Terra Sapiens: The Human Chapter in the History of Earth

David Grinspoon examines choices facing humanity as we enter the Anthropocene Era, the epoch when human activities are becoming a defining characteristic of the physical nature and functioning of Earth.
Speaker Biography: David Grinspoon is the inaugural Baruch S. Blumberg NASA/LC Chair in Astrobiology.
For transcript, captions and more information, visit www.loc.gov/tod...