New York City Taxis: Clearing the Air With Natural Gas?

In the United States, only Los Angeles is worse than New York for air quality. But air in the Big Apple could get significantly cleaner if the thousands of taxi cabs working its streets switched from gasoline to cleaner burning compressed natural gas. Getting cabbies to buy these vehicles, or convert their present ones is an expensive proposition. But, as Neal Rauch reports, a new incentive package may help the fleet to make the switch.