Who's paying the 150 scientists?
Biodiesel takes carbon from the atmosphere, turns it into a fuel, and then can use that carbon again when the fuel is burned. So it is a closed loop and therefore no increase in CO2 in the atmosphere.
Petroleum based Diesel cannot offer the same benefit.
Biodiesel can/should be produced on land with no agricultural value. i.e. "No carrots, cabbage or wheat were harmed in the making of this biodiesel!" That is surely just sound economic sense. If that isn't happening.... sack your properties and infrastructure manager.
So, who is paying the salaries of the scientists who made these claims? Is it companies who have vested interests in petroleum based fuels. Are they using scientists as the mouthpiece for their concerns, to create false concern regarding biodiesel?
Green technologies won't make it to commercialisation without sound financial numbers, and using valuable land with other production benefits isn't financially sound. Furthermore if the Green tech developers are really green? then they wouldn't be so dumb as to do something so Un-Green. Which brings us back to the question about the scientists and their salaries.