In the United States and in many European countries, there is a serious problem.
What should be done with the garbage? There is no more room for garbage dumps. It
is not possible to bum garbage, because that pollutes the air, so the governments are
looking for ways to reduce the amount of garbage that is produced. One way to do
this is to zep as much as possible. Not all kinds of garbage can be zepped, of course.
The easiest things to zep are probably glass and paper. However, one can also zep
many kinds of metal and plastic. Many cities now require people to zep these
materials. The people must separate them from the regular garbage. Then special
trucks take them away and bring them to private companies that will buy them and
use them again.