Qantas will begin using biofuel on its Los Angeles-based aircraft in 2020.

The fuel, made by U.S.-based bio-energy company SG Preston, will consist of 50% traditional jet fuel and 50% fuel made from non-food plant oils, Qantas said.

The biofuel emits half the carbon emissions per gallon as traditional jet fuel, according to the airline.

Qantas said it will purchase 8 million gallons of jet fuel during each of the next 10 years from SG Preston.

Qantas flies daily from Los Angeles to Sydney, Brisbane and Melbourne.

A carbon-offset agreement reached a year ago by the International Civil Aviation Organization calls for a worldwide reduction in commercial aviation emissions to 50% of 2005 levels by 2050.

Airlines whose emissions rise above 2020 levels would have to purchase carbon-offset credits.

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