One in five travellers is flying less as flight shaming propels them to shun air travel for the sake of the planet, according to a survey of 6,000 Western travellers.
The survey predicted environmental concerns would keep affecting air traffic, as activists like Greta Thunberg encourage people to get off planes.
As an alternative to flying, people are choosing trains and ferry instead.
A survey of more than 6,000 respondents in July and August showed that, on average, one in five travellers in the United States, France, Britain and Germany had cut air travel by at least one flight in the past year because of climate concerns.
Commercial flying accounts for about 2% of global carbon emissions and about 12% of transport emissions, according to the Air Transport Action Group, an aviation industry group.
The survey also found that the percentage of people thinking of reducing their flying for the same reason had climbed to 27%, up from 20% in a previous survey during May 2019.