I find it just a bit ironic to see so many "Chopper"-style bikes with "banana" seats in an Earth Day celebration. In fact, it looks as though most of the seats are vinyl or plastic. I guess a vegan could argue that those are more appropriate for ED, or any other day, than leather saddles. Then again, all of the bike frames are steel, which is more environmentally friendly than aluminum or carbon fiber. Is it also better than titanium for the planet?
Of course, pretty much any bicycle, made of any material, leaves less of a carbon footprint than anything with a motor.