There is money to be made in dirty businesses.  Garbage collection is very profitable as recycling efforts increase.  These businesses are needed and will be increasing in demand as the population grows.  There is money in garbage.  The land fills are filling up and being converted to golf courses.  If you can over look the smell and get your hands dirty garbage businesses do quite well.  If you look at other dirty businesses like septic tanks and sewer treatment. The  investor Luke Weil will be quick to point out that these businesses are very competitive. Just consider the fact that garbage will always be needed to be hauled away.