Actually, diesel engine have been powered by coal. The compression temperatures are high enough to ignite powdered coal injected into the cylinders.
The point I am making, though is that there isn't enough used cooking oil to power the world, and coal powered electricity is likely to be used at the meeting, as well.
Somebody better crank up the Arthur Treachers fish and chip shop STAT! I do know that “dust” in the right combination is highly explosive/ingnitable.