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Sure, we all like to imagine the day when the whole world can drive ultra-clean cars, but all our hybrids and biodiesel trucks and solar-powered Priuses won't make a lick of difference in the fight to stop or slow global warming, says Ed Mazria, founder of Architecture 2030.

We know all about biodiesel homebrewers running to the local Chinese restaurant or fast food joint and collecting buckets of used fryer oil. Thousands of people run their cars on this waste product and in some areas – Kalamazoo, Michigan, for example – there is a unified collection system to run city buses on biodiesel. So, why not a national, coordinated waste grease collection system?