Took your survey, however you can not judge if cycling is a better way to commute because there are to many variables. First, most places that I ride or would like to ride have no safe bike lanes, traffic is worst during the hours that I would like to ride. Shoulder are not well maintained usually very rough and full of debris that come from the cars and trucks causing many flat tires. Just because we have bikes does not make it a better mode of transportation. Many jobs are located far from home these days and it usually takes the average ride about 1 hour if conditions are ideal to cover a 15 mile stretch. Carrying items are very difficult also which would require you to add some sort of saddle bags or panniers to carry your stuff, thus this slows you down and can be problematic while riding. Therefore I would say that for the majority of riders it is more for leisure and sport than a form of transportation, everything can not be green and as far as the globule warming aspect it is a farce and has not been proven it is a weather cycle that we go through not something that Al Gore believes is man made.