I'd prefer gas taxes be much higher, with basic needs subsidized so that more of us can afford the necessities for longer. Burning fuel for the fun of it seems a reasonable luxury to disincentivize. Family travel (weddings, funerals, etc) seems far more important than business travel. Changing sports leagues so teams aren't flying all over the country, and instead playing their region until the finals, would be a healthy step, too. Increasing the price of raw materials might cut down on the cheaply-made stuff we ship all over the place at a whim (looking at you, plastics).

I've seen automobile conventions and trucks hauling trucks from the suburbs to rural areas to drive through the woods for the fun of it, and while the number of people who opt in to this is probably small, their carbon footprint seems huge. I'd rather reserve that for the very rich (a few private jets don't bother me; I get it, sometimes the really important decision-makers need to get places quickly), and reduce the number of very-rich people so that more people have their basic needs met and that we might gradually, not catastrophically, reduce our population.