Tens of thousands of flights carry millions of passengers around the globe on a daily basis.

Needless to say, the environmental impact of this is fairly large–but both airlines and aircraft makers are keen to reduce that impact and lower their own costs, too.

Biofuel is the current buzzword in the airline industry, and as Reuters reports (via Navigant Research), it’s one area aircraft maker Boeing is keen to explore.

Specifically, Boeing aims to seek approval for the use of “green diesel” in jet fuel.

Green diesel is made by transforming oils and fats, made from cooking oil, plant oils and waste fats, into a “renewable diesel”.

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