Better mass transit wouldn't just benefit the environment and riders, but also the buildings around town.

"I think better and greener mass transportation routes would affect real estate, because when the population wants to move to the city, they wonder how they are going to get around," says Knapp. "I think if we make mass transit easier, more people will want to work here."

Knapp was present for part of the fair and mentioned it was hard to say how many attended as people were trickling in and out throughout the afternoon. "There was a good turnout." During the evening speeches there were about 200 people, which is about 100 short according to Knapp. "The nice spring weather competed with the floor."

Knapp attended a session to learn how to put a bike on the bus. "I'm always confused on how to do that."

There were demonstrations from Philadelphia Car Share, mockups of new Septa buses and discussions of various green topics.

This month's speakers were Sam Schwartz, a transportation consultant in New York City; Steve Weber, assistant transportation commissioner in NYC; and Walter Hook, a global transportation expert. They spoke about how to revitalize Philadelphia's mass transit and make it green. Speakers also discussed NYC's congestion pricing plan and the possibility of implementing a similar plan here.

"The moniker these days is that Philadelphia was originally developed as a 'green country town,'" says Knapp. "Since the new mayor came into office in '08, he's put the environment at the front of his platform."

Knapp says Philadelphia mass transit has a "host of other problems. You can't buy tokens easily. There are no individual passes like in New York. There are only monthly and weekly passes. There are user-friendly things that need to be shaped up by the time new things start happening."