So I did a little research and found that a gallon of gas expended to drive a car releases about 25 pounds of CO2. As it happens, I need about a gallon of gas for my round trip commute when I drive.
Then I learned that the value of a carbon offset ranges from $1 to $30 per ton of CO2. So, with a little math, I figured - at the high end - that each of my bike commuting trips should net me about $0.375. So, if I ride every work day in a month (approx 20), that should get me $7.50 per month.
Anyone want to buy some carbon offsets?
Yes, I rode today!
Ride On!! 
