Global warming and my cars

I must admit that I don't lose a whole lot of sleep regarding the size of my "carbon footprint." At the same time, though, we do try to be conscientious about not being wasteful, about recycling and composting, combining trips, being good stewards of the earth and its resources, etc. I am genuinely delighted that today we bought a "new to us" Toyota Prius. I have wanted one for a long time, and the Church had one for sale that we were able to snap up. It at least partially offsets the gas-hog nature of our Ford Excursion (that is a necessity for us when driving the whole family anywhere). People evaluating us on what we drive (if anyone is actually doing that) may consider us slightly schizophrenic.