Single-stream recycling yields the highest participation, reduces worker safety hazards and delivers efficiency in the most expensive part of the recycling system: collection. Do your part to reduce the amount of trash and non-recyclables (contamination) in the recycling stream. Contamination decreases the quality and value; plus, removing and sending contaminants to the landfill adds cost. On average, contamination makes up 14 percent of incoming recycling loads in North Carolina.