[ctdonath]

Most things are probably cheaper to replace than to bring back from the most remote area on Earth, and far cheaper to leave for someone else to use than make them bring their own. If unwanted, it’s trash - too expensive to move when there’s presumably an acceptable landfill right there (may sound environmentally unfriendly, but hauling trash back is likely worse).

[mlindner]

If I remember right they're actually required to ship all trash back. There are no trash landfills in Antarctica.