Airline industry claimed science not ārobustā enough to implement new controls to combat climate warming caused by vapour trails
Airlines and airports opposed measures to combat global warming caused by jet vapour trails that evidence suggests account for more than half of the aviation industryās climate impact, new documents reveal.
The industry argued in government submissions that the science was not ārobustā enough to justify reduction targets for these non-CO2Ā emissions. Scientists say the climate impact of vapour trails, or contrails, has been known for more than two decades, with one accusing the industry of a ātypical climate denialist strategyā.
While carbon emissions from jet engines contribute to global heating, research suggests the contrails formed when water vapour and soot particles form into ice crystals have an even greater impact. These human-made clouds trap heat in the atmosphere that would otherwise escape into space.
The Intergovernmental Panel on Climate Change estimated in aĀ special reportĀ in 1999 that the historic impact of aviation on the climate was two to four times greater than from its CO2Ā emissions alone. AĀ 2020 studyĀ by the EU also reported that non-CO2Ā aircraft emissions, comprised mainly of contrails, warm the planet about twice as much as the carbon dioxide released by planes, but acknowledged there were āsignificant uncertaintiesā.
Piers Forster, professor of climate physics at Leeds University and a member of the Climate Change Committee, which advises the government on emissions targets, said: āThe industry should not hide behind uncertainty and needs to act to rapidly reduce both its CO2Ā and non-CO2Ā effects.ā
Milan Klƶwer, a climate scientist at Massachusetts Institute of Technology, said airlines were adopting a ātypical climate denialist strategyā by overstating the level of uncertainty about non-CO2Ā effects. He said: āEven in the best case, they roughly double the effect of CO2Ā emissions on the climate.ā














