Terry Gross

Congressman John Lewis (D-Ga.) became part of the civil-rights movement while he was a teenager. From 1963 to 1966, he chaired the Student Nonviolent Coordinating Committee. And he became a close associate of the Rev. Martin Luther King Jr. Lewis has been a congressman since 1987.

Paul Eisenstein reports from the Detroit Auto Show on the state of the auto industry. Eisenstein has covered cars for over 30 years; he currently reports for the independent news service The Detroit Bureau.

Transportation expert Daniel Sperling estimates that the world's car population — which currently stands at 1 billion vehicles — is likely to double in the next 20 years. Sperling is the co-author (with Deborah Gordon) of Two Billion Cars: Driving Toward Sustainability.