Congrats. Enjoy the attention.
My employer has a lot of similar team-based sustainability promotions, but I have always been a bit skeptical about the way they tally things up. I do find that coworkers seem to like me on their teams. The fact is that I commute by bike for two reasons: 1. I enjoy it very much. and 2. I am too cheap to pay for a parking pass for a motor vehicle. My employer does offer bike commuters a limited number of free parking passes (which I rarely use). The odd thing about it though is that for before I commuted by bike, I walked to work; however they would not offer me free parking passes as a foot commuter.