Hybrid cars are much larger than bikes. 14,000 pounds of carbon are produced in the production of each vehicle.
Most hybrids require large batteries such as nickel metal hydride batteries which are known carcinogens, and have been shown to cause a variety of teratogenic effects. Also, nickel mining is often done in open cast mines with all the attendant pollution that goes along with excavating large holes in the ground.
Hybrids do use some gas to run, while bikes require none.
When you rely on a car for transportation, you are more likely to go further for errands and not rely on completely carbon free forms of transportation such as walking and bicycling. You support your local businesses when you get there by bike or walking.