How much CARBON FOOTPRINT is reduced by riding a bicycle?

I ride my bicycle to, from, and around campus 5 times (days) a week which totals 30 miles per week or 120 miles per month. The math is easy: 2.5 miles there, 2.5 miles back, and 1 mile on campus. So any idea on how much foot print im reducing by not using a cab or personal car? Or even money by not buying a car and using that? Or anything else.