Check out this amazing infographic, produced by carinsurance.org about the environmental power of carpooling.
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This is especially interesting to me right now because my car recently died, and we're trying to exist as a one-car family. Oh my. It is tough. The hardest part is that I only need a car a few times a week, and only for a few hours on a few days... which makes it difficult to justify replacing our gas guzzler with another gas guzzler. I'm considering just using a zipcar... but I need it for commuting, which doesn't necessarily make sense.
Do you carpool? Do you ZIPcar? What are the pro-cons?