Eco-bus runs on taco grease

In Mexico City, a group of ecologists are wandering from taqueria to taqueria in search of waste cooking oil to fuel an old school bus for an environmental awareness tour from California to Costa Rica.

The bus, which ran on avocado oil during a week-long drive down from the U.S. border, is being used to prove that vehicles can run on recycled fuels that pollute less than gasoline as it chugs around oil refineries, factories and eateries collecting vegetable oil.

"We're running low, we have to score some oil today," said environmentalist Zak Zaidman as crew members called around the greasiest-sounding eateries in the city's phone directory.

Link to Reuters story, Link to Tucson Citizen article. (Thanks, Isaac)