Answer:
As part of her thesis project in Environmental Education, Mary did some dumpster-diving into the waste stream at the student union. She discovered that the material in the compost bins was contaminated with inorganic trash. Consequently, it was being taken to the landfill and instead of being composted.
Concerned by the results of her initial research, Mary then started a marketing campaign to improve how the union informed customers what should go into the compost, landfill, and recycling bins. In addition, she urged the union to change to different packaging materials that would make separating waste less complicated for students.
Afterwards, Mary inventoried the waste containers two more times to see if there had been any change in the waste stream as a result of her efforts. In the end, she concluded that there was a lot more work to do to convince students and facility managers to adopt sustainable practices.