Even in these hard times, some forward-thinking school districts like this one in S. Carolina are realizing that it's a great investment to recycle their cafeteria oil into clean-burning biodiesel. A few years ago, I helped start the Breathable Bus Coalition, which aimed to do that very thing. We no longer meet, but our website is still up and has info that may be helpful to anyone interested in this effort. Diesel exhaust contains at least 15 known carcinogens, and it's been shown that some of that exhaust gets into the cabin of the bus where the kids breathe it in. Every drop of diesel that is replaced with biodiesel is going to be an improvement for kids' health.