[paleogizmo]

Like other people have said, there is a balance to be found. There's certainly a middle ground to be found instead of "I don't like the Prius so I'm going to buy an F150." Assuming no significant externalities, the more sustainable choice is also the more inexpensive choice so that's a benefit. Choosing air travel also isn't all-or-nothing, for example traveling to Cartagena from the continental USA is much less miles and carbon emissions than Phuket. Last, air lines will adjust the frequency of their routes long term so voting with your wallet matters.