Anecdotally it seems to me that not only is most business travel wasteful, but the people who do it the most are the most wasteful (e.g. a junior dev won't make

Anecdotally it seems to me that not only is most business travel wasteful, but the people who do it the most are the most wasteful (e.g. a junior dev won't make a trip unless it's really needed where an exec won't think twice). Thus the people who fly the most use are the most thoughtless about it, and certainly at their level the cost of air travel is an insufficient reason to modify behavior. It seems like a progressive carbon tax would be good: a light load on the poor schmuck who flies with great deliberation once a year, whereas the private-jet C-exec should have to pay such an large amount in carbon tax (more than a linear function of CO2) that it causes them to actually sit up and take notice.