Green City seeks to convert waste liabilities into energy assets by replacing the chemicals used in the production of biodiesel with its own ultra-efficient, proprietary enzyme technology. The companys enzymatic catalyst and tailored processors produce high-quality biodiesel that meets all international specifications regardless of the feedstock or the amount of free fatty acid content. Green Citys process is fast and inexpensive, and has fewer steps than the average first-generation biofuel plant. Green City became a subsidiary company of Rafael Advanced Defense Systems Ltd in 2013.