You may not be able to find a breakdown by percentage, but by all appearances, most scientists believe the earth is warming and point to slightly rising temperatures and ice melts as evidence. However, a conference of scientists last month concluded global warming never was a crisis. How do we know what is fact?

Guests:

Robert Giegengack
Professor
Department of Earth and Environmental Science
University of Pennsylvania



Jan Jarrett
President and CEO
Citizens for Pennsylvania’s Future (PennFuture)