NYT: The San Francisco Bay area, long a center of cycling aficionados and Zipcar enthusiasts, is about to play host to a $7 million pilot bike-sharing program that will blend the two popular commuting alternatives. The largest pollution-control agency in the San Francisco Bay area is joining forces with several local jurisdictions and transportation agencies to pay for the program, whose aim is to reduce some of the tailpipe emissions that are responsible for more than half of the air pollution in…