Two things I'm passionate about: music and environmentalism. Tonight at the Academy of Natural Science, these two worlds collide for a rockin' presentation sponsored by the Urban Sustainability Forum starting at 6:30pm. Talking Head's David Byrne will be speaking about his recent book, Bicycle Diaries, which chronicles his travels and bike adventures from city to city around the world. Now for the bad news. The event is sold out. BUT, hopefully, they will upload the video to their site...

Other speakers on tonight's lineup are: Katherine Gajewski, Director of Sustainability for the City of Philadelphia; Ignacio F. Bunster-Ossa, lanscape architect and Principal with Wallace, Roberts & Todd; and Alex Doty, Executive Director of the Bicycle Coalition of Greater Philadelphia.