Single-stream recycling, which commingles all recyclables (paper, cardboard, metals, plastics, and glass) in one bin, has been the primary means of collecting recyclables in the U.S. since the early 1990’s. When glass is collected in single-stream recycling collection programs, it breaks and embeds into other materials, creating contamination and decreasing material value. This results in large amounts of collected material going to U.S. landfills.