Karl Feilder reckons it was a simple sell to McDonald’s Corporation, the world’s largest fast-food company. He would recycle the vegetable oil used to cook their fries, convert it and create biodiesel to serve their trucks that deliver to more than 100 fast-food outlets in the oil-rich United Arab Emirates.

It wasn’t a completely original idea. The giant burger chain had started the process in similar guises in Europe and the U.S., but the chief executive of the small privately-held business The Neutral Group thought he could offer a more tailored service in Dubai, using exclusively McDonald’s vegetable oil to power its own vans.

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