Carbon offsetting is just another form of greenwashing
A proper carbon tax would only increase flight costs by about 8%, since there's lots of other costs than fuel.People don't seem to believe that though. Because a carbon tax high enough to make your flight cast 8% more, would totally destroy the fossil fuel industry, as everyone would suddenly have a financial incentive to burn less of it, and there's alternatives for almost all uses. And so, a measure that would kill the fossil fuel industry, and not really bother any other industry, is portrayed as an impossible dream because the fossil fuel industry has a lot of money and power.