Conversation so far:
What are some of the green building practices?
In 1990, the Mart Center began using Green Seal-approved green cleaning products and the next year implemented a recycling program.
What did the recycling program include?
all forms of paper products, glass, light bulbs, batteries, aluminum and construction materials.

Question: How was the recycling program ran?
Self-contained rewrite: How was the recycling program of the Mart Center ran?