Hybrid cabs, now all the rage in New York City and San Francisco, as well as in Vancouver, are paying for themselves in fuel savings alone, according to the cabbie who picked me up the other day. He estimated that he was saving $20 per shift (times two shifts a day) on gas, more than enough to pay for the car over its three-year lifespan.

Grist has written about this before, but good ideas bear repeating.