In energy transition state of global environmental climate  regulation control (to prevent more CO2 production by burning of fuels) by 2100,one of the best way and feasible economic analysis and environmental friendly technical approach ,we could produce and use biodiesel instead of diesel  in any diesel engines Crude Biodiesel & Crude Bio-Glycerin Production by Used Cooking Oil (UCO) of restaurants,ketrings,....instead od non-renewable feedstock (crude oil) in which is normaly used in Oil Refineries.