A small minority of frequent flyers dominate air travel in almost all countries with high aviation emissions, analysis suggests.
In the UK, 70% of flights are made by a wealthy 15% of the population, with 57% not flying abroad at all.
There are calls for a frequent flyer levy – a tax that increases the more you fly each year.
Greenpeace supports the tax and also wants air miles banned because they say it encourages frequent flying.
The UK government said it is reviewing aviation taxes, but insisted that a small frequent flier levy would have many problems.
The campaigners believe frequent flyer levies would be broadly popular because they disproportionately affect the rich, who fly the most.