Green Air Online reports on “what could be a significant breakthrough,” Boeing’s identification of “green” Diesel as a new source of sustainable aviation biofuel. Green Diesel is similar chemically to current aviation biofuels, emits “at least” 50 percent less carbon dioxide than fossil fuel over its life cycle, and could be blended directly with existing fossil-based jet fuels. Similar to petrodiesel, this fuel has some specific definitions that distinguish it from “biodiesel.” According to Advanced Biofuels USA, “Renewable Diesel, often called “green diesel” or “second generation diesel,” refers to petrodiesel-like fuels derived from biological sources that are chemically not esters and thus distinct from biodiesel. Renewable diesel is chemically the same as petrodiesel, but made of recently living biomass. “…Renewable diesel is chemically similar to petrodiesel… The term “renewable diesel” refers to all diesel fuels derived from biomass that meet the standards of ASTM D975 and are not mono-alkyl esters.” The last line makes your editor again regretful he did …