Renowned essayist, farmer, poet, and conservationist Wendell Berry says the Gulf of Mexico oil spill demonstrates that "we're putting too much at stake" in the way we go after oil and mineral resources.

Wangari Maathai became the first African woman to win the Nobel Prize for peace. She is a conservationist whose movement has caused the planting of 30 million trees in Kenya and also helped lead to free elections. Recently, Maathai visited Chicago, as Judy Valente reports.

Read more of Bob Abernethy's October 16, 2006 interview in Cambridge, Massachusetts with E.O. Wilson.