Main Idea and Supporting Details: Practice

Passage: "Every week, well-meaning residents toss greasy pizza boxes, broken drinking glasses, and plastic bags into their blue bins. These items cannot be processed at most Canadian recycling facilities, and worse, they can contaminate an entire truckload of otherwise good material. When a load is contaminated, it is often sent straight to landfill, undoing everyone's effort. Learning a few simple rules about what belongs in the bin does more for recycling than good intentions alone." Which statement best expresses the main idea of the passage?