How do you deal with the trash on the Moon? This is not an exciting or glamorous subject I know, but it is part of the reality of space travel. This is something that's easy to forget about, how much trash astronauts generate every year. We don't notice it so much on the ISS because it is easy for the astronauts to dump it, and it all burns up cleanly in the atmosphere. The Apollo crew didn't spend enough time on the Moon for it to be that noticeable. Also there is nothing else nearby to get contaminated by trash in the ISS, but on the Moon then you want to study the geology of the area around your base, and there may also be ices close by if you are at the poles near one of the craters of eternal night. You may be surprised at how much trash the ISS generates. We may have humans back on the moon as soon as a decade from now so it's probably not too soon to start thinking about this in earnest.