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In an encouraging sign for sustainability – because what is more sustainable than waste – United Airlines is operating its LAX-San Francisco flights using 30% biofuel – made from animal poo. The carrier has signed a deal with Fulcrum BioEnergy for 15m gallons of biofuel over the next three years, with an option for more. And, it has made a $30m equity investment in the company.

While this is good news for airlines, today also brought delays for a sustainable aviation future. The solar-powered aircraft that has been attempting to fly around the world will not be able to take off again until next year, after the recent, and longest leg across the Pacific to Hawaii, burned out the battery.

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