I suppose the question is better phrased as "would you give it up?". Anybody who says "I can't give it up" will probably change their mind if the tickets cost 1

I suppose the question is better phrased as "would you give it up?". Anybody who says "I can't give it up" will probably change their mind if the tickets cost 10x more. I live over 18000 km (well over 10k miles) away from my home town, and I like to visit my family from time to time, and 25+ hours of air travel is bad enough as it is so traveling by ship is out of question. So I probably wouldn't give up flying altogether, as long as the price isn't too high. However, I'd be willing to refrain from taking domestic flights (but then I normally use the trains anyway) and cut down on non-essential international travel. Ultimately, the main factor in changing people's habits will be economic e.g. via a tax that captures the negative externalities.