Hey – not only do you cut-down on the carbon emissions released through your exhaust system, but you also are getting “free” exercise.
My daughter loves to ride in the burley or carrier while I pedal. I can strap a backpack of stuff to take along on my back or put it alongside of her in the burley and we are set to go to the park or community pool to play. We live in a sleepy town w/o many businesses, so there isn't much to bike too, but I do try to bike when we can. There is little reason to drive my car a half mile to go to the park.