Three U.S. airlines on Wednesday warned of higher fuel costs in the third quarter due to a jump in crude prices, adding to pressures the industry faces from expensive labor contracts.
01.09.2023 - 15:25 / skift.com / United Airlines / Edward Russell / Airlines
When travelers buy an airplane ticket, they’re often made aware of the carbon emissions from their trip. Google Flights and some airlines give fliers an estimate when they check fares, and carriers like British Airways and Qantas offer customers the option to buy carbon offsets or contribute to a “climate fund” in the booking process.
These carbon disclosures are important: Global airlines have set a goal of net-zero emissions by 2050. And while the industry as a whole contributes only about 2% of the world’s carbon emissions, it’s still no small task to effectively decarbonize a carbon-heavy industry.
Planes run on fossil fuels — a lot of them. That’s why most airlines are focused on the prospect of low-emission sustainable aviation fuels, or SAF. But SAF production at the scale needed may be decades away.
To go truly “green,” carriers need to look at more than just carbon. Contrails, those fluffy clouds that trail some planes as they fly overhead, can speed up global warming. That’s no small concern given that the Earth keeps setting new heat records, with this July ranking as the hottest in the history of record keeping.
“The emerging scientific consensus is that the net impact [of] nighttime contrails are much more warming than the daytime contrails are cooling, and possibly more warming to the point where they might equal 1% of all human-induced global warming,” American Airlines Vice President of Sustainability Jill Blickstein said on a recent TD Cowen podcast episode.
Contrails typically form when an airplane flies through very cold and humid air. In those conditions, the soot and water particles in the engines’ exhaust can turn into contrails and create new cirrus clouds. These conditions more often occur at night, and in certain regions of the world, like over the North Atlantic or the southern U.S.
Not all contrails are bad for the environment. Ones that keep the Earth’s heat in, like those formed late in the day or at night, can increase planetary warming by as much as a third, researchers at George Mason University in Virginia found in a 2019 study. Alternatively, those produced in the morning can actually reduce warming by reflecting the sun’s rays back into outer space. The same study found that, at least over the U.S., only about 15% of flights produce contrails.
The consensus view is that contrails do more to warm the planet then they do to cool it. That makes them an important target for airlines as they work to reduce climate impact.
“Absolutely there is a global warming impact,” United Airlines Director of Decarbonization Rohini Sengupta said, referring to contrails. The challenge, she added, is that more needs to be known about their climate impact and how to mitigate them.
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Three U.S. airlines on Wednesday warned of higher fuel costs in the third quarter due to a jump in crude prices, adding to pressures the industry faces from expensive labor contracts.
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