Hi, try visiting the following sites:
http://www.biodieselnow.com/
http://www.biodiesel.org/resources/faqs/default.shtm

IN a nutshell, it is better for the environment because it is made from renewable resources (coconut) and has lower emissions compared to petroleum diesel. It is less toxic than table salt and biodegrades as fast as sugar. Since it is made from renewable resources such coconut, it will eventually decrease our dependence on foreign oil and contributes to our local economy.