And today is Bike to Work Day. On Thursday, bicycle activists in San Francisco held a rally ahead of the occasion. Leah Shahum of the San Francisco Bicycle Coalition addressed a rally on the steps of City Hall.

Leah Shahum: “We have grave challenges facing us individually and as a society, everything from the shrinking oil supply and rising gas prices to rising sea levels through global warming, to rising obesity rates. These are big challenges, and they’re a little overwhelming. Bicycling is booming today, because the bicycle is an elegant and, I think, a particularly joyful solution to so many of these challenges.”