I have written periodically on 'green diesel', which is not to be confused with biodiesel. Neste, Petrobras, and ConocoPhillips (in a venture with Tyson foods), have all entered the green diesel arena. (See a bit on announced projects from these companies here; explore previous green diesel stories I have written here).

Green diesel is produced either from hydrotreating or hydrocracking plant oils or animal fats (Neste, Petrobras, and COP) or via the BTL reaction (Choren). Green diesel is chemically different from biodiesel. Green diesel has chemical properties identical to petroleum diesel, while biodiesel is not a pure hydrocarbon (it contains oxygen atoms, hence the somewhat different physical properties).