Today's New York Times has this excellent piece about an initiative by the authorities in Westchester County, New York, to collect used frying oil and process it into biodiesel: http://www.nytimes.com/2009/02/08/nyregion/westchester/08greasewe.html?partner=permalink&exprod=permalink Under normal circumstances, in the USA, restaurants have to pay to get rid of used cooking oil. Under this new system, the county collects it free and uses it to drive several of its vehicles.
While I always think of parrallels to SOuth Asia, in India, at least, the oil would go down the drain to happily pollute ground water. Unfortunately, that doesn't drive the soot-belching Indian buses or trucks. Maybe there is a lesson to be learned here - but is India ready to learn it? I have my doubts.