming" have become "climate change".
Dr. Pieter Tans, climate scientist, adds insight on greenhouses gases and the earth's infrared radiation.
University of Alabama at Huntsville's climate scientist Dr. John Christy talks about his data and research on climate change.
