Environmental Impacts of Biodiesel
Biodiesel is renewable; it does not increase the amount of carbon in our atmosphere while using existing infrastructure.
The NSW Roads and Traffic Authority (RTA) and Newcastle council did a study on the emissions from premium diesel or B20 (20% biodiesel 80% fossil diesel) in 2004 (Adobe Acrobat required): Newcastle City Council / RTA Biodiesel Trial Emissions Testing Program
A summary of reports on the macroeconomic and environmental effect of biodiesel as experienced in Europe (requires Adobe Acrobat): Macroeconomic + Environmental Effectshttp://www.grownfuel.com/pdf/Macroeconomic%20Effect%20-%20ABI.pdf
A typical graph of the emissions from Rapeseed Methyl Ester (biodiesel) as opposed to fossil diesel: