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.
A leading environmentalist explains how American-style consumer capitalism harms the planet and what must be done to save the earth for future generations.
- James Gustave Speth Dean of the School of Forestry and Environmental Studies at Yale University and co-founder of the Natural Resources Defense Council.
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