Picture this. Instead of fighting through an airport to get on a flight, you check in to a facility next to a trucking yard. You get put under, trucked to the nearest railyard, and transported to the nearest port. There, you get offloaded to a cargo vessel and transported to a different continent. Reverse the process to get you awake and refreshed and maybe even time zone compensated at your destination.
No air travel, no aircraft emissions.
Doesn't sound like something I'd do, but I'd read a science fiction book that examined the implications.