I wouldn't get too excited about biodiesel if I were you. Currently most technologies are making biodiesel from food. That in itself is a bit startling in a country like Zimbabwe where people are already going hungry but there are other problems. To grow crops requires fertilizer and to make fertilizer requires lots of energy and chemical feed stock , the source of those being ever expensive and scarce fossil fuels. Most experts calculate that to produce 1 barrel equivalent of biodiesel requires at least 1 barrel of fossil fuel crude oil. There are also concerns about the long term effects of increasing crop yields: soil degredation, pressure on water resources and pollution. If Zimbabwe is to gain from biodiesel it needs to use a technology that uses materials that are currently waste or crops that can be grown sustainably with very low chemical fertilizer inputs. It might make sense for large agribusinesses in the US to turn surplus food into biodiesel as it pushes up the price of food worldwide and creates increased demand for their produce. I suppose this proposal could make a few people rich but I can't see it helping the poor. To the contrary I see it increasing their impoverishment.