Some countries already recycle it from households. I guess the US is lagging behind as it doesn't have such a big bio-diesel industry (it's not far off Europe t

Some countries already recycle it from households. I guess the US is lagging behind as it doesn't have such a big bio-diesel industry (it's not far off Europe though): https://pledgetimes.com/the-odyssey-of-recycling-cooking-oil-well-in-spain/ https://pledgetimes.com/the-odyssey-of-recycling-cooking-oil...