Pulitzer Prize-winning biographer Jon Meacham on the evolution of Abraham Lincoln's moral principles and political leadership -- and what the era of Lincoln can teach us about the state of our democracy today.
We talk about Al Gore’s new documentary movie and the effort to generate public interest and concern over connections between human activity and worldwide temperature trends.
- Gregg Easterbrook Author of six books, including "The Progress Paradox," contributing editor to "The Atlantic" and "The New Republic."
- Andrew Revkin Covers the environment for "The New York Times" and writes the paper's "Dot Earth" blog; author, "The North Pole Was Here: Puzzles and Perils at the Top of the World"
- Gavin Schmidt Climatologist and climate modeler, NASA's Goddard Institute for Space Studies
- James Connaughton Executive Vice President for Corporate Affairs of Public and Environmental Policy for Constellation Energy. He was former chair of the White House Council on Environmental Quality.
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