Why post this? It's not a secret.

What is more worrying is the emissions of air traffic, which is enormous.

If I remember well, a single seat in an air plane is equivalent to a single car, per unit of distance. So it's like accelerated travel, meaning if you move a person 1000 km by air, it's equivalent to riding that person 1000km with a single car. It's the same emissions per distance, except it's done between 8 and 10 times faster (not considering takeoff).

Imagine replacing a single airplane of 100 passengers with 100 cars who don't share passengers.