Dude, I’ll keep this really short because you are either seriously ignorant or seriously deluded. BTW: I work in finished product blending for nearly 30 years.
Ethanol is not used in bio-diesel. It is used in bio-gasoline. Rapeseed oil is used in bio-diesel. In both bio versions, only up to about 10% is “bio,” the rest comes from refined crude oil that is not “renewable” on a human scale time frame.
The emissions that come from burning these fuels lead directly to increased greenhouse gases. SOx, NOx, etc. You know the whole scandal with VW cheating on diesel emissions? That isn’t a joke.
Changing from fossil fuels will hit me right in the pocketbook. But it is still the right thing to do for the future of our species.