They live closer by? So less miles travelled, and in many cases travelled by train? Depending on how you generate electricity that works out quite differently.

Went to Venice by night train 15 years ago, would definitely recommend.

Conversely, however, perhaps we should question Europeans massively going to Phuket.

I'm not against restricting internal tourism as well, at least the most destructive forms, such as cruises for instance.

It's not just a question of CO2 pollution, but of human ecology as well: cities like Venice, Lisbon and Barcelona are being eaten out by tourism. What made them interesting is disappearing due to the local economy being highly disrupted by the massive inflows of tourists around the world.