The exhibition "Then and Now" at the David Brower Center in Berkeley features work by acclaimed photographer Sebastião Salgado. Salgado is known for images that reveal the human condition - from laborers in Latin America to refugees from war and famine in Africa and elsewhere. In the tradition of social documentary photography, he often makes his work available to social change organizations, such as Doctors without Borders, Amnesty International, and UNICEF. Produced by SPARK for This Week in Northern California.

WEB VIDEO EXTRA: Ken Light discusses Sebastião Salgado's work

Ken Light, the director of UCB's Center for Photography, talks in detail about three of Sebastião Salgados photographs from the "Then and Now" exhibition at the David Brower Center, which runs May 14, 2009 through January 31, 2010. Produced by SPARK for This Week in Northern California.