Jatropa Curcas isn't going to grow on water nor on rocks and glaciers of the New Zealand Southern Alps. You need land the size of countries to produce meaningful quantities because it takes at least five (5) tons of jatropha oil seeds to produce just two (2) tons of biodiesel. . . . And in a B74 you can blow two tons of fuel just taxiing and waiting in line for take off. Go figure. Not an argument, just a statement of fact, sir.