Carpooling is definitely a good habit, that will grow even more each day: it's part of what people call the "sharing economy" and it's becoming more and more important all over the world.
When we looked at the "carpooling state" in Portugal, we noticed that it was not really developed, not because of the people's will... but because there was no good enough website to push people organizing their trips together: the actual economical crisis made us move forward, convinced that "yes, we can".