Representatives from 192 nations are converging on Copenhagen Monday for the opening day of the two-week United Nations Climate Change Conference, where the next steps are expected to be hashed out towards an international emissions agreement.

Capturing the faces of an ever expanding and changing youth movement in China, photographer Matthew Niederhauser's ongoing project, "Sound Kapital," documents the emerging underground punk, indie rock, electronic and folk music scenes of Beijing.

Tonight on the NewsHour, Jeffrey Brown talks to Wu Man, who at age 45 is one of the world's leading musical ambassadors. She's a master of the pipa -- a four-stringed lute with ancient roots in central Asia and China.