> ...even though a diesel engine run on veg oil is emissions free. This just isn't true. Local emissions of bio-diesel are comparable to petro-diesel. When yo

> ...even though a diesel engine run on veg oil is emissions free. This just isn't true. Local emissions of bio-diesel are comparable to petro-diesel. When you factor in that C02 is absorbed during manufacture, biodiesel is estimated to have 45%-65% lower net emissions than petro-diesel, but that ignores the fact that you just repurposed viable farmland (or in some cases rainforest) and changed its C02 profile, potentially reducing or erasing any net benefit. https://en.wikipedia.org/wiki/Environmental_impact_of_biodiesel https://en.wikipedia.org/wiki/Environmental_impact_of_biodie... Another challenge is what to do with all the waste glycerol (100kg per ton of biodiesel), since prices crashed a few years back