U.S. aircraft maker Boeing Co. aims to seek approval from regulators around the world to use "green diesel" as a jet fuel, the company said, which could cut carbon emissions without boosting costs. Green diesel is made from oils and fats such as used cooking oil, plant oils or waste animal fats in a process that uses hydrogen to break big molecules into smaller ones. It is also known as "renewable diesel" and can be used in any diesel engine. It differs from biodiesel, however, which is produced by a chemical reaction between vegetable oil and alcohol.
http://in.reuters.com/article/2014/01/14/boeing-biofuel-idINL6N0KO2NU20140114