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Qantas will pledge to cut its net carbon emissions to zero by 2050, breaking ranks with its global airline peers at a time when aviation is under unprecedented scrutiny over its contribution to climate change.

The Australian carrier will on Monday become the second airline group in the world to make a zero net emissions commitment, which it plans to achieve through fuel efficiency and the use of carbon offset schemes.

Qantas' goals go beyond its previous pledge to cut emissions to half their 2005 level by 2050, which is in line with most other airlines and their global industry body.

Qantas chief executive Alan Joyce said the goals would result in the airline group, including budget arm Jetstar, capping net emissions at their current level of about 12 million tonnes from next year and then cut it gradually over the next 30 years.

"It won’t be a straight line to zero simply because the progress on biofuel and other technology won’t be linear, either. But there will be clear progress," Mr Joyce said. "We picked 2050 because it’s ambitious but we think it’s achievable."

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